United States v. Grover ( 1996 )


Menu:
  • UNPUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    UNITED STATES OF AMERICA,
    Plaintiff-Appellee,
    v.                                                       No. 94-5903
    CHARLES L. GROVER,
    Defendant-Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff-Appellee,
    v.                                                       No. 94-5937
    CHRISTOPHER HARRIS,
    Defendant-Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff-Appellee,
    v.                                                       No. 95-5096
    CHARLES DORSEY,
    Defendant-Appellant.
    Appeals from the United States District Court
    for the District of Maryland, at Baltimore.
    Benson E. Legg, District Judge.
    (CR-93-228-L)
    Argued: November 3, 1995
    Decided: May 6, 1996
    Before MICHAEL and MOTZ, Circuit Judges, and PHILLIPS,
    Senior Circuit Judge.
    Affirmed by unpublished per curiam opinion.
    _________________________________________________________________
    COUNSEL
    ARGUED: Denise Charlotte Barrett, Assistant Federal Public
    Defender, Baltimore, Maryland; Harry D. McKnett, Columbia, Mary-
    land; Donald Henry Feige, Baltimore, Maryland, for Appellants.
    Thomas Michael DiBiagio, Assistant United States Attorney, Balti-
    more, Maryland, for Appellee. ON BRIEF: James K. Bredar, Federal
    Public Defender, Martin Bahl, Staff Attorney, Baltimore, Maryland,
    for Appellants. Lynne A. Battaglia, United States Attorney, Balti-
    more, Maryland, for Appellee.
    _________________________________________________________________
    Unpublished opinions are not binding precedent in this circuit. See
    Local Rule 36(c).
    _________________________________________________________________
    OPINION
    PER CURIAM:
    Defendants Charles Dorsey, Charles Grover, and Christopher Har-
    ris were tried together and convicted of conspiracy to distribute crack
    cocaine in violation of 
    21 U.S.C. § 846
    . Dorsey was also convicted
    of distribution of crack cocaine in violation of 
    21 U.S.C. § 841
    .
    Defendants appeal their convictions on numerous grounds, and defen-
    dant Grover also appeals his sentence. For the following reasons, we
    affirm in all respects.
    I.
    The indictment charged the defendants (along with Kenny Dorsey,
    who remains a fugitive) with participating in a conspiracy to distrib-
    ute crack cocaine in Maryland from September 1991 to July 1993.
    The evidence presented at trial showed that Kenny Dorsey was
    responsible for multiple shipments of cocaine (totalling eighty kilo-
    2
    grams) from California to Maryland. Charles Dorsey (nephew of
    Kenny) served as the "distribution point" in Maryland. Charles Gro-
    ver acted as a courier on three shipments (totalling eight kilograms).
    The Dorseys supplied Tracy Washington with the cocaine. Washing-
    ton, along with Michael Walker, would sell distributable quantities to
    various individuals including Christopher Seymour, Johnny Johnson,
    Darius Bevins, and defendant Christopher Harris.
    In April 1992 police arrested Seymour who, in turn, implicated
    Walker. In May 1993 police arrested Walker, and he agreed to act as
    a confidential informant. Walker made two purchases of crack
    cocaine from Charles Dorsey and Washington; the purchases were
    recorded on video tape. Also, Walker recorded conversations with
    Charles Dorsey and Washington.
    While no video or recordings were made of Grover or Harris, in
    June 1993 Harris (who was a mailman) was driving a car in which
    Washington was a passenger when the Government recorded a tele-
    phone conversation between Washington and Walker concerning
    drugs. During the conversation, Walker asked Washington if he had
    the "mailman" with him and Washington responded that he did.
    Washington and Walker then joked about how "Chris" (i.e., Christo-
    pher Harris) drives like a mailman. In a second conversation between
    Walker and Washington, recorded in July 1993, Washington told
    Walker that he was trying to get rid of "three dirt bikes." Walker
    replied: "Give it to the post office." Washington then stated: "[he] or
    [they] already holding." According to trial testimony, "dirt bikes"
    referred to cocaine, "post office" meant Christopher Harris, and "al-
    ready holding" meant that Harris already had some cash or cocaine.
    Also, there was evidence showing multiple telephone calls and pager
    activations from Washington to Harris.
    As for Grover, motel, credit card, telephone, and car rental records
    confirm that he was in the Baltimore area at the time he was alleged
    to have delivered cocaine from California.
    In July 1993 the police arrested Washington, Johnson, and Bevins.
    All three agreed to act as cooperating witnesses in exchange for
    reduced sentences.
    3
    In August 1993 Charles Grover was arrested at the Ontario, Cali-
    fornia, airport. In Grover's suitcase police found pillows, fabric
    softener,1 and approximately $154,000 in cash, which was wrapped in
    plastic with rubber bands. During a search of Grover's home, the
    police found guns, ammunition, and other suitcases containing pil-
    lows and fabric softener. (The parties refer to this evidence as the
    "California evidence.")
    At trial Walker claimed that he and Washington would deliver dis-
    tributable quantities of crack cocaine to Harris. According to Walker,
    he would drop off cocaine with Harris and collect cocaine debts. And,
    when initially debriefed in May 1993 by Special Agent Jeffrey Silk
    of the Drug Enforcement Agency, Walker stated that Washington
    would distribute cocaine to a postal worker, though Walker did not
    expressly mention Harris by name. Walker did not, however, know
    where and to whom Harris was allegedly selling the cocaine.
    In addition, Walker testified that on several occasions from the
    spring through the fall of 1992, he met drug couriers at motels in the
    Baltimore area. The couriers, including Charles Grover, would deliver
    cocaine coming from Kenny Dorsey in California. Charles Dorsey
    monitored shipments from California to Maryland and handled the
    money sent back to California. Walker described six shipments that
    arrived in 1992 and said that Charles Dorsey and Charles Grover were
    involved in these shipments.
    Washington testified that Harris purchased cocaine from him on
    consignment, at first buying an ounce a month, and later taking 4 1/2
    ounces per month. Washington also testified that he would meet Har-
    ris at a car wash or send Walker to deliver the cocaine. Washington,
    like Walker, did not know what Harris did with the cocaine.
