OPINION
A jury сonvicted David E. Henley, Jr. of several offenses related to the distribution of methamphetamine, for which the district court imposed a sentence of life imprisonment. Here, Henley has a number of challenges to his trial and sentence, yet little support for his conclusions. Thus, we affirm.
I. BACKGROUND
At the time of his August 28, 2001, indictment on methamphetamine related charges, Henley was twenty-four years old *512 and had no prior criminal record. While several of his co-conspirators — most notably Soрhan Luy and Bryan Sanders— pleaded guilty, Henley exercised his Sixth Amendment right to a jury trial. At Henley’s trial, Luy and Sanders testified against him in hopes of receiving a reduction in their respective sentences- — which they did ultimately receive. At the conclusion of the trial, the jury convicted Henley of possession with the intent to distribute in excess of fifty grams of methamphetamine in violation of 21 U.S.C. §§ 841(a)(1) and 841(b)(1)(B), conspiracy to distribute in excess of five hundred grams of methamphetamine in violation of 21 U.S.C. § 841(a)(1) and (b)(1)(A), and using a “communication facility” to facilitate his drug offenses in violation of 21 U.S.C. § 843(b).
Among the issues at sentencing was the quantity of methamphetamine involved in the conspiracy. Under the 2001 United States Sentencing Guidelines, which govern this case, a base offense level of thirty-six applies where the quantity of methamphetamine attributable to the defendant is between five and fifteen kilograms. U.S.S.G. § 2D1.1(c)(2). The presentence report attributed 14.989 kilograms of methamphetamine to Henley. The distriсt court declined to adopt this amount and instead undertook an independent examination of the record. Based solely upon the trial testimony of Sophan Luy, the district court found Henley responsible for at least five kilograms of methamphetamine. Therefore, despite the considerable difference between the drug quantity estimated in the presentence report and the quantity found by the district court, under section 2D1.1(c)(2) of the Sentencing Guidelines the district cоurt had no choice but to apply the same base offense level— thirty-six — as provided in the presentence report.
The district court also assessed several sentencing enhancements: a two-point enhancement pursuant to section 2D1.1(b)(1) for possession of a firearm; a three-point enhancement pursuant to section 3B1.1 for Henley’s supervisory role in the conspiracy; and a two-point enhancement pursuant to section 3C1.1 for obstruction оf justice. These sentencing enhancements brought Henley’s total offense level to forty-three, which carries a mandatory life sentence.
In a striking illustration of the disparity in sentences imposed upon similarly situated defendants depending upon whether they exercise their Sixth Amendment right to a jury trial or waive that right in favor of a plea bargain, Luy and Sanders received prison sentences of 87 months 1 and 93 months, 2 respectively. United States v. *513 Luy, Case No. 1:00-CR-46, Order Amending Judgment (E.D.Tenn.); United States v. Sanders, Case No. 1:01-CR-98, Order Amending Judgment (E.D.Tenn.).
In this timely appeal, Henley challenges his conviction and sentence оn several grounds. We address each of his arguments in turn.
II. ANALYSIS
A. Sufficiency of Evidence Establishing Henley’s Participation in a Conspiracy
Henley’s primary argument is that the evidence adduced at his trial was insufficient to establish the existence of a conspiracy to distribute methamphetamine and, even if a conspiracy existed, the evidence was insufficient to prove that he was a participant therein. Unfortunately for Henley, our review of the jury’s finding that he participated in a conspiracy to distribute methamphetamine is strictly limited. We review a challenge to the sufficiency of the evidence “by considering the evidence in the light most favorable to the prosecution to determine whether a rational trier of fact could have found that the essential elements of the crime were proven beyond a reasonable doubt.”
United States v. Spearman,
To prove a conspiracy, the following elements must be established:
(1) An object to be accomplished. (2) A plan or scheme embodying means to accomplish that object. (3) An agreement or understanding between two or more of the defendants whereby they become definitely committed to cooperate for the accomplishment of the object by the means embodied in the agreement, or by any effectual means.
