Full opinion text
OPINION WILLIAMS, District Judge: Appellants Willie James Rhynes ("W. Rhynes”), his son Michael Sevane Rhynes (“M. Rhynes”), Theodore Adams (“T. Adams”), Purvis H. Gormley (“Gormley”), John Wayne White (“White”), Lester McCoy (“McCoy”), and Alexander Adams (“A. Adams”) appeal their convictions. Appellants in this case raise numerous issues, which will be addressed in turn. For the reasons that will follow, we affirm the judgments of the district court, except that we withhold judgment for thirty days on the convictions of W. Rhynes, A. Adams, and T. Adams on Count I, as more fully explained below. I. Defendants were accused of being members of a large scale drug conspiracy, which had begun in Charlotte, North Carolina, and had existed over twenty-five years. W. Rhynes was accused of being the leader of the conspiracy. Defendants were charged with conspiracy to possess with intent to distribute cocaine, cocaine base, heroin, and marijuana in violation of 21 U.S.C. § 846. W. Rhynes was also charged with possession of a firearm by a convicted felon in violation of 18 U.S.C. § 922(g)(1). T. Adams, W. Rhynes, M. Rhynes, and Gormley were also charged with conspiracy to commit money laundering in violation of 18 U.S.C. §§ 371 and 1956(h). Prior to trial, W. Rhynes moved to suppress evidence seized from his residence and businesses, arguing that the search warrants upon which the items were seized contained stale information. United States Magistrate Judge Carl Horn denied that motion, and the district court adopted that decision. During the three-week trial in the United States District Court for the Western District of North Carolina at Charlotte, the United States of America (“Government”) presented over twenty witnesses who were alleged to be conspirators or participants in the drug trade of defendants. The Government also presented eight law enforcement officers, large quantities of drug paraphernalia, and a package containing heroin and cocaine. This package, which was seized from the United States Express Mail Service, bore the label of S & S Food Mart, but had the address of, and was delivered to, the Clifford Place Big Apple Store. Defendants also called numerous witnesses. One of the witnesses for defendant M. Rhynes was Corwin Alexander (“Alexander”). During the course of Alexander’s testimony, it became clear that he had been informed of previous testimony in the case. Counsel for defendant M. Rhynes admitted that he had questioned Alexander about some of the prior testimony in order to determine whether he would exercise his rights under the Fifth Amendment to the United States Constitution if he took the stand. The district court ruled that its sequestration order had been violated, and struck Alexander’s testimony. At the end of the trial, the jury deliberated for two days and found all of the defendants guilty of the conspiracy to traffic in controlled substances. T. Adams was convicted of conspiracy to commit money laundering, while W. Rhynes, M. Rhynes, and Gormley were acquitted of that charge. Forfeiture judgments in the amount of $1,000,000 were returned against M. Rhynes and W. Rhynes following the guilt phase of the trial pursuant to 21 U.S.C. §§ 853 and 982. Defendants all filed motions for judgments of acquittal and for new trials. While these motions for new trials were still pending, the Government learned that one of its witnesses might have gained information about the trial during the trial in violation of the sequestration order. The Government contacted the trial judge, Judge Charles H. Haden II, and briefly discussed the problem with him. Defense counsel were not privy to this conversation. Six days after the Government learned of the allegation, the Government sent a letter to the court and defense counsel detailing the investigation that it had conducted into the matter. A hearing on the motions was held. Judge Haden recused himself at this hearing because he had become a material witness. Chief Judge Richard L. Voo-rhees assumed jurisdiction over the case. After an evidentiary hearing, the district court found that the ex parte communication was not made at a critical stage of the proceedings, and that defendants were not prejudiced by the conversation. Therefore, the district court denied defendants’ motions for new trials. The district court gave all of defendants managerial role enhancements when he sentenced them. W. Rhynes and T. Adams were sentenced to life terms. M. Rhynes and A. Adams were sentenced to terms of 360 months. Gormley and White were sentenced to terms of 292 months, and McCoy was sentenced to a term of 262 months. II. Appellants first argue that the district court erred in denying their motions for new trials based on the fact that the Government had a brief ex parte communication with the district court concerning an allegation that arose after trial that one of the Government’s witnesses might have violated the district court’s sequestration order. We find that the trial court was within its discretion in denying the motions for new trials. The allegation came to light nearly two weeks after the close of trial, on October 25, 1996. On that date, Assistant United States Attorney (“AUSA”) Robert J. Hid-gon (“Hidgon”) received notification that Carlos Adams (“C. Adams”) had accused one of the trial witnesses, later identified as Andy Stinson (“Stinson”), of violating the court’s sequestration order by paying a woman to observe and report the daily activities of the trial. Joint Appendix at 2016. C. Adams also alleged that other witnesses had structured their testimony to be consistent with prior testimony. See J.A. at 2017. Higdon contacted IRS Special Agent Floyd Mitchell (“Mitchell”), who had been the lead investigator in this case, and directed him to investigate the allegations. Id On October 28, 1996, AUSA Hidgon spoke over the telephone to Judge Haden, with AUSA Gretchen Shappert (“Shap-pert”) and Mitchell present in Hidgon’s office. Hidgon advised Judge Haden of the situation. J.A. at 2017, 2363-65. Mitchell conducted his investigation of the event, speaking to the four individuals mentioned by C. Adams. These individuals, Gary Cannon (“Cannon”), Stinson, Tim Perry (“Perry”), and Scott Lattimore denied all of C. Adams’ allegations. See J.A. at 2036-46. In a letter dated October 31, 1996, AUSA Higdon detailed the results of Special Agent Mitchell’s interviews and included copies of Mitchell’s reports. See J.A. at 1967-70. Defense counsel learned about C. Adams’ allegations through this letter. Following the receipt of the letter, many of appellants filed new motions for new trials. Judge Haden recused himself pursuant to 28 U.S.C. § 455(b)(1) .due to his personal knowledge of evidentiary facts placed in dispute by the appellants’ motions. Judge Voorhees acquired jurisdiction over the trial. The district court then held a two-day evidentiary hearing on the matter. Prior to the hearing, Judge Haden testified via a telephone conference call. He testified that the telephone call between him and the Government was two to three minutes in duration. J.A. at 2364. He stated: “I don’t recall that we had any substantive conversation about any action that the government would take after— you know, after I was informed of what the problem was, I just said let’s — you know, let’s notify the defense and we’ll take it from there.” J.A. at 2363. At the evidentiary hearing, C. Adams testified that he had