    Washington testified that he purchased drugs from Kenny Dorsey
    and identified Charles Dorsey and Charles Grover as persons
    involved in distribution.
    _________________________________________________________________
    1 Evidently, drug traffickers often use fabric softener to help disguise
    the smell of contraband.
    4
    Johnny Johnson testified that he purchased cocaine from Charles
    Dorsey. Darius Bevins testified that he would meet Washington at the
    car wash to purchase drugs. Bevins said he saw Harris meet with
    Washington at the car wash, though Bevins was unable to say that he
    saw Harris buy or possess drugs.
    The jury convicted the defendants. At sentencing, Charles Dorsey
    received 235 months imprisonment; Charles Grover received 151
    months; Christopher Harris received 78 months. This appeal fol-
    lowed.
    II.
    Defendants Grover and Dorsey claim that the district court erred
    when it allowed the Government to introduce the"California evi-
    dence" over defendants' objection as substantive evidence of the
    charged conspiracy. Again, such evidence includes $154,000 seized
    from Grover at the Ontario Airport, the materials Grover used in his
    attempt to hide the money (e.g., pillows and fabric softener), and the
    firearms and ammunition found at Grover's home.
    The defendants argue that the California evidence is not relevant
    under Rule 401 of the Federal Rules of Evidence and therefore not
    admissible under Rule 402 because it was seized in August 1993, a
    month after the charged conspiracy ended, and was unrelated to the
    drug trafficking activities that transpired in Maryland. The defendants
    also argue that even if the evidence is admissible under Rule 402, the
    court should have excluded the evidence under Rule 403, which gives
    the court discretion to exclude evidence when its probative value will
    be substantially outweighed by the danger of unfair prejudice. The
    defendants further argue that even if the evidence was admissible, it
    was only admissible as "other crimes" evidence under Rule 404(b)
    and that the district court's failure to give a limiting instruction under
    Rule 105 constitutes reversible error.
    We review the decision of a district court to admit evidence for
    "abuse of discretion." United States v. Gravely, 
    840 F.2d 1156
    , 1162
    (4th Cir. 1988). The indictment in this case charged a conspiracy to
    distribute crack cocaine "[f]rom on or about September of 1991,
    through in or about July of 1993, in the State and District of Maryland
    5
    . . . ." Because the California evidence was seized in August of 1993,
    the seizure clearly occurred after the charged conspiracy concluded.
    Moreover, the Government did not argue to the district court, nor did
    it argue to this court, that the money seized was proceeds of the drug
    trafficking activities in Maryland.
    Rather, the Government's theory is that the California evidence
    was properly admitted because the conspiracy charged in the indict-
    ment was part of a larger and more extensive narcotics conspiracy
    involving Kenny Dorsey and Charles Grover. This larger conspiracy
    continued past July of 1993 and involved narcotics trafficking
    throughout the United States. In addition, the California evidence was
    admissible because it corroborated the testimony of Walker and
    Washington that Grover acted as a drug courier for Kenny Dorsey
    during the course of the conspiracy charged in the indictment.
    We hold that it was not an abuse of discretion to admit the Califor-
    nia evidence as substantive evidence of the crime charged. While
    Rule 402 prohibits the introduction of evidence that is not relevant,
    Rule 401 provides that "``[r]elevant evidence' means evidence having
    any tendency to make the existence of any fact that is of consequence
    to the determination of the action more probable or less probable than
    it would be without the evidence." The Government therefore could
    introduce evidence that had any tendency to show the existence of the
    charged conspiracy and evidence that had any tendency to show Gro-
    ver's role in that conspiracy.
    The California evidence did both those things. It placed the
    charged conspiracy in the context of the larger conspiracy of which
    the charged conspiracy was a component part. Likewise, it buttressed
    the testimony of Walker and Washington that established Grover's
    role in the conspiracy, because it showed that Grover acted as a drug
    courier in a larger conspiracy which included Grover's trafficking
    activities in Maryland. See, e.g., United States v. Kennedy, 
    32 F.3d 876
    , 885 (4th Cir. 1994) ("evidence of uncharged conduct is not con-
    sidered ``other crimes' evidence if it arose out of the same series of
    transactions as the charged offense, . . . or if it is necessary to com-
    plete the story of the crime on trial") (citation and internal quotes
    omitted), cert. denied, 
    115 S. Ct. 939
     (1995). Thus, the California evi-
    dence was admissible.
    6
    We also hold that it was not an abuse of discretion for the district
    court to refuse to exclude the California evidence under Rule 403.2
    That rule is concerned with evidence that is unfairly prejudicial. Here,
    the Government does not run afoul of Rule 403. As we have already
    said, the California evidence helped place the charged conspiracy in
    the context of the larger conspiracy of which the charged conspiracy
    was a component part.
    Furthermore, because we hold that the evidence was admissible to
    prove the existence of the conspiracy charged in the indictment, the
    California evidence is not "other crimes" evidence within the meaning
    of Rule 404(b). See Kennedy, 
    32 F.3d at 885
    . No limiting instruction
    under Rule 105 was therefore necessary.3
    _________________________________________________________________
    2 Rule 403 provides that:
    Although relevant, evidence may be excluded if its probative
    value is substantially outweighed by the danger of unfair preju-
    dice, confusion of the issues, or misleading the jury, or by con-
    siderations of undue delay, waste of time, or needless
    presentation of cumulative evidence.
    3 Grover also claims that the district court erred when it denied his prior
    motion to suppress the California evidence. That claim is meritless. As
    an initial matter, Grover has a standing problem; at the suppression hear-
    ing he denied that he owned the suitcase containing the money. Accord-
    ingly, he cannot challenge the Government's search and seizure of the
    evidence. In addition, even if Grover has standing, there was ample evi-
    dence establishing probable cause to detain and arrest Grover and for the
    issuance of a warrant to search the suitcase. In particular, the police had
    been notified that there was a suspected narcotics trafficker (an R. Green)
    on Grover's plane; Los Angeles Police Department records revealed that
    an individual by the name of "R. Green" was suspected of heroin smug-
    gling; Grover was sitting in the seat assigned to R. Green; Grover
    matched the description of R. Green; and Grover's $1200.00 airline
    ticket had been purchased in cash. Also, when the police approached
    Grover (but before he was arrested), the police could smell the odor of
    fabric softener, which is used by drug couriers to conceal other smells;
    Grover stated that he did not possess an airline ticket; Grover did not
    have identification that matched his seat assignment or the tag on the
    suitcase; a check of computer records showed that Grover was a sus-
    pected drug trafficker; and a narcotics dog alerted on the suitcase. After
    the police obtained a search warrant and opened the suitcase, they found
    7
    III.