United States v. Gibbs,
Contrary to Henley’s assertion, the evidence adduced at his trial, construed in the light most favorable to the United States, is sufficient to establish that a conspiraсy to distribute methamphetamine existed. Henley, Sanders, Luy and an individual named “Scott” from Atlanta apparently formed the core of the conspiracy. According to the testimony elicited at trial, Scott provided methamphetamine to Luy, who in turn sold it to Henley, who then sold it to Sanders, who sold it to others. In short, the evidence shows that Henley and one or more co-conspirators
*514
had an “understanding” to employ this “scheme” to accomplish the “object” of selling methamphetamine.
Gibbs,
Once a conspiracy has been shown, only “slight” evidence is needed to connect a defendant to a conspiracy.
Gibbs,
Because Sanders and Luy received downward departures as a result of their cooperation with the United States, Henley challenges the credibility of their testimony. It is not the province of this Court, however, to weigh the credibility of witnesses — particularly in the context of determining whether sufficient evidence supports a conviction.
United States v. Hilliard,
We certainly recognize that the prospect of a reduced sentence could have provided a powerful incentive for Henley’s co-conspirators to testify against him. Whether that incentive affected the credibility of their testimony, however, is for the jury to decide. The jury in this case was aware that Sanders and Luy had reason to believe that they could benefit from a reduction in their sentences as a result of their testimony against Henley. We simply cannot second-guess the jury’s determinations with regard to whether and to what extent that motive may have affected those witnesses’ credibility.
B. Quantity of Methamphetamine Attributable to Henley
Henley also challenges the district court’s determination of the quantity of methamphetamine for which he was responsible. The district court’s drug quantity determination “must stand unless it is clearly erroneous.”
United States v. Ward,
A court may hold a defendant responsible for an amount of drugs only if the court finds that it is more likely than not that the defendant actually was responsible for at least that amount. An approximation by a court is not clearly erroneous if it is supported by competent evidence in the record. In other words, the court finding must have some minimum indicium of reliability beyond mere allegation.
Ward,
In determining whether a district court’s calculation of drug quantity is clearly erroneous, a key issue is the extent to which the court identified the evidence on whiсh it relied in making that calculation.
Compare, e.g., United States v. Baro,
Based upon our careful review of the record, we conclude that the evidence supports the district court’s calculation of the quantity of methamphetamine attributable to Henley and that the court properly identified the particular evidence on which it relied in making that calculation. During the sentencing hearing, the district court referenced the testimony of various witnesses, but — in order to avoid “double counting” — relied exclusively upon Luy’s testimony in making its quantity determination. 3 Luy testified that over the course of eight to ten months, he traveled to Atlanta once a month and on each trip purchased four pounds of methamphetamine, keeping two pounds for himself and giving two pounds to Henley. Occasionally, Luy would make two trips per month instead of one, in which case he would purchase two pounds of methamphetamine on each trip, keeping one pound for himself and giving one pound to Henley. The district court concluded that Henley could be held liable for over five kilograms of *516 methamphetamine 4 based upon Luy’s testimony alone. The district judge explicitly considered Luy’s credibility and concluded: “I do have confidence in what Luy said” because his testimony was consistent with the testimony of other witnesses.
Henley challenges the district court’s reliance upon Luy’s testimony. Henley emphasizes that Luy received a reduction in his sentence as a result of his cooperation with the United Stаtes and contends that Luy was merely approximating the quantity of drugs that he provided to Henley.
5
We find these arguments to be unavailing. Testimonial evidence from a co-conspirator may be sufficient to determine the amount of drugs for which a defendant should be held accountable, even where the co-conspirator has reason to believe that he may receive a reduced sentence as a result of his or her testimony.
United States v. Hernandez,
The district court’s determination that Henley was responsible for five kilograms or more of methamphetamine was properly suppоrted by Luy’s testimony and was not clearly erroneous.