visited with a police officer to discuss a unrelated matter on October 11, 1996. J.A. at 2411. He stated that Cannon asked him if he had been talking to AUSA Shappert. According to C. Adams, when he said no, Cannon walked away. Id Later, he testified, Stin-son approached him and asked him the same question. C. Adams testified Stinson told him he knew it was not Shappert because she was still in trial. J.A. at 2412. C. Adams asserted that he told Stinson that he had been informed that the jury was deliberating. C. Adams testified that Stinson then stated that he paid a woman to sit in the courtroom and report the daily events. Id C. Adams contended that Stin-son made a call to confirm that the jury was deliberating. C. Adams also testified that he saw Stin-son whispering and talking with others about the instant case. J.A. at 2426-29. He admitted, however, that he did not overhear these conversations, and that he did not know specifically what had been discussed. J.A. at 2426-29, 2439. Appellants tried to establish that C. Adams had been truthful in his role as a confidential source for the police. J.A. at 2386-88, 2396-97, 2407-08. Appellants also tried to bolster his claims by producing visitation records and phone records, which indicated that Stinson had made a large number of calls to certain women. J.A. 2487-96, 2496-01, 2517. Appellants also presented the testimony of their own private investigator, who asserted that he had spoken to many of the women who had been in contact with Stinson. See J.A. at 2512-22. After the hearing, the district court denied the motions for new trials. The district court found “that this brief post-trial conversation between the Government and Judge Haden was not ‘a critical stage of the proceedings.’ ” Supplemental Appendix Vol. 1 (“S.A. 1”) at 8 (citing United States v. Cronic, 466 U.S. 648, 659, 104 S.Ct. 2039, 80 L.Ed.2d 657 (1984)). The district court also found that the alleged violation of the sequestration order was not material, and any evidence of it would be merely cumulative or impeaching evidence. S.A. 1 at 12-13. Appellants now argue that the ex parte communication between the court and the prosecution about C. Adams’ allegations deprived the defense of timely notice of the violation of the Court’s sequestration order; any meaningful opportunity to contest the government’s decision to unilaterally investigate its own witness’ violation of the Court’s order on behalf of the Court; and any opportunity to participate or provide input into the investigation of a sequestration order that the Court deemed so important that it had previously removed defense witness Corwin Alexander from the witness stand upon finding an apparent violation. Brief for Appellants at 13-14. Appellants also argue that they were deprived of the assistance of counsel at a “critical stage” of the proceedings in violation of the Sixth Amendment to the Constitution of the United States. See Cronic, 466 U.S. at 659, 104 S.Ct. 2039 (“The presumption that counsel’s assistance is essential requires us to conclude that a trial is unfair if the accused is denied counsel at a critical stage of his trial.”). Appellants argue that the district court erred by holding that the contact did not occur during a critical stage of the proceedings. As motions for new trials were pending during the time that the ex parte communication occurred, they maintain that counsel for defendants should have been present. See Williams v. Turpin, 87 F.3d 1204, 1210 (11th Cir.1996); Menefield v. Borg et al., 881 F.2d 696, 698-99 (9th Cir.1989). Appellants maintain that the ex parte communication also violated their due process rights under the Fifth Amendment to the Constitution. Further, they claim that the fundamental fairness of the trial was damaged, because the ex parte communication tarnished the appearance of impartiality of the trial. Appellants rely primarily on three cases from the Sixth, Third, and First Circuits, United States v. Minsky, 963 F.2d 870 (6th Cir.1992), Yohn v. Love et al., 76 F.3d 508 (3d Cir.1996), and Haller v. Robbins, 409 F.2d 857 (1st Cir.1969), respectively. In Minsky, Minsky moved for the disclosure of all prior statements of one of the two key witnesses against him pursuant to the Jencks Act, 18 U.S.C. § 3500, during his trial. 963 F.2d at 872. After an in camera review of the routine investigation forms (“FBI 302s”), the court held an ex parte bench conference with the prosecutors to determine if the defense had been made aware of the evidence contained therein which could be used to attack the witness’ credibility pursuant to the Jencks Act and to Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963). The Sixth Circuit found that this ex parte bench conference was a ground for reversal. The court stated that: The ex parte conference in the instant case occurred at a time when the defense was arguing that the FBI 302s were subject to disclosure under the Jencks Act and Brady. The release of this material would have allowed the defense to undermine the credibility of ... a key government witness. The government has proffered no explanation why the defense was denied an opportunity to participate in a conference at such a critical stage of the proceedings. We refuse to condone conduct that “undermines confidence in the impartiality of the court.” Id. at 874 (citing United States v. Earley, 746 F.2d 412, 416 (8th Cir.1984)). The Sixth Circuit held that the ex parte conference violated Minsky’s right to a fair trial and his rights under the Sixth Amendment. In Yohn, the judge in Yohn’s criminal trial originally decided to exclude a tape recording of a wiretap. 76 F.3d at 512. The prosecutor contacted Pennsylvania Supreme Court Chief Justice Robert N.C. Nix, who spoke with the trial judge. Id. at 513. Although the defense counsel was present at that time, he did not participate in the conversation because the judge and the prosecutor were on the two available telephones. Id. at 514. After the conversation with the Chief Justice, the trial judge admitted the tape. Yohn was subsequently found guilty. Id. at 515. The Third Circuit found that this ex parte communication had denied Yohn his right to assistance of counsel in a critical stage of the proceedings. The court stated: “ ‘Critical stages’ are those links in the prosecutorial chain of events in which the potential for incrimination inheres or at which the opportunity for effective defense must be seized or foregone.” The only way Yohn’s counsel could have effectively defended Yohn’s position was to be able to participate contemporaneously in the telephone conversation with the Chief Justice. Id. at 522 (citing United States ex rel. Reed v. Anderson, 461 F.2d 739, 742 (3d Cir.1972)). The court also found that this violation was not a harmless error. In Haller, Haller filed a Petition for a Writ of Habeas Corpus, contending that his constitutional rights had been violated when the prosecutor in his case had an ex parte communication with the sentencing judge after his guilty plea. 409 F.2d at 858. The prosecutor informed the sentencing judge of a statement made by the victim concerning Haller’s behavior during the commission of the crime. Id. at 859. The First Circuit found that this ex parte communication violated Haller’s due process rights. The court held that it was “improper for the prosecutor to convey information or to discuss any matter relating to the merits of the case or sentence