    Christopher Harris contests his conviction on three grounds. He
    claims that the district court abused its discretion when it denied his
    request to introduce evidence showing that Tracy Washington had
    previously been involved in a drug transaction with a postal employee
    other than himself. Harris also claims, along with Grover and Dorsey,
    that during closing argument to the jury the prosecutor impermissibly
    vouched for the credibility of the Government's chief witnesses by
    expressly stating that the witnesses' testimony was truthful. While
    defense counsel failed to object to the prosecutor's vouching at the
    time the statements were made, the defendants argue that the prosecu-
    tor's vouching constitutes plain, reversible error. Finally, Harris
    claims that the district court erred when it refused to instruct the jury
    that a mere buyer-seller relationship does not constitute sufficient evi-
    dence to support a conviction for conspiracy to distribute narcotics.
    As discussed below, we find that the district court did not abuse its
    discretion when it excluded proffered testimony that Washington
    dealt drugs with a postal employee other than Harris, and we further
    reject the claim that Harris was entitled to the buyer-seller instruction
    under the circumstances presented here. As for the claimed vouching,
    while we think that it is clear that the prosecutor's remarks were
    improper and not to be countenanced, we hold that in light of the
    entire proceedings the remarks were not so prejudicial as to under-
    mine the trial's fundamental fairness with respect to any of the defen-
    dants. We therefore conclude that the remarks do not constitute
    reversible error.
    _________________________________________________________________
    approximately $154,000 in cash; the cash was bound in bundles with
    rubber bands and wrapped in numerous scented fabric softener sheets.
    Based on the police detectives' training, knowledge, and experience, they
    believed that such packaging reflected a method used by individuals in
    drug trafficking to transport drug proceeds. They then arrested Grover.
    Given these facts, the district court did not err when it refused to sup-
    press the California evidence.
    8
    A.
    The direct evidence linking Harris to the charged conspiracy
    included (1) the June 1993 and July 1993 audio tapes of conversations
    between Washington and Walker with their references to "mailman,"
    "post office" and "dirt bikes" and (2) the testimony of Washington
    and Walker concerning Harris's participation in the charged conspir-
    acy. At trial, both Washington and Walker testified that "post office"
    meant Harris, and, on direct examination by the prosecution, Wash-
    ington testified that he was not dealing drugs with any mailman other
    than Harris. Also, while Walker failed to identify Harris by name in
    his initial debriefings with the DEA after his arrest in May 1993,
    Walker stated that Washington dealt drugs to a mailman.4
    Throughout trial Harris's defense was that he was completely inno-
    cent of any drug dealings with Washington and Walker. To establish
    that Harris was not the "post office" and to impeach Washington and
    Walker, counsel for Harris sought to introduce evidence that another
    postal employee, Moses Norfleet, had brokered a drug deal for Wash-
    ington in June 1991, a few months prior to the time the charged con-
    spiracy commenced. Evidently, Norfleet had arranged for Washington
    to sell a distributable quantity of cocaine to Troy Sneed.
    Defense counsel first attempted to elicit testimony from Washing-
    ton on cross-examination that he knew Norfleet. Washington denied
    knowing Norfleet. Next, defense counsel attempted to show that Nor-
    fleet was a postal employee and that Norfleet had brokered a sale of
    cocaine for Washington. The latter was to be established through the
    testimony of Police Detective Edward J. Fox, Jr. of the Baltimore City
    Police Department. Detective Fox had arrested Washington in con-
    nection with the sale.
    The district court denied defense counsel's request to introduce the
    testimony of Detective Fox because (1) the prosecution had not intro-
    duced evidence connecting Harris to the transaction with Norfleet; (2)
    at most, the evidence was impeachment to show that Walker was talk-
    _________________________________________________________________
    4 When Special Agent Silk of the DEA debriefed Walker in May 1993,
    he surmised that Harris was the mailman to whom Walker was referring
    because there were records of multiple telephone calls between Harris
    and Washington.
    9
    ing about Norfleet when he was first debriefed; and (3) the issue was
    actually brought into the case through the cross-examination of
    Walker. Thus, according to the district court, the evidence was irrele-
    vant and improper impeachment.
    Again, we review the district court's decision to admit (or exclude)
    evidence for abuse of discretion. Moreover, while the Constitution
    guarantees a defendant "the right to put before a jury evidence that
    might influence the determination of guilt," Pennsylvania v. Ritchie,
    
    480 U.S. 39
    , 56 (1987), such evidence must be both relevant and
    admissible. United States v. Powers, 
    59 F.3d 1460
    , 1470 (4th Cir.
    1995), cert. denied, 
    116 S. Ct. 784
     (1996).
    The evidentiary issue presented here raises questions involving
    dual relevancy, impeachment evidence, and collateral evidence. As
    we have explained, evidence is relevant under Federal Rule of Evi-
    dence 401 if it has "any tendency to make the existence of any fact
    that is of consequence to the determination of the action more proba-
    ble or less probable than it would be without the evidence." Evidence
    has dual relevance if it admissible for more than one purpose. There-
    fore, when such evidence is inadmissible for one of its intended pur-
    poses, that fact does not necessarily render the evidence inadmissible
    for the other purpose. For example, while extrinsic evidence offered
    to impeach the credibility a witness is inadmissible under Federal
    Rule of Evidence 608(b),5 if such evidence is also relevant and admis-
    sible for some other purpose, then it may be introduced. See, e.g.,
    United States v. Abel, 
    469 U.S. 45
    , 56 (1984) ("It would be a strange
    rule of law which held that relevant, competent evidence which
    tended to show bias on the part of a witness was nonetheless inadmis-
    sible because it also tended to show that the witness was a liar.");
    _________________________________________________________________
    5 Rule 608(b) provides in pertinent part:
    (b) Specific instances of conduct. Specific instances of the
    conduct of a witness, for the purpose of attacking or supporting
    the witness' credibility, other than conviction of crime as pro-
    vided in Rule 609, may not be proved by extrinsic evidence.