C. Sentencing Enhancement Under Section 3B1.1
Henley also challenges the district court’s imposition of a three-level enhancement pursuant to section 3B1.1 of the Sentencing Guidelines for his supervisory role in the conspiracy. The proper standard of review to employ in evaluating the district court’s imposition of this enhancement is subject to some debate. Prior to the Supreme Court’s decision in
Buford v. United States,
Under section 3B1.1, a defendant’s base offense level should be increased as follows:
(a) If the defendant was an organizer or leader of a criminal activity that involved five or more participants *517 or was otherwise extensive, increase by 4 levels.
(b) If the defendant was a manager or supervisor (but not an organizer or leader) and the criminal activity involved five or more participants or was otherwise extensive, increase by 3 levels.
U.S.S.G. § 3B1.1(a), (b).
In order to apply a three-level enhancement under section 3Bl.l(b), there nеed only be evidence to support a finding that the defendant was a manager or supervisor of at least one other participant in the criminal activity, and that the criminal activity involved five or more participants or was otherwise extensive.
United States v. Caseslorente,
The district court found that the evidence established that five or more participants were involved in the criminal activity — Henley, Sanders, Luy, “Scott” from Atlanta, Chad Brown, Candiac Stanfield, Robert Walker and Christy Croy — and that Henley “was at the center of the conspiracy.” The court also found that:
[Henley] got this methamphetamine and he did control the distribution of it of what he got here locally. As has been pointed out in the presentence report and in the evidence at trial, and here by Mr. Piper, he did employ people, others, perhaps, аt least as many as four other persons to help him collect drug debts, enforcers, if you will. That includes Walker and Sanders, and the two people at the Logan’s Roadhouse. And he did recruit those people to do this. And this was an extensive conspiracy that involved a large amount of drugs. And he controlled the flow of those drugs to a large amount of people.
Sentencing Tr. JA 330.
In light of this evidence, the court concluded that Henley was “certainly” a “manager or supervisor” because he “did manage the distribution of the drugs” and “he managed other people.” Sentencing Tr. JA 331. As a result, the district court found that Henley should receive a three-level enhancement pursuant to section 3Bl.l(b), but it declined to impose the four-level enhancement urged by the United States.
Henley asserts that there is no evidence to support the district court’s conclusion that he employed enforcers to intimidate or assault other individuals. We disagree. Sanders testified that Henley and Robert Walker assaulted Chad Brown because of a drug debt. Sanders also testified that he had assisted Henley in assaulting an individual named Brett Oakey over a drug debt. Additionally, there was testimony that Henley was assisted by two other men when he assaulted Michael Williams in the restroom of Logan’s Roadhouse. That evidence is sufficient to support the district court’s conclusion that Henley was a “manager or supervisor” under section 3Bl.l(b).
Henley also argues that several оf the individuals identified by the court — particularly Stanfield and Croy — were not “participants” within the meaning of section *518 3B1.1, but rather were merely drug customers. A “participant” is defined as “a person who is criminally responsible for the commission of the offense, but need not have been convicted.” U.S.S.G. § 3B1.1, comment. (n.l). Even excluding Stanfield and Croy, however, we find that the evidence adduced at trial supports the district court’s determination that five or more individuals were criminally responsiblе for the offense.
D. Evidentiary Rulings
Finally, Henley challenges the district court’s admission of a tape recorded telephone conversation that he had with Sanders, as well as the testimony of two witnesses. Henley claims that the district court’s admission of this evidence was an abuse of discretion and violated Federal Rules of Evidence 401, 403 and 404. The propriety of the district court’s admission of evidence is reviewed for abuse of discretion.
United States v. Middleton,
The telephone conversation between Henley and Sanders was tape recorded by equipment at the Hamilton County Jail, where Sanders had been incarcerated. During the conversation, Henley told Sanders that “them fed pens are cush, man,” apparently implying that the federal penitentiary is not a difficult place to serve prison time. Henley and Sanders also discussed drugs, money, informants, the charges that Sanders was facing and other assorted topics. Henley objected to the admission of this tape recording, arguing that his comments implied that he had previously been convicted of a crime for which he served time in federal prison. He also argued' that the tape recording was irrelevant. The district court admitted this tape recording-over Henley’s objection.