with the judge in the absence of counsel.” Id. The court further stated that “not only is it a gross breach of the appearance of justice when defendant’s principal adversary is given private access to the ear of the court, it is a dangerous procedure.” Id. Appellants maintain that the instant case is analogous to these three cases in that they did not receive notice of the communication before it occurred, they did not have the opportunity to be heard during the ex parte communication, and the Government has not presented a justification of its decision to proceed ex parte instead of including defense counsel in the conversation. Moreover, appellants contend that their investigation after notification could only be a “tardy rebuttal” as described by Haller, 409 F.2d at 859. We find that the cases relied upon by appellants are distinguishable from the instant case. Yohn and Minsky are distinguishable because the ex parte communications in those cases occurred during trial and had a direct effect on defendants’ rights. Haller is also distinguishable because, in that case, the ex parte communication concerned facts about defendant’s conduct and were made to the judge sentencing defendant. The communications themselves, in these three cases, went to the merits of the case being presented against those defendants. The ex parte communication in the instant case, however, did not concern the presentation of, or the admissibility of, evidence from the Government’s point of view during an ongoing trial. Nor was the Government attempting to shape the sentence imposed by the district judge in any fashion. Instead, the communication merely served to give notice to the district court of a possibility of a violation of its sequestration order. Moreover, Yohn, Minsky, and Haller are distinguishable from the instant case because in this case there was a remedy for any alleged prejudice suffered by appellants due to the ex parte communication. The trial judge recused himself, and appellants were able to investigate the allegations. As a result, appellants called numerous witness at the evidentiary trial, and produced phone records and visitation logs to support the allegations. Moreover, appellants were able to present the testimony of their own private investigator who actually spoke to the women possibly involved. The brief conversation did not hamper their ability to present evidence from their own independent investigation. It may have been better to have the defense counsel made aware of the allegation at the same time that the district court was; however, this was not a situation where the opportunity for effective defense must have been seized or foregone. See Yohn, 76 F.3d at 522. As the district court properly found, “Judge Ha-den’s recusal from the case cured any possible taint that could be inferred.” S.A. 1 at 8. Appellants were given an opportunity to fully brief their arguments in front of a judge who had had no ex parte contact with either side. Therefore, the ex parte communication in the instant case did not occur at a critical stage of the proceedings, and the constitutional analysis employed by appellants is not applicable. Instead, the true question is whether the district court erred by denying appellants’ motions for new trials. In determining whether a new trial should be granted under Rule 33 of the Federal Rules of Criminal Procedure on the basis of newly discovered evidence, this circuit utilizes a five-part test: (i) is the evidence, in fact, newly discovered; (ii) are facts alleged from which the court may infer due diligence on the part of the movant; (iii) is the evidence relied upon not merely cumulative or impeaching; (iv) is the evidence material to the issues involved; and (v) would the evidence probably result in acquittal at a new trial? United States v. Chavis, 880 F.2d 788, 792 (4th Cir.1989) (citing United States v. Bales, 813 F.2d 1289, 1295 (4th Cir.1987)). The district court’s decision to deny a motion for a new trial is reviewed for an abuse of discretion. See United States v. Singh, 54 F.3d 1182, 1190 (4th Cir.1995) (citation omitted). Appellants generally must demonstrate that they can satisfy all five of these elements. See id. (“Without ruling out the possibility that a rare example might exist, we have never allowed a new trial unless defendant can establish all five elements.”). In the instant case, appellants cannot establish element three. The evidence that Stinson might have violated the sequestration order, if believed, would have been cumulative or impeaching at best. A review of the entire record shows that the defense thoroughly cross-examined the Government’s witnesses about the alleged collusion or collaboration with other witnesses. The record also contains allegations on the part of the defense that the testimony of the witnesses had been compromised because they had been housed together, transported together, and held in the same or adjacent cells immediately before or after testifying. Given the weight of the evidence against appellants, and the fact that the jury heard the allegations of witness collaboration, it is unlikely that they would have been acquitted if the evidence of the alleged violation of the sequestration order had been presented. Further, this evidence would be primarily used to attack Stinson’s credibility as a witness. However, “[t]his circuit has emphasized that new evidence going only to the credibility of a witness does not generally warrant the granting of a new trial.” United States v. Custis, 988 F.2d 1355, 1358 (4th Cir.1993) (citing United States v. Stockton, 788 F.2d 210, 220 (4th Cir.1986)). Finally, it is clear that the district court did not find the evidence of a violation of the sequestration order to be believable enough to warrant a new trial. The district court noted that appellants were “unable to point to an instance where any of these government witnesses changed their testimony to comport with that of another government witness.” S.A. 1 at 11. Further, the district court stated, “[a]s for the testimony of C. Adams, the Court finds that although he appeared to be a disinterested witness, his testimony was neither credible nor significantly corroborated.” Id. The district court was in the position to assess the credibility of the witnesses that appeared before it. “In view of its findings as to [C. Adams’] credibility, the district court did not abuse its discretion in denying appellants’ motion[s] for a new trial.” United States v. Dorlouis, 107 F.3d 248, 254 (4th Cir.1997). III. Appellants next argue that there was insufficient evidence to convict them of the conspiracy to possess with intent to distribute charge. To sustain a jury’s finding of guilt, we must look at the evidence in the light most favorable to the Government. United States v. Rusher, 966 F.2d 868, 878 (4th Cir.1992). When assessing the sufficiency of the evidence of a criminal conviction on direct review, “[t]he verdict of [the] jury must be sustained if there is substantial evidence, taking the view most favorable to the Government, to support it.” Glasser v. United States, 315 U.S. 60, 80, 62 S.Ct. 457, 86 L.Ed. 680 (1942). We must also “allow the government the benefit of all reasonable inferences from the facts proven to those sought to be established.” United States v. Tresvant, 677 F.2d 1018, 1021 (4th Cir.1982). As appellants were convicted of drug conspiracy in violation of 21 U.S.C. § 846, the