    They may, however, in the discretion of the court, if probative
    of truthfulness or untruthfulness, be inquired into on cross-
    examination of the witness (1) concerning the witness' character
    for truthfulness or untruthfulness . . . .
    10
    United States v. Smith Grading and Paving, Inc., 
    760 F.2d 527
    , 531
    (4th Cir.) ("Rule 608(b) should not be read so broadly as to disallow
    the presentation of extrinsic evidence that is probative of a material
    issue in a case."), cert. denied, 
    474 U.S. 1005
     (1985).
    While falling within Rule 608(b), impeachment by contradiction is
    evidence that has dual relevance. It is offered not only to impeach the
    credibility of a witness but it is also offered to prove some material
    fact at issue in the case, or it is independently admissible to impeach
    by showing such things as bias. See 3 Jack B. Weinstein & Margaret
    A. Berger, Weinstein's Evidence ¶ 608[05], at 608-50 to 608-54
    (1995) (commenting that "[c]ounsel and courts sometimes have diffi-
    culty in distinguishing between Rule 608 impeachment and impeach-
    ment by contradiction"). District courts should, however, exclude
    extrinsic evidence which seeks to impeach by contradiction when the
    fact that the evidence supports or undermines is collateral or irrele-
    vant to the material issues in the case. See, e.g., United States v.
    Koziniski, 
    16 F.3d 795
    , 805-07 (7th Cir. 1994) (finding no abuse of
    discretion when district court excluded extrinsic evidence that
    attempted to provide background information on drug conspiracy
    when true purpose of evidence was to show that witness was a liar);
    United States v. Phillips, 
    888 F.2d 38
    , 41-42 (6th Cir. 1989) (finding
    no abuse of discretion when district court excluded extrinsic evidence
    showing bias of Government witnesses because evidence involved a
    remote matter unrelated to the charges against the defendant); United
    States v. Ling, 
    581 F.2d 1118
    , 1120-21 (4th Cir. 1978) (reversible
    error for district court to admit extrinsic evidence that was collateral
    to the charges upon which the defendant was accused and which was
    offered to attack the credibility of the defendant). See also United
    States v. Tate, 
    715 F.2d 864
    , 865 n.2 & 866 (4th Cir. 1983) (revers-
    ible error for district court to admit extrinsic evidence that defendant
    possessed a different gun on a previous occasion because such evi-
    dence was not relevant to issue of whether defendant knew he was
    carrying guns in the trunk of his wife's car).
    Here, to the extent that defense counsel sought to introduce the tes-
    timony of Detective Fox in order to impeach the credibility of Wash-
    ington and Walker, Rule 608(b) clearly precludes its admission.
    While defense counsel was free to ask both Washington and Walker
    on cross-examination whether they had dealt with postal employees
    11
    other than Harris in an attempt to undermine their credibility, once
    Washington and Walker testified to the contrary, defense counsel
    could not introduce extrinsic evidence solely for the purposes of
    impeachment. Indeed, so long as the proffered testimony of Detective
    Fox involved matters collateral or irrelevant to the material issues in
    the case, the district court could exclude such testimony even though
    the Government had asked Washington on direct examination if he
    had dealt with mailmen other than Harris.
    Accordingly, we must answer whether the testimony of Detective
    Fox is relevant for the purpose of showing that when Washington and
    Walker discussed giving drugs to the "post office" in July 1993, they
    meant someone other than Harris. Likewise, we must answer whether
    such evidence is relevant for purposes of showing that when Walker
    mentioned a postal worker in his initial debriefings in May 1993, he
    meant someone other than Harris.
    As to both these questions, we are dealing with material issues in
    the case. In fact, the district court did not rule that these questions
    raise collateral matters. And given the emphasis that the prosecution
    placed on the tape recording at trial, it would be nonsensical (and
    inconsistent) to argue that identification of the"post office" was a col-
    lateral matter.
    We are thus left with a pure issue of relevancy and that is an issue
    to which we must accord the district court's decision particular defer-
    ence. See Powers, 
    59 F.3d at 1470
    . The transaction involving Wash-
    ington and Norfleet occurred approximately two years prior to both
    the taped conversations between Washington and Walker and Walk-
    er's initial debriefing with the DEA. Moreover, the transaction
    occurred prior to the time that Washington became involved in Kenny
    Dorsey's drug enterprise, and there is no contention made that the
    transaction had anything whatsoever to do with the charged conspir-
    acy. The latter fact distinguishes the issue presented here from the one
    presented in Part II, supra. Accordingly, given the deference that we
    must accord the district court's evidentiary rulings, we cannot say that
    the district court abused its discretion.
    B.
    Defense counsel also attempted to attack the credibility of Wash-
    ington, Walker, and other Government witnesses by drawing the
    12
    jury's attention to the various plea agreements entered into with the
    Government. Cross-examination of this kind is, of course, entirely
    proper and expected. Equally proper is the Government's right to
    establish a witness's credibility in the face of such an attack. How-
    ever, in a part of his closing argument to the jury, the prosecutor over-
    stepped his bounds and told the jury that:
    I am going to make a pitch to the judge at sentencing. They
    testified truthfully, they upheld their end of the bargain, and
    I am going to uphold my end of the bargain. I respect that.
    Somebody that is willing to do that, I think that they should
    get something from me and they are. I am not hiding that
    from you.
    ****
    You can talk about the evidence in a case like this, you
    get your head hanged (sic) to you. Best thing to do[if you
    are the defense] is circle it, attack the people, attack the drug
    dealers, they are bad, they are bad, they are bad. I am telling
    you they are bad, but they are not liars. Too much to lose
    to lie.
    ****
    I tell you what I did about the discrepancies [in the testi-
    mony]. I didn't hide them from you. Remember, there are
    only three people in this courtroom that knew what all the
    witnesses were going to say. Remember they all met with
    the government.
    I knew Michael Walker believed this. I knew Tracy
    Washington denied it. I let it all hang out. I certainly could
    have said, well, Tracy, don't you think that maybe you took
    it. No. Don't do that. I don't hide it from you. Good, bad,
    pretty, ugly. You heard it. I could have orchestrated it. That
    would have been wrong. Could have orchestrated it. Didn't
    orchestrate it. Won't orchestrate it. Didn't do it. Let it all
    hang out.