We find that the tape recording was relevant because it tended to establish the relationship thаt he had with Sanders, his co-conspirator. Moreover, contrary to Henley’s assertion, we do not believe that his comments imply that he had previously served time in federal prison. Therefore, the admission of the tape recording did not violate the Federal Rules of Evidence and was not an abuse of discretion.
Henley also challenges the district court’s admission of testimony given by two witnesses: Dorothy Turner, the mother of Sanders’s girlfriend, and Randy Hood, Sanders’s neighbor. Turner testified that one night at her home, she observed Chad Brown’s head bleeding. Hood testified that in June 2001, he observed a truck that turned out to belong to Henley at Sanders’s home approximately three or four times. Hood further testified that on one occasion he observed a person, whom he could not identify, leave Sanders’s home, remove a pistol from the back of his pants and get into this truck.
Because Henley did not object at trial to the admissibility of either witness’s testimony, we must rеview the district court’s admission of this testimony for plain error.
See
Fed.R.Crim.P. 51;
United States v. Samour,
The district court committed no error in admitting this testimony. Turner’s testimоny was relevant because it tended to corroborate Sanders’s testimony that Henley and another individual, Robert Walker, assaulted Chad Brown at Turner’s home. Hood’s testimony was relevant because it tended to establish a relationship between Sanders and Henley and it corroborated Sanders’s testimony that Henley visited his home. Moreover, we find neither witness’s testimony to be violative of Rule 403 or Rule 404.
III. CONCLUSION
For the foregoing reasons, the district court’s judgment is AFFIRMED.
Notes
. Luy pleaded guilty to one сount of conspiracy to distribute methamphetamine, in violation of 21 U.S.C. § 846. United States v. Luy, Case No. 1:00-CR — 46-1, Judgment (E.D.Tenn.). As part of the plea agreement, six other counts in the indictment were dismissed. Id. Luy was originally sentenced to 136 months of imprisonment, but the United States subsequently filed a motion for a reduction in Luy’s sentence pursuant to Federal Rule of Criminal Procedure 35(b), which the district court granted, thereby reducing his sentence to 87 months. United States v. Luy, Case No. 1:00-CR-46, Order Amending Judgment (E.D.Tenn.).
. Sanders pleaded guilty to one count of conspiracy to distribute in excеss of fifty grams of methamphetamine, in violation of 21 U.S.C. §§ 846 and 841(b)(1)(B), as well as possession of a firearm in furtherance of a drug trafficking crime, in violation of 18 U.S.C. § 924(c)(1)(A)(I). United States v. Sanders, Case No. 1:01-CR-98-02, Judgment (E.D.Tenn.). As part of the plea agreement, the remaining count in the indictment was dismissed. Id. Sanders was originally sentenced to 101 months of imprisonment — 41 months on the first count and 60 months on the second, to be served consecutively. As in Luy’s case, however, the United States subsequently filed a motion for a reduction in *513 Sanders’s sentence pursuant to Rule 35(b), which the district court granted, thereby reducing his sentence to 93 months. United States v. Sanders, Case No. 1:01-CR-98, Order Amending Judgment (E.D. Tenn.).
. Henley argues that he lacked notice of the United States’ intent to rely upon Luy's testimony to establish the drug amounts. That notice was provided, however, in a June 14, 2002, letter from the United States to Henley’s counsel.
. Two pounds of methamphetamine per month over the course of 8 months equals sixteen pounds or approximately 7.3 kilograms.
. Henley also points out that Luy’s trial testimony differs in certain respects from his story as recounted in the presentence report. The presentence report provides that Luy traveled to Atlanta once a month for approximately one year (rather than the 8 to 10 months he testified to at trial) and picked up at least one pound of methamphetamine for Henley on each trip. This scenario would make Henley responsible for twelve pounds of methamphetamine, or approximately 5.4 kilograms. Under either version of events, then, Henley would still be responsible for over five kilograms of methamphetamine.