Government had to prove beyond a reasonable doubt that there was “(1) an agreement to possess with intent to distribute the controlled substance named in the indictment existed between two or more persons; (2) that each of defendants knew of the conspiracy; and (3) that each defendant knowingly and voluntarily became a part of the conspiracy.” United States v. Burgos, 94 F.3d 849, 857 (4th Cir.1996) (en banc). A review of the record shows that the Government presented ample evidence that appellants were involved in a large-scale drug distribution conspiracy, and had used several businesses to facilitate their illegal drug distribution, including W. Rhynes’ numerous Big Apple Food Stores, M. Rhynes’ Pizza Gallery and Hi-Energy Party Shop, and A. Adams’ Little Booker II convenience stores. The first witness called by the Government, James Edward “Ned” Johnson (“Johnson”), testified that he operated three drug houses, and that W. Rhynes had served as his supplier. See J.A. at 292-303. Johnson claimed that he placed property in W. Rhynes’ name to bolster W. Rhynes’ reputation, and that he invested in businesses recommended by W. Rhynes, some of which were owned or operated by some of the other appellants. See J.A. at 320-49. Johnson also testified that he obtained cutting agents from W. Rhynes’ Wilmore area store, which was operated by Gormley. J.A. at 308. Johnson’s claims were corroborated by his former girlfriend, Gloria Jean Holloway. See J.A. at 488-91. Theodore Howze (“Howze”) testified that he and T. Adams distributed small amounts of cocaine together beginning in 1984. J.A. at 537, 541. He testified that their supplier was A. Adams, and that on numerous occasions he had also obtained quantities of mannitol, a cutting agent, from A. Adams’ store. J.A. at 541, 545. He also testified that he had seen T. Adams distribute heroin. J.A. at 550-51. He asserted that T. Adams told Mm that the supplier of the heroin was W. Rhynes. J.A. at 552. Howze also testified to a single cocaine transaction between himself and W. Rhynes, and to numerous heroin transactions between the two. J.A. at 556, 560-61. Howze further testified that White had supplied him with quantities of heroin. J.A. at 555-556. Howze also testified that he purchased mannitol and quinine, another cutting agent, from McCoy at M. Rhynes’ store, where McCoy worked, and that he also once sold four ounces of cocaine to McCoy. J.A. at 557-58. The Government also called Thomas Douglas (“Douglas”), who testified that he purchased drugs from T. Adams, and that T. Adams had told him that W. Rhynes was the supplier of the drugs. J.A. at 692, 694-95. He also testified that he purchased a cutting agent from the store operated by Gormley. J.A. at 705-708. Douglas testified that White sold him heroin, and that White would purchase heroin from W. Rhynes for his own personal use and also to sell. J.A. 701-705. Douglas also testified that on one occasion he purchased drugs from Willie Marble (“Marble”), who he characterized as a “guy worMng for” M. Rhynes. J.A. at 710-715. Leroy Huntley, Jr. (“Huntley”) testified that he obtained heroin from W. Rhynes in the 1970s. J.A. at 818-20. He testified that in the 1980s, after W. Rhynes had opened his Big Apple Stores on Statesville Avenue and Cliffwood Place, he purchased cutting agents from W. Rhynes at both locations. J.A. at 823-24. He also testified that he bought drugs from White two or three times a day from 1973 to about 1990. J.A. at 826. Huntley also testified that after Melvin Huntley sold him some heroin that was of poor quality, he asked W. Rhynes for a refund, because Melvin Huntley had told him that W. Rhynes was the supplier of the drugs. J.A. at 833. He testified that W. Rhynes gave him a refund for the drugs. Id. He also testified that T. Adams sold him cocaine twice in the 1970s. J.A. at 835. Further, he testified that he was present when T. Adams was robbed and warned the robbers that he was going to tell W. Rhynes about the incident. J.A. at 838. The Government called Shirley Ingram, Jr. (“Ingram”), who testified he traded heroin and marijuana in the mid-1970s with A. Adams until they got into an argument. J.A. at 892-93. He testified that W. Rhymes was often present when these transactions occurred. J.A. at 893. He testified that he sold stolen items to W. Rhynes and McCoy in exchange for drugs. J.A. at 894-95, 899-900. He also testified that T. Adams sold him heroin during the 1980s and 1990s. J.A. at 902-04. Further, he stated that from the early 1970s until 1985, and then in the early 1990s, he purchased heroin from WMte on a daily basis. J.A. at 906-07. He asserted that the heroin he received from White was packaged in the same manner as the heroin he received from W. Rhynes. J.A. at 909. Gary Cannon testified that he was a longtime user of heroin who stole to support his habit. J.A. 921. He asserted that his first supplier of heroin, in the mid 1970’s, was Melvin Huntley, who stored the stolen merchandise in one of W. Rhynes’ stores. J.A. at 922. He also testified that Melvin Huntley had told him that W. Rhynes was his supplier of heroin. J.A. at 923. Cannon further claimed that White had also been a source for heroin between 1981 and 1990. J.A. at 924. He contended that White had told him that W. Rhynes was his supplier as well. J.A. at 937. Moreover, he asserted that he purchased bags for cocaine and mannitol from one of W. Rhynes’ stores. J.A. 929-31. He claimed that he purchased the same type bag, along with other drug paraphernalia, from McCoy at M. Rhynes’ Party Shop. J.A. at 931-33. Cannon also testified that in the 1980s he began purchasing cocaine for personal use from T. Adams. J.A. at 934-35. Ricky Rivers (“Rivers”) testified that he developed a relationship with W. Rhynes in which Rivers would bring in merchandise obtained through credit card fraud, and W. Rhynes would pay him for the merchandise. J.A. at 977-83. He stated that on the fourth transaction, W. Rhynes showed him a plastic bag filled with cocaine base, and told him that he could make more money selling the drug. J.A. at 983. Further, River claimed that A. Adams and M. Rhynes were present when W. Rhynes later showed him a briefcase filled with drugs and money. J.A. at 986, 988-90. Joe Richardson (“Richardson”) testified that he had been a member of two drug organizations, and that W. Rhynes, in their first deal, bought one ounce of cocaine from his partners and himself, after checking the purity of the product. J.A. at 1083-86. He asserted that they had numerous transactions after that instance, but he was not W. Rhynes’ primary source of cocaine. J.A. at 1087-91. He further testified that he acted as the middleman between W. Rhynes and a source named Jesse. J.A. at 1091. He claimed that W. Rhynes asked him to look for a source for heroin as well. J.A. at 1094. The Government also called Patricia Paige (“Paige”), who described her long-term addiction to heroin. See J.A. at 1136-37. She admitted that she had a personal friendship and a drug relationship with T. Adams. J.A. at 1137. She testified that on three occasions she accompanied T. Adams to one of W. Rhynes’ stores to get heroin. J.A. at 1138, 1141-44. She also testified that T. Adams told her that W. Rhynes was his supplier. J.A. at 1143-44. Diane Corry (“Corry”) and Michael Pen-dry both testified that White sold them heroin in the mid to late 1970s until the 1990s. J.A. at 1170, 1337-42. Corry asserted that White told her that