    13
    ****
    Witnesses are not liars, they are telling the truth.
    At the time these statements were made defense counsel failed to
    object. Counsel now contends on appeal that the statements constitute
    improper vouching requiring that the defendants be given a new trial.
    Because counsel failed to object at trial, our review is limited to a
    "plain error" inquiry under Rule 52(b) of the Federal Rules of Crimi-
    nal Procedure.6 According to the Government, no such error occurred
    here because the prosecutor's statements did not lead to a miscarriage
    of justice or substantial prejudice to the defendants. As for Dorsey
    and Grover, we agree that the vouching did not amount to plain error
    because ample evidence of guilt exists independent of the vouched-
    for testimony to warrant the conclusion that their convictions were
    permissibly obtained. As for Harris, our analysis must be more
    detailed because the evidence against him primarily came from the
    testimony of Washington and Walker. Nonetheless, we conclude that
    the prosecutor's statements did not deprive Harris of a fair trial, and
    we therefore decline to reverse his conviction under Rule 52(b).
    In United States v. Olano, 
    113 S. Ct. 1770
    , 1776-78 (1993), the
    Supreme Court defined plain error under Rule 52(b) as (1) error (2)
    that is plain and (3) affects substantial rights. The Supreme Court also
    made clear that because it is the defendant who has failed to make a
    timely objection at trial, it is the defendant who bears the burden of
    persuasion with respect to prejudice. Id. at 1178. In addition, because
    Rule 52(b) is permissive, a reviewing court should exercise its discre-
    tion to correct such an error only when the error"seriously affect[s]
    the fairness, integrity or public reputation of judicial proceedings." Id.
    at 1779 (quoting United States v. Atkinson, 
    297 U.S. 157
    , 160
    (1936)); see United States v. Floresca, 
    38 F.3d 706
    , 712 (4th Cir.
    1994) (en banc). Accordingly, we must not take the prosecutor's
    _________________________________________________________________
    6 Rule 52(b) provides that:
    Plain Error. Plain errors or defects affecting substantial rights
    may be noticed although they were not brought to the attention
    of the court.
    14
    statements in isolation, but rather, "we must review the entire pro-
    ceedings to see if the misconduct undermined the trial's fundamental
    fairness." United States v. Adam, 
    70 F.3d 776
    , 780 (4th Cir. 1995)
    (citing United States v. Mitchell, 
    1 F.3d 235
    , 240 (4th Cir. 1993)); see
    United States v. Young, 
    470 U.S. 1
    , 16 (1985). 7
    Likewise, with respect to claims of prosecutorial misconduct (of
    which vouching is a subset), a defendant "must show that the remarks
    were improper and that they "prejudicially affected the defendant's
    substantial rights so as to deprive the defendant of a fair trial.'" Adam,
    
    70 F.3d at 780
     (quoting Mitchell, 
    1 F.3d at 240
    ); see United States v.
    Francisco, 
    35 F.3d 116
    , 120 (4th Cir. 1994), cert. denied, 
    115 S. Ct. 950
     (1995); United States v. Brockington, 
    849 F.2d 872
    , 875 (4th Cir.
    1988). There are several factors relevant to the determination of prej-
    udice, including:
    (1) the degree to which the prosecutor's remarks have a ten-
    dency to mislead the jury and to prejudice the accused; (2)
    whether the remarks were isolated or extensive; (3) absent
    the remarks, the strength of competent proof introduced to
    establish the guilt of the accused; and (4) whether the com-
    ments were deliberately placed before the jury to divert
    attention to extraneous matters.
    Adam, 
    70 F.3d at 776
     (quoting United States v. Harrison, 
    716 F.2d 1050
    , 1052 (4th Cir. 1983), cert. denied, 
    466 U.S. 972
     (1984)). Courts
    should also determine whether the remarks were invited, Young, 
    470 U.S. 1
    , 12-13, and examine the remedial effect of any curative
    instruction provided at trial. See Harrison, 
    716 F.2d at 1053
    . See also
    United States v. Valez, 
    46 F.3d 688
    , 691 (7th Cir. 1995) (citing
    Darden v. Wainwright, 
    477 U.S. 168
    , 182 (1986)); Mitchell, 1 F.3d
    _________________________________________________________________
    7 Although the Government argues that plain error should not be cor-
    rected unless it results in a miscarriage of justice, to the extent that such
    a standard requires the showing of actual innocence, the law is to the
    contrary. Olano, 
    113 S. Ct. at 1779
     ("The Court of Appeals should no
    doubt correct a plain forfeited error that causes the conviction or sentenc-
    ing of an actually innocent defendant, but we have never held that a Rule
    52(b) remedy is only warranted in cases of actual innocence.") (emphasis
    in original; citation omitted).
    15
    at 242-43. Again, the overriding issue is whether the prosecutorial
    misconduct denied the defendant a fair trial.
    1.
    In this case, there is no question that the prosecutor's statements
    are clear, unequivocal examples of vouching for the credibility of
    Government witnesses. Indeed, it is hard to imagine some other pur-
    pose for the prosecutor telling the jury that: "I am going to make a
    pitch to the judge at sentencing. [The witnesses] testified truthfully,
    they upheld their end of the bargain, and I am going to uphold my end
    of the bargain. I respect that." "I am telling you they are bad, but they
    are not liars. Too much to lose to lie." The"[w]itnesses are not liars,
    they are telling the truth."
    Furthermore, the prosecutorial remarks in this case did not stop at
    merely seeking to vouch for the credibility of the Government wit-
    nesses. The prosecutor specifically called the jury's attention to his
    own credibility, arguing that he would not "orchestrate" the witnesses'
    testimony: "Remember, there are only three people in this courtroom
    that knew what all the witnesses were going to say. Remember they
    all met with the government." "I don't hide it from you. Good, bad,
    pretty, ugly. You heard it. I could have orchestrated it. That would
    have been wrong. Could have orchestrated it. Didn't orchestrate it.
    Won't orchestrate it. Didn't do it. Let it all hang out."
    Taken together, the potential effect of statements of this kind are
    twofold. First, they tell the jury that it does not need to determine the
    credibility of the Government witnesses because the prosecutor has
    already independently determined that "they are not liars." And sec-
    ond, they tell the jury that in order to disbelieve the Government wit-
    nesses it must also disbelieve the prosecutor because he (the
    prosecutor) "[d]idn't orchestrate it."
    We think that it is indisputable that the prosecution's statements
    were improper and amount to error that is plain. See, e.g., United
    States v. Lewis, 
    10 F.3d 1086
    , 1089 (4th Cir. 1993) ("Vouching gen-
    erally occurs when the prosecutor's actions are such that a jury could
    reasonably believe that the prosecutor was indicating a personal belief
    in the credibility of the witness."); United States v. Roberts, 
    618 F.2d 16
    530, 537 (9th Cir. 1980) ("The prosecution may not portray itself as
    a guarantor of truthfulness"). We must therefore turn to the question
    of whether the prosecutor's vouching deprived Harris of a fair trial.
    2.
    We emphasize at the outset that the vouching in this case was both
    isolated and invited to the extent that it was in response to credibility
    attacks made on the Government witnesses during the course of the
    trial. Indeed, the vouching encompassed only a small portion of the
    prosecutor's entire closing argument to the jury and the thrust of that
    argument was that the evidence presented at trial established the
    defendants' guilt beyond a reasonable doubt. See Adam, 
    70 F.3d at 780
     (no plain error when, among other things, comments were iso-
    lated); United States v. Bethancourt, 
    65 F.3d 1074
    , 1080 (3d Cir.
    1995) (no plain error when prosecutor's remarks were isolated and
    marginal comments in the course of a short rebuttal summation), cert.
    denied, 
    116 S. Ct. 1032
     (1996).
    Moreover, counsel for Harris was able to respond to the prosecu-
    tor's statements in her closing argument. In particular, counsel for
    Harris argued to the jury that:
    The government has told you, and [the prosecutor] told
    you, that these witnesses don't lie. He even told you that he
    personally respects Tracy Washington, personally respects
    him. And he wants you to accept their plea bargains as a
    government warranty that they won't lie.
    Ladies and gentlemen, this is a warranty that those scorpi-
    ons are not going to sting you. If the government gave you
    a piece of paper and said this is your warranty that a scor-
    pion will not sting you, would you pick up that scorpion and
    put it in your hand? Would you trust this paper to protect
    you from being stung by a scorpion? If you would not pick
    it up, if you would not pick up a scorpion, then don't let it
    sting Christopher Harris.
    Thus, defense counsel was able to make a direct challenge against the
    prosecutor's statements and to turn the statements to Harris's advan-
    tage. This served to minimize any prejudice.
    17
    Likewise, the district court's general instructions to the jury helped
    minimize any prejudice that the Harris may have suffered. As the dis-
    trict court judge told the jury:
    In deciding the facts, you must rely upon your own recollec-
    tion of the evidence. What the lawyers have said in their
    opening statements and what they will say in their closing
    arguments, what they have said in their objections or their
    questions is not evidence.
    The district court judge also instructed the jury to"examine the testi-
    mony of a cooperating witness with caution and weigh it with great
    care." While we think that general instructions of this kind do not
    automatically cure any prejudice that resulted from improper prosecu-
    torial remarks, such instructions do make clear to the jury that it--not
    the prosecutor--must weigh the evidence.8
    We also think that the evidence of guilt offered against Harris was
    substantial, even though it was not as great as the evidence offered
    against either Dorsey or Grover.9 As we have discussed, a key point
    of contention at trial was whether Harris was the"post office" referred
    to by Washington and Walker in their July 1993 conversation about
    _________________________________________________________________
    8 Of course, because defense counsel failed to object to the prosecu-
    tion's improper remarks, the district court judge did not provide a spe-
    cific curative instruction to the jury.
    9 The evidence against both Dorsey and Grover was compelling even
    in the absence of the vouched-for testimony. For instance, Dorsey was
    recorded on video tape selling crack cocaine to Walker. As for Grover,
    he was arrested while carrying $154,000 in drug proceeds. The improper
    vouching did not therefore deny Dorsey and Grover their right to a fair
    trial.
    18
    drugs. At trial both Washington and Walker testified that Harris was
    the "post office," and, accordingly, the jury could reasonably believe
    this to be true. Nonetheless, the essence of Harris's claim of prejudice
    is that the jury may have relied upon the vouching of the prosecutor
    to reach the conclusion that Washington and Walker were not liars
    and that Harris was the "post office" discussed in their conversation.
    However, having reviewed the record in this case, it is clear that
    evidence was presented to the jury from which it could find that Har-
    ris was the "post office" even absent the testimony of Washington and
    Walker. In the June 1993 telephone conversation between Washing-
    ton and Walker, Harris was driving the car when Walker asked Wash-
    ington if he had the "mailman" with him and Washington responded
    that he did. Washington and Walker then joked about how "Chris"
    (i.e., Christopher Harris) drives like a mailman. From this undisputed
    evidence, the jury could reasonably infer that Harris was not only the
    "mailman" but that he was also the "post office" discussed in the July
    1993 conversation, and the jury could make this inference even with-
    out relying upon the testimony of Washington and Walker.10
    _________________________________________________________________
    10 The text of the June 1993 conversation between Washington and
    Walker was:
    WASHINGTON:          (Talking to someone in the background)
    . . . up on the beltway. Hun? Oh yea
    (inaudible) . . . right here. Need to go right
    here? (Inaudible) on the beltway and get
    off on Liberty.
    WALKER:              What you got the mailman with you?
    WASHINGTON:          Yeah.
    WALKER:              Yeah.
    WASHINGTON:          He can't drive worth a [expletive deleted].
    He drive like a God damn mailman. You
    know what I mean? Hey, my uh, he drive
    like a God damn mailman.
    WALKER:              What? Tell Chris supposed to drive that
    like he drive the Z.
    19
    In sum, we hold that based on the evidence presented against Har-
    ris, the limited nature of the prosecutor's vouching, defense counsel's
    responsive argument to the jury, and the general instructions provided
    by the district court judge, Harris has failed to meet his "burden of
    persuasion with respect to prejudice." Olano , 
    113 S. Ct. at 1178
    .