he obtained the drugs from W. Rhynes. J.A. at 1173. She also testified that although she had never seen him distribute drugs, she had seen drugs in T. Adams’ house. J.A. at 1176. The Government also called United States Postal Inspector Michael Riddle (“Riddle”), who testified about a controlled delivery he made of an Express Mail Package to the Cliffwood Place Big Apple store on May 5, 1994. J.A. at 1229. He testified that the Postal Inspectors were suspicious of a package addressed to the S & S Food Mart at 1600 Cliffwood Place, and thus had a narcotics dog sniff the package. After the dog did not make its usual response to contraband, the officers decided to deliver the package dressed as mail carriers. J.A. at 1229-30. Riddle admitted that the name of the store at that address was not S & S Food Mart as it was on the label. J.A. at 1231. Riddle testified that he and another officer went into the store. Id. He stated that he told the individual behind the counter that he had a package, and that the individual signed for the package. Id. After-wards, Riddle identified himself as a police officer and the individual opened the package revealing the cocaine and heroin inside. J.A. at 1233,1236-37. Officer James Kolbay testified that after the controlled delivery of the package, a consensual search of the Cliffwood store occurred, which uncovered drug paraphernalia including rolling papers, scouring pads, razor blades, plastic and glassine bags, glass stems, digital scales, mannitol, and weapons. J.A. at 1253-71, 1274-76, 1292-1305. Officer Charles H. Wither-spoon, Jr. (“Witherspoon”) testified that he was standing outside of the store while it was being searched. J.A. at 1294. With-erspoon stated that Gormley drove up, “carrying a black handgun ... in a shooting position, pointing to his left side,” and approached the store. J.A. at 1295. Witherspoon testified that he and the other investigators present pulled their weapons, identified themselves as police officers, and told Gormley to put the weapon down. Id. Gormley did so, retrieved a black briefcase from his ear, and then submitted to a pat down search. Id. During this search, Witherspoon testified, he took three weapons from Gormley. J.A. at 1296. Witherspoon also testified that he found “a small corner bag of cocaine residue” inside the briefcase. J.A. at 1300. Advertisements for mannitol and numerous business cards were in the briefcase as well. J.A. at 1302-04. Officer John Collins (“Collins”) testified about an incident that occurred with defendant White on March 7, 1994, in which he seized twenty-seven glassine bags of heroin from White. J.A. at 1310-15. Collins also testified that he seized forty-four bags of heroin on October 25, 1994 from White. J.A. at 1315-30. Collins gave his opinion, as an officer who had investigated over a thousand heroin eases, that the forty-four bags of heroin seized were packaged for sale, not personal use. J.A. at 1319-22. On cross-examination, Collins admitted that he did not see White selling the drugs to anyone. J.A. at 1323. Officer James Michael Hart testified that on July 7, 1994, he had seized drug paraphernalia and two weapons from Hi-Energy Party Shop, a business originally owned by M. Rhynes that was later sold to McCoy. S.A. 1 at 190-220. He also testified as to the use of the different items of paraphernalia found in the store. S.A. 1 at 190-220. Andy Stinson testified as to his relationship with W. Rhynes, M. Rhynes, and Lester McCoy. He contended that he began using W. Rhynes as a supplier in 1989. J.A. at 1360. He also testified that he had, on one occasion, provided two ounces of cocaine to W. Rhynes on credit, and on approximately four occasions in 1989 and 1990, W. Rhynes provided cocaine on credit to Stinson. See J.A. at 1363-65. Further, Stinson claimed that he had purchased approximately two and one-half kilograms of cocaine from M. Rhynes. J.A. at 1368. Stinson also testified that he rented the store to W. Rhynes in which M. Rhynes opened the Hi-Energy Party Shop, and that drug paraphernalia was sold from the store in the 1980. J.A. at 1369-70,1372. Marvin Marco Graham (“Graham”) testified that he began working in A. Adams’ convenience store in 1986, cleaning, running the cash register, ordering stock, and running errands. J.A. at 1486-87. He asserted that one of these errands was to go to a store called Tape City to pick up packages of cutting agents for A. Adams. J.A. at 1487. He testified that he saw White and A. Adams processing heroin. J.A. at 1489-90. Graham also testified that A. Adams told him that W. Rhynes was his supplier of heroin. J.A. at 1491. He testified that he would often accompany A. Adams to W. Rhynes’ Statesville Avenue Big Apple Store, where A. Adams and W. Rhynes would meet in W. Rhynes’ office. J.A. at 1491. Graham stated that A. Adams would leave the office carrying a paper bag, which A. Adams would give to him to hold while A. Adams’ drove. J.A. at 1493. He testified that on one occasion, A. Adams told him: “if the police stopped or got behind us or anything, for me to jump our of the van and run with the bag and whatever I did with it, don’t throw it down.” Id. Graham testified that he began selling cocaine for A. Adams in 1989 or 1990. J.A. at 1494. He further testified that he witnessed a transaction between Kent Wallace (“Wallace”) and M. Rhynes at M. Rhynes’ Pizza Gallery. J.A. at 1504-1506. Graham also testified that he purchased drug paraphernalia from McCoy at the Party Shop. J.A. at 1503-04. Manning Sweat, III testified that he went to A. Adams’ store on a daily basis to purchase mannitol. Id. He stated that he began conducting drug transactions with A. Adams in 1990, supplying the latter with cocaine. J.A. at 1595-97. He stated that he had a conversation with A. Adams in which the latter told him that he needed to sell heroin instead of cocaine. J.A. at 1599. He stated that he never conducted any heroin deals, and that he and A. Adams eventually stopped conducting business after A. Adams did not pay him the full amount for some of the cocaine that he supplied. J.A. at 1599-1600. He also testified that he bought drug paraphernalia from McCoy at the Party Shop. J.A. at 1602. Kenny Funderburk testified that he supplied powder cocaine to M. Rhynes from 1988 until 1992. J.A. at 1626-31. He also testified that M. Rhynes was also a supplier of cocaine to others. J.A. at 1631. He stated that on one of their frequent trips to Washington, D.C., M. Rhynes told him that there may possibly be a cheaper source of cocaine for him. J.A. at 1632. Further, he testified that he had given three kilograms of cocaine to M. Rhynes on credit, and when it was time for him to pay, M. Rhynes paid for two but told him he could not pay for the third until Stinson paid M. Rhynes. J.A. at 1633-34. He testified that although he was eventually paid for this deal, M. Rhynes later did not pay for another deal, claiming that he had been robbed. JA. at 1634. He stated that he stopped doing business with M. Rhynes because of this incident. J.A. 1634-35. D.S. Davis, Jr. testified that he was a sometime user of drugs, who sold drugs in Charlotte in 1987 or 1988. J.A. at 1692. He testified that he twice approached Cor-win Alexander, a friend of M. Rhynes, and asked Alexander if he would talk to M. Rhynes about allowing him to have some cocaine on credit. J.A. at 1696-99 He stated that he contacted M. Rhynes directly, and they conducted four drug