    When the record is considered as a whole, Harris simply was not
    deprived of a fair trial. He therefore cannot rely upon Rule 52(b) to
    excuse his failure to object to the prosecutor's vouching.
    We emphasize, however, that the Government should not take this
    decision as a license to resort to argument such as that made by the
    prosecutor in this case. Even though Harris cannot satisfy his burden
    under Rule 52(b), the prosecutor's vouching was simply improper.
    C.
    Harris also claims that it was error for the district court to refuse
    his request that the jury be instructed that a mere buyer-seller relation-
    ship is insufficient to establish a conspiracy and an individual's par-
    ticipation in it. While we agree with the premise, we disagree with its
    application in this case.
    Throughout the trial Harris's defense was that the Government wit-
    nesses were lying and that he had absolutely no involvement in the
    charged conspiracy. He took the stand in his own defense and claimed
    that he never purchased or sold any drugs, in any quantities, from or
    on behalf of either Washington or Walker. That is, he did not urge the
    jury to find him innocent of the conspiracy charge because he merely
    purchased drugs from Washington and Walker.11
    _________________________________________________________________
    11 Harris's testimony is explicitly clear:
    Q. Chris, have you ever bought cocaine from Tracy Washing-
    ton?
    A. No.
    Q. Have you ever been given cocaine by Tracy Washington?
    A. No.
    Q. Have you ever been given cocaine by Michael Walker?
    20
    In keeping with this defense, counsel for Harris did not request a
    "buyer-seller" instruction.12 However, during the first day of jury
    deliberations, the jury requested guidance on whether the act of distri-
    bution is necessary to establish a conspiracy. The jury also asked for
    the definition of the word "participation" as it relates to the charge of
    conspiracy. Counsel for Harris then requested that the district court
    provide an instruction explaining that a mere buyer-seller relationship
    does not constitute evidence to support a conviction for conspiracy.
    The district court refused.13
    _________________________________________________________________
    A. No.
    Q. Have you ever sold cocaine?
    A. No.
    ...
    Q. Did you ever help Tracy Washington sell cocaine?
    A. No, I didn't.
    Q. Did you ever sell cocaine for Tracy Washington?
    A. No, I have not.
    12 A buyer-seller instruction informs the jury that the mere purchase
    and sale of narcotics is standing alone insufficient evidence upon which
    to establish a conspiracy to distribute narcotics. See United States v.
    Mills, 
    995 F.2d 480
    , 485 & n.1 (4th Cir.), cert. denied, 
    114 S. Ct. 283
    (1993).
    13 Instead, the court instructed the jury that:
    A conspiracy is an agreement, knowingly and voluntarily
    entered into to commit an illegal act. Thus, it is the agreement
    itself that is illegal.
    The object of the conspiracy need not be carried out for the
    conspiracy to exist. In count one of the indictment, the conspir-
    acy charged is an agreement to distribute cocaine or cocaine
    base. Thus, to prove a defendant guilty the government must
    establish beyond a reasonable doubt that the defendant in ques-
    tion joined a conspiracy and that the defendant understood the
    objective of the conspiracy joined was to distribute cocaine or
    cocaine base. But the government need not prove that cocaine or
    cocaine base was actually distributed as part of the conspiracy.
    21
    On appeal the Government argues that the court properly refused
    to give the requested instruction because (1) Harris never advanced
    the "buyer-seller" defense at trial and (2) the district court's conspir-
    acy instruction substantially covered the point. In light of the facts in
    this case, we agree with the Government on both arguments.
    A district court's decision not to give a requested instruction is
    reviewed for abuse of discretion, and a district court's refusal to pro-
    vide a requested instruction constitutes reversible error only if the
    instruction: (1) was correct; (2) was not substantially covered by the
    court's charge to the jury; and (3) dealt with some point in the trial
    so important that failure to give the instruction seriously impaired the
    defendant's ability to conduct his defense. United States v. Lewis, 
    53 F.3d 29
    , 32 (4th Cir. 1995); see United States v. Gray, 
    47 F.3d 1359
    ,
    1369 n.13 (4th Cir. 1995) ("Although the district court may provide
    an instruction if the evidence supports it, a defendant is not entitled
    to a particular instruction unless he or she advances the relevant the-
    ory at trial.") (emphasis in original; citation omitted).
    As we have explained, Harris did not urge the jury to find him
    innocent of the conspiracy charge because he merely purchased drugs
    from Washington or Walker. Accordingly, even though the requested
    buyer-seller instruction is correct as a matter of law, the district court
    did not abuse its discretion when it refused to provide the instruction.
    Also, because the testimony of Washington and Walker showed
    that Harris received distributable quantities of drugs on a regular
    basis, we agree that the district court's conspiracy instruction substan-
    _________________________________________________________________
    As for the definition of the word "participation," the court instructed
    the jury that:
    A defendant with an understanding of the unlawful character
    of the conspiracy must have intentionally engaged, advised or
    assisted in it for the purpose of furthering illegal undertaking. He
    thereby becomes a knowing and willing participant in the unlaw-
    ful agreement, and he must become a participant by intentionally
    engaging, advising or assisting in the conspiracy for the purpose
    of furthering the illegal undertaking.
    22
    tially covered the point. See Mills, 
    995 F.2d at 485
     (no error when dis-
    trict court refused to give buyer-seller instruction because evidence
    showed that defendant was far more than a mere buyer). Indeed, we
    noted in Mills that evidence of a buy-sell transaction, when coupled
    with a substantial quantity of drugs, would support a reasonable infer-
    ence that the parties were co-conspirators. 
    995 F.2d at
    485 n.1. Cf.
    United States v. Townsend, 
    924 F.2d 1385
    , 1394 (7th Cir. 1991)
    ("The mere purchase or sale of drugs (even in large quantities) does
    not demonstrate an agreement to join a drug distribution conspiracy").
    Accordingly, it was not an abuse of discretion for the district court to
    refuse to give the buyer-seller instruction in this case.
    IV.