transactions. J.A. at 1697-04. He also testified that he purchased bags and cutting agents from M. Rhynes and McCoy at the Party Shop in late 1990 to early 1991. J.A. at 1706-07. Lester Norman, Jr. (“Norman”) testified that M. Rhynes was one of his suppliers of cocaine beginning in 1990 and continuing until his arrest in 1992. J.A. 1735-38. He testified that he and M. Rhynes never exchanged the drugs for the money at the same time because “if something else was to happen, we wouldn’t get caught with the money and the drugs.” J.A. at 1741. He also testified that he purchased cutting agents from the Party Shop. J.A. at 1741. Charles Ivey testified that he witnessed Norman and M. Rhynes conducting drug transactions, after which he and Norman would then sell the purchased drugs. J.A. at 1771-1773. He also testified that he was present when Norman purchased cutting agent from M. Rhynes and from McCoy at the Party Shop. J.A. at 1775-77. He further stated that hé was present when Tim Perry picked up cocaine from T. Adams. J.A. at 1777-78. The Government also called Timothy Perry, who testified that T. Adams became his supplier of mostly powder cocaine and occasionally crack cocaine in the late 1980s. J.A. at 1834-36. He further stated that he purchased mannitol for T. Adams, and that T. Adams showed him how to cut cocaine with the mannitol. J.A. at 1838-39. He stated the he also purchased the cutting agent from W. Rhynes. J.A. at 1839. He stated that he once saw T. Adams with heroin. J.A. at 1842-43. Further, he testified that he purchased drug paraphernalia from M. Rhynes’ Pizza Gallery from McCoy in the early 1990s. J.A. at 1844-45. Tyran Hicks (“Hicks”) testified that he had purchased drug paraphernalia from the Party Shop, although he did not know that M. Rhynes “was affiliated with” it at first. J.A. at 1876. He stated that he had been told that he resembled M. Rhynes, and that he met Rhynes in 1991, after he opened a body and repair shop as a front for his own drug activities. J.A. at 1875, 1877. He stated that M. Rhynes and his friend Corwin, stopped by his shop, and that he discussed with M. Rhynes “what [sic] was a good bondsman and a good lawyer.” J.A. at 1878. He also testified that on another occasion, he stopped by the Party Store and discussed the drug trade, especially heroin, in the Charlotte area. J.A. at 1879. Further, he contended that after he asked M. Rhynes about cocaine, the latter gave him Wallace’s phone number, and as a result Wallace and Hicks “made a small drug transaction.” J.A. at 1880. He stated that M. Rhynes often referred him to Wallace. J.A. at 1886. He also testified that he once had a conversation with M. Rhynes and W. Rhynes, in which W. Rhynes told him that he could make better money if he would dealing with W. Rhynes. J.A. at 1884. He testified that he never did any deals with W. Rhynes, and that W. Rhynes made a veiled threat against him because he was “selling drugs in the complex in the back of[W. Rhynes’] store.... ” J.A. at 1885. He also testified that he bought drug paraphernalia from McCoy at the Party Shop in 1993 and 1994. J.A. at 1887. Finally, the Government called Michael Pahutski, who testified about his connection to W. Rhynes, M. Rhynes, Gormley, and McCoy. He testified that he had a bookkeeper-client relationship with these defendants, preparing the books, profit and loss statements, payroll ledgers, and the tax returns for their respective businesses. S.A. 1 at 26-29. He testified that W. Rhynes, Gormley and McCoy requested that he inflate the numbers so that their business would show a profit and no suspicion would be raised by the Internal Revenue Service. J.A. at 65-68. Pahutski also testified that he saw mannitol in the numerous businesses, and that he had a conversation with McCoy about other drug paraphernalia. S.A. 1 at 68-70. He stated that he started using and distributing cocaine in' 1992 and was supplied by McCoy. S.A. 1 at 70-72. He also testified that he purchased drug paraphernalia, such as a grinder and scales at the Party Shop from McCoy. S.A. 1 at 72-73. Further, Pahutski testified that he purchased cocaine from Gormley, for almost a year. S.A. 1 at 73-74. Appellants vigorously cross-examined the Government’s witnesses at trial, questioning their credibility and motives for testifying. Nonetheless, the jury convicted defendants. Appellant M. Rhynes argues that viewed in the light most favorable to the Government, the evidence only shows that he engaged in buyer-seller transactions, and “if [he was] conspiring at all, [he] was conspiring against a co-defendant and not aiding the charged conspiracy.” Brief for Appellants at 23. Appellant Gormley argues that there was no evidence that he trafficked in marijuana and crack cocaine, and little evidence, other than Pahutski’s testimony about Gormley’s personal use of cocaine and the controlled delivery, that connects him to cocaine and heroin. Appellant White maintains that the evidence merely establishes that he was a heavy drug user, who sold heroin to support that habit. Appellant McCoy argues that the evidence only established that he had a legitimate employer-employee relationship with the Rhynes, but did not demonstrate that he was a member of a conspiracy. The other appellants join in the argument that the Government did not establish that they were members of a drug conspiracy beyond a reasonable doubt. Appellants also rely upon a decision from the Tenth Circuit, United States v. Singleton, 144 F.3d 1343 (10th Cir.1998), which held that witness testimony should be excluded where the witness is promised anything of value in exchange for his or her testimony. This decision has been subsequently rejected and vacated en bane. Furthermore, a number of circuits have rejected Singleton’s analysis. See e.g., United States v. Haese, 162 F.3d 359 (5th Cir.1998), cert. denied, — U.S. —, 119 S.Ct. 1795, 143 L.Ed.2d 1022 (1999); United States v. Ware, 161 F.3d 414 (6th Cir.1998), cert. denied, — U.S. —, 119 S.Ct. 1348, 143 L.Ed.2d 511 (1999). There is no precedent from this circuit to support appellants’ position that we should not consider the evidence of the Government’s cooperating witnesses in making our determination of whether there was sufficient evidence to convict these defendants. Circumstantial evidence, including a defendant’s “relationship with other members of the conspiracy, the length of this association, his attitude, conduct, and the nature of the conspiracy,” may be used to prove the existence of and the participation in a conspiracy. United States v. Brown, 856 F.2d 710, 711 (4th Cir.1988). Further, “[t]o sustain [a] conspiracy conviction, there need only be a showing that [the] defendant knew of the conspiracy’s purpose and some action indicating his participation.” United States v. Collazo, 732 F.2d 1200, 1205 (4th Cir.1984). Viewed in the light most favorable to the Government, there is substantial evidence in the record from which a reasonable finder of fact could have determined that a drug conspiracy existed. After there has been a showing that a conspiracy exists, only a slight connection between defendant and the conspiracy need be established in order to sustain the conviction. See United States v. Seni, 662 F.2d 277, 285 n. 7 (4th Cir.1981). Drawing reasonable inferences from the facts presented to it, such as the familial and business relationships between defendants, the jury could find that defendants were knowingly and voluntarily involved in that conspiracy. Thus, we affirm the trial court’s denial of appellants’ motion for judgment of acquittal based upon the insufficiency of the evidence. IV. Appellant M. Rhynes next argues that the district court abused its discretion in striking the testimony of one of his witnesses, Corwin Alexander. Alexander testified that he was M. Rhynes’ best friend. J.A. at 1945C. He spoke about M. Rhynes’ involvement with W. Rhynes’ businesses. J.A. at 1945G-J. Further, he testified about his knowledge of one of the Government’s witnesses, D.S. Davis. He stated that Davis asked him about obtaining some drugs, and he told Davis that he was not involved with drugs at all. J.A. at 1945K. He stated that Davis informed him that Davis was a drug dealer. Id. He also testified about having a conversation with Davis about the amount of time Davis was facing after he was arrested. J.A. at 1945L. He stated that Davis told him that, even though he did not have any incriminating evidence against M. Rhynes, the authorities wanted him to implicate M. Rhynes, or he would face more time in prison. Id. While discussing this conversation, Alexander made a statement that indicated to the Government that he had heard about Davis’ prior testimony. See J.A. at 1945. The Government promptly objected and asked to approach the bench. At the bench conference, Michael Scofield, counsel for M. Rhynes, told the district judge that he had discussed Davis’ testimony with Alexander. He stated, “I specifically told him about that testimony and told him I was going to ask him about that, Your Honor. And I don’t think that violates the sequestration order.” J.A. at 1945M. The district court judge indicated that he believed that the sequestration order had been violated. Counsel for M. Rhynes stated that he discussed the testimony in order to prepare Alexander to testify, as Davis had accused Alexander of being a drug dealer as well. Id. The Government moved to exclude the testimony of Alexander. The district court judge stated that he found the conduct of M. Rhynes’ counsel to be unprofessional, and excused the witness. J.A. at 1945M-N. The judge then told the jury to disregard the testimony that had been offered by Alexander. The judge did not conduct a voir dire examination of Alexander before excusing him. After the afternoon recess, counsel for M. Rhynes requested- another bench conference. J.A. at 1945P. At this bench conference, counsel made a proffer of the testimony that Alexander would have given because the judge had indicated that he would not revisit his decision to strike Alexander’s testimony. Counsel for M. Rhynes stated that Alexander would have testified that he never dealt drugs, and that he knew Davis well enough to form the opinion that Davis was untruthful. Id. Further, Alexander would have provided corroboration for M. Rhynes’ testimony about an automobile accident and an insurance settlement, which would provide a legal explanation for what the Government had presented as M. Rhynes’ “unexplained wealth.” Counsel for M. Rhynes also indicated that Alexander would have challenged Howze’s testimony about his dealings with M. Rhynes, and would have offered his opinion that Stinson, Funder-burk, Norman, Harrison, and Hicks were untruthful. J.A. at 1945Rr-S. ' Further, counsel for M. Rhynes indicated that Alexander would have explained that the purpose of a 1994 trip taken by himself and M. Rhynes had nothing to do with the drug trade, and would have corroborated other details about M. Rhynes’ life. J.A. at 1945S. The district court judge decided to not revisit the issue. J.A. at 1945T. M. Rhynes argues that his counsel had the duty to investigate and interview witnesses prior to presenting' their testimony. Counsel for M. Rhynes claims that he discussed Davis’ allegation that Alexander was a drug dealer with Alexander “to determine (1) if Alexander would invoke the Fifth Amendment if confronted on the stand with the Davis allegation; (2) if Alexander’s expected denial of such involvement was credible and (3) what relationship had existed between Alexander and Davis that might prompt such a false allegation by Davis.” Brief for Appellant at 34. M. Rhynes contends that it would have been a poor defense strategy for his counsel to call a witness knowing that witness would invoke the Fifth Amendment. See Chandler v. Jones, 813 F.2d 773 (6th Cir.1987). Moreover, M. Rhynes contends that his counsel’s interview of Alexander did not violate Federal Rule of Evidence 615 or the district court’s instructions regarding the sequestration order it was granting. Rule 615 provides: At the request of a party the court shall order witnesses excluded so that they cannot hear the testimony of other witnesses, and it may make the order of its own motion. This rule does not authorize exclusion of (1) a party who is a natural person, or (2) an officer or employee of a party which is not a natural person designated as its representative by its attorney, or (3) a person whose presence is shown by a party to be essential to the presentation of the party’s cause, or (4) a person authorized by statute to be present. When the court granted the defense’s motion for sequestration, the district court stated: THE COURT: Well, I do grant the usual sequestration rule and that is that the witnesses shall not discuss one with the other their testimony and particularly that would apply to those witnesses who have completed testimony not to discuss testimony with prospective witnesses, and I direct the Marshal’s Service, as much as can be done, to keep those witnesses separate and apart from the witnesses who have not yet given testimony who might be in the custody of the marshal. J.A. at 273-74. The district court exempted the Government’s case agent and summary witness, and defendants’ investigator, “[s]o long as [he] observe[d] Rule 615 and [did] not talk to the witnesses about testimony that has just concluded or testimony that has concluded.” J.A. at 275. The district court required the defense to make a representation that the investigator would not talk to the witnesses. M. Rhynes contends that neither Rule 615 nor the court’s order indicates that his counsel could not conduct the interview of Alexander as to Davis’ allegations. He further cites a leading treatise for the proposition that “[if] exclusion is ordered, the witnesses should be instructed not to discuss the case among themselves or with anyone except counsel for either side.” 2 Charles A. Wright, Federal Practice & Procedure § 415 (2d ed.1982). M. Rhynes also argues that “[i]f defense counsel, actively fulfilling his constitutional function, is to be prohibited from such an interview with his own key witness, there must be a specific directive by the trial court to prohibit what would otherwise .be a normal and expected Sixth Amendment obligation.” Brief for Appellants at 36. See Geders v. United States, 425 U.S. 80, 87, 96 S.Ct. 1330, 47 L.Ed.2d 592 (1976) (forbidding a sequestration order that prohibited a defendant-witness from conferring with his counsel). M. Rhynes contends that if the court wanted defense counsel to not speak to witnesses about prior witness testimony, it could have made this known as it did with defense’s investigator. These arguments fail to persuade us to overturn the district court’s decision. An appellate court is obliged to allow district courts discretion to preserve the integrity of a trial. Substantial deference