    Charles Grover has also appealed his sentence. He claims that the
    district court erred when it refused to grant a reduction of his sentence
    under section 3B1.2(b) of the Sentencing Guidelines because, accord-
    ing to Grover, he was a minor participant in the drug conspiracy. In
    addition, Grover claims that the district court erred when it adjusted
    his sentence upward under section 2D1.1(b)(1) of the Sentencing
    Guidelines based on the firearms discovered at Grover's residence
    upon his arrest in August of 1993. We reject both of Grover's claimed
    sentencing errors.
    A.
    The defendant bears the burden of proving by a preponderance of
    the evidence that he is entitled to a reduction in sentence. United
    States v. Nelson, 
    6 F.3d 1049
    , 1058 (4th Cir. 1993), cert. denied, 
    114 S. Ct. 2142
     (1994). And because a defendant's role in the offense is
    a factual question, we review a sentencing court's decision to deny a
    reduction in sentence for clear error. United States v. Reavis, 
    48 F.3d 763
    , 768-79 & n.1 (4th Cir.), cert. denied, 
    115 S. Ct. 2597
     (1995); 
    18 U.S.C. § 3742
    (e).
    Under section 3B1.2 of the Sentencing Guidelines, a sentencing
    court may reduce the offense level of a "minimal" or "minor" partici-
    pant in a conspiracy. Subsection 3B1.2(a) provides a four-level
    decrease in the offense level of a minimal participant. Subsection
    3B1.2(b) provides a two-level decrease in the offense level of a minor
    23
    participant. Application Notes 2 and 3 to the Commentary of section
    3B1.2 provide that:
    It is intended that the downward adjustment for a minimal
    participant will be used infrequently. It would be appropri-
    ate, for example, for someone who played no other role in
    a very large drug smuggling operation than to offload part
    of a single marihuana shipment, or in a case where an indi-
    vidual was recruited as a courier for a single smuggling
    transaction involving a small amount of drugs.
    For purposes of § 3B1.2(b), a minor participant means any
    participant who is less culpable than most other participants,
    but whose role could not be described as minimal.
    Grover concedes that he was not a minimal participant in the drug
    conspiracy. Essentially, Grover recognizes that he does not fall within
    subsection 3B1.2(a) because he acted as a courier on multiple occa-
    sions carrying large amounts of drugs. However, Grover argues that
    because his role was limited to that of a courier and he only carried
    eight kilograms of the eighty kilograms of crack cocaine distributed
    during the course of the conspiracy, he is less culpable than other
    members of the conspiracy and is thus entitled to a reduction under
    subsection 3B1.2(b).
    In United States v. Reavis, this circuit rejected a defendant's claim
    that she should have been classified as either a minimal or minor par-
    ticipant holding that courts "not only compare the defendant's culpa-
    bility to that of other participants, but also ``measure each participant's
    individual acts and relative culpability against the elements of the
    offense of conviction.'" 
    48 F.3d at 769
     (quoting United States v.
    Daughtrey, 
    874 F.2d 213
    , 216 (4th Cir. 1989)).
    Here, while Grover only acted as a courier for one tenth of the
    drugs distributed during the course of the conspiracy, he still carried
    large quantities of cocaine (eight kilograms in total), making three
    trips from California to Maryland. Based on nothing more than the
    eight kilograms that he carried, Grover knew that he was part of a
    large drug conspiracy. Moreover, because he carried a significant
    amount of drugs on multiple occasions, Grover knew that he was a
    24
    trusted member of the conspiracy and that he had an important and
    ongoing role in the conspiracy. Evidence that Grover's role was lim-
    ited to that of a courier does not diminish the fact that he was person-
    ally responsible for the delivery of large quantities of drugs on
    multiple occasions. Indeed, this is not a case where the defendant car-
    ried small amounts of drugs on multiple occasions, nor is this a case
    where a defendant carried a large quantity of drugs on a single occa-
    sion. Therefore, we hold that the district court did not err when it
    rejected Grover's claim that he was a "minor" participant entitled to
    a reduction of sentence.
    B.
    The district court also properly enhanced Grover's sentence for
    possession of firearms during the conspiracy. Section 2D1.1(b)(1) of
    the Sentencing Guidelines states that "if a dangerous weapon (includ-
    ing a firearm) was possessed, increase by 2 levels." Application Note
    3 to the Commentary provides that:
    The adjustment should be applied if the weapon was pres-
    ent, unless it is clearly improbable that the weapon was con-
    nected with the offense. For example, the enhancement
    would not be applied if the defendant, arrested at his resi-
    dence, had an unloaded hunting rifle in his closet.
    The Government bears the burden of proving by a preponderance
    of the evidence that the weapons were possessed during the commis-
    sion of the offense. United States v. Calhoun , 
    49 F.3d 231
    , 236 (6th
    Cir. 1995). If established, then Grover must show that it is clearly
    improbable that the weapons were connected with the offense. 
    Id.
    Again, this court reviews the district court's decision for clear error.
    United States v. Apple, 
    915 F.2d 899
    , 914 (4th Cir. 1990).
    In this case, three firearms were found at Grover's residence. To
    be specific, police found an APM 9mm semi-automatic handgun, a
    Colt semi-automatic handgun, an Orson semi-automatic handgun, and
    ammunition for all firearms. In Grover's residence, police also found
    tools consistent with Grover's role as a drug courier in the narcotics
    enterprise--that is, fabric softener, suitcases, and tape.
    25
    From this evidence the district court logically inferred that Gro-
    ver's residence was used, at the very least, to store tools of the drug
    trade and that the firearms were possessed during the commission of
    the offense. In addition, the district court logically inferred that in his
    capacity as a drug courier Grover possessed the firearms to protect
    money or drugs while such money or drugs were kept at Grover's res-
    idence. While Grover complains that neither drugs nor drug money
    were found at his residence and that the Government could not point
    to specific instances when drugs or drug money were kept at his resi-
    dence, Grover has failed to show that it is clearly improbable that the
    weapons were connected with the offense. Needless to say, unlike an
    unloaded hunting rifle, one does not possess an APM 9mm semi-
    automatic handgun, a Colt semi-automatic handgun, and an Orson
    semi-automatic handgun in order to take advantage of deer season.
    V.
    Based on the foregoing, we affirm the conviction and sentence of
    defendant Charles Grover and the convictions of defendants Charles
    Dorsey and Christopher Harris.
    AFFIRMED
    26