is due a district court’s evidentiary rulings and reversal may occur only where there has been an abuse of discretion. General Elec. Co. v. Joiner, 522 U.S. 136, 141, 118 S.Ct. 512, 139 L.Ed.2d 508 (1997). This deference is especially appropriate where, as here, the district court’s actions are designed to protect the truthfulness of testimony. As the Supreme Court has stated, “If truth and fairness are not to be sacrificed, the judge must exert substantial control over the proceedings.” Geders, 425 U.S. at 87, 96 S.Ct. 1330. The judicial system as a whole has a global interest in protecting the truth-finding process. Conduct such as witness coaching and perjury threatens to destroy the integrity of this process. The risk of this type of conduct inhered in the circumstances of this case. This was a multi-defendant conspiracy with the potential for a variety of conflicting stories from the respective defendants. We cannot say that the district judge was unreasonably on heightened alert to the risks of tailoring. Nor can we say that his actions to combat these risks were unreasonable. The sequestration order was drawn to ensure that there was no witness coaching, collusion among witnesses, or tailoring of testimony. While cross-examination plays an important role in preventing these ills, it may not be the complete answer. In fact, the very availability of a sequestration order under Fed.R.Evid. 615 reflects the judgment of the drafters that cross-examination may not be wholly sufficient to safeguard the truth-finding function in all circumstances. Further, Rule 615 is not the limit of a district court’s supervisory authority over the conduct of a trial. See United States v. Sepulveda, 15 F.3d 1161, 1176 (1st Cir.1993). The court may take additional measures to prevent the tailoring and fabrication of witness testimony, such as prohibiting witnesses from discussing the case with one another, from discussing the case with any attorney, and from reading transcripts of the trial testimony of other witnesses. See Michael Graham, Federal Practice and Procedure, Federal Rules of Evidence § 6611, at 216-18 (interim ed. 1992). Although the dissent challenges the district court’s interpretation of its order, district courts are best able to interpret their own orders. See Vaughns v. Board of Educ. of Prince George’s County, 758 F.2d 983, 989 (4th Cir.1985). We have noted that district courts are entitled to “inherent deference” when they construe the same. Anderson v. Stephens, 875 F.2d 76, 80 n. 8 (4th Cir.1989). Indeed, reversal of a district court’s interpretation of its own order may occur only when “the record clearly shows an abuse of discretion.” Texas N.W. Ry. Co. v. Diamond Shamrock Ref. & Mktg. Co. (In re Chicago, Rock Island & Pacific R.R. Co.), 865 F.2d 807, 810 (7th Cir.1988) (internal quotation marks omitted). Here the district court’s interpretation of its order was a reasonable one. The purpose of a sequestration order “is, of course, to prevent the possibility of one witness shaping his testimony to match that given by other witnesses at the trial.” United States v. Leggett, 326 F.2d 613, 613 (4th Cir.1964). Given the danger of tailoring, allowing an attorney to inform a witness of other witnesses’ testimony poses the exact same risk as allowing witnesses to speak with one another. If the attorney is permitted to convey the same information that a witness was not allowed to obtain from another source, then the sequestration order may be effectively nullified. The district court was thus within its discretion to interpret its order in a manner that prevented the defense from undermining the very purpose of that order. Even were we to think, as the dissent does, that the district court’s interpretation resulted in an “overbroad” sequestration order, that would still not suffice to undermine the district court’s reasonable attempt to ensure the integrity of the proceedings before it. The dissent complains that neither Rule 615 nor the district court’s order barred any attorney from speaking with any witness. But as stated above, the district court properly exercised its discretion to interpret its order in light of the order’s manifest intent. The fact that the text of the order may not have expressly--mentioned attorney-witness communications does not alter this conclusion. In fact, other circuits have recognized that a sequestration order may cover more than courtroom exclusion even if the order mentions only exclusion. See, e.g., United States v. Greschner, 802 F.2d 373, 375 (10th Cir.1986) (Rule 615 also prohibits discussion of case between witnesses); Miller v. Universal City Studios, Inc., 650 F.2d 1365, 1373 (5th Cir.1981) (Rule 615 prohibits the reading of trial transcripts). These cases recognize that trial judges are entitled to be on alert to the myriad ways in which individuals may attempt to circumvent sequestration orders. Moreover, the district judge did not find a violation of the order simply because defense counsel spoke generally about the case with a witness who was yet to testify. Rather, the district judge sanctioned the defense because the attorney had conveyed precisely that information which the sequestration order was designed to withhold from prospective witnesses — namely, the testimony of prior witnesses in the case. It would undoubtedly benefit every defense witness to know what a prosecution witness had or,had not said on the stand. This is especially so where, as here, a prosecution witness has linked the defense witness to the defendant’s own alleged illegal activities. A defense witness equipped with this specific knowledge has an opportunity to tailor his testimony to respond more convincingly to such allegations. In this case, Alexander and M. Rhynes stood to gain much from Alexander’s knowledge of Davis’ testimony. Davis was the single most problematic witness from Alexander’s point of view. Not only did Davis testify that M. Rhynes was a drug dealer, but he also linked Alexander with M. Rhynes’ drug dealing. Davis testified that he asked Alexander on several occasions to help him procure cocaine from M. Rhynes. Moreover, Davis testified that Alexander in fact served as an intermediary between Davis and M. Rhynes after these conversations. Alexander was put on the stand by M. Rhynes to offer exculpatory testimony at odds with Davis’ incul-patory testimony. Alexander was also likely to be confronted with Davis’ allegations that Alexander himself- was involved in M. Rhynes’ drug business. It is clear that Alexander could be more specific, more credible, and more forceful in his denials of both M. Rhynes’ guilt and his own participation in the drug business if Alexander knew beforehand the details of Davis’ testimony. Knowledge of Davis’ prior testimony would enable Alexander to ensure that his words on the stand dovetailed comfortably with parts of Davis’ account while denying those parts of Davis’ testimony which incriminated Alexander. If Davis’ testimony could be explained away, then Alexander would be free from the main difficulty plaguing his efforts to exculpate M. Rhynes. Thus, when it came to light that Alexander had been alerted to Davis’ prior testimony, the district judge was obviously disturbed by this disclosure and within his rights to remedy it. The dissent does not deny that M. Rhynes and Alexander both stood to gain greatly from Alexander’s awareness of Davis’ testimony. The dissent also does not deny