In this appeal we address the joint-participant exception to the marital communications privilege, the propriety of a prosecutor’s remarks to the jury during closing argument, and the requirements necessary to support a sentencing enhancement for the defendant’s role as a supervisor of criminal activity. Discerning no reversible error, we affirm the defendant-appellant’s convictions and sentence for importing cocaine into the United States.
BACKGROUND
Joseph Bey, Jr. stood trial on six counts of importing cocaine into the United States, in violation of 21 U.S.C. § 952(a), one count of conspiring to import cocaine, in violation of 21 U.S.C. § 963, and one count of attempting to import cocaine, also in violation of 21 U.S.C. § 963. At trial, the government presented evidence that showed Bey recruited a number of unsuspecting couriers to transport large amounts of cocaine, diluted in bottles of alcohol, from Jamaica to the United States. Bey would recruit one or two persons at a time to assist him in filming various documentary films in Jamaica. Although the recruits typically had no experience in this type of work, Bey convinced them that the work was easy, that he would train them, and that he would pay for all their expenses on the trip. Once in Jamaica, the recruits would take part in minimal filming with equipment that frequently did not work and spend the remainder of their *4 time on vacation. When the recruits returned to the United States, Bey or someone else would give each recruit three bottles and ask them to take the bottles to John Moore or Vasco Harriott in the United States. Under the impression that the bottles contained only rum or wine for Bey’s friends at home, the recruits would agree and bring the bottles into the United States. In fact, the bottles contained a solution of alcohol and cocaine.
Bey’s defense at trial was that he was unaware of the real contents of the bottles and that he believed Moore legitimately was interested in the documentary work for which Moore had hired him. Moore testified for the government in return for promises of leniency; his credibility, therefore, was an issue at trial. The government also presented the testimony of Bey’s wife, Catherine Bey, over Bey’s objection. Catherine Bey testified that Bey was a knowing participant in the scheme to import cocaine.
DISCUSSION
On appeal, Bey, through counsel, argues that the government violated the marital communications privilege by forcing Bey’s wife, Catherine Bey, to testify regarding confidential marital communications. He also argues that the prosecutor made a number of errors during the government’s closing argument that require us to reverse his convictions. Additionally, Bey filed a supplemental pro se brief in which he added to his counsel’s arguments 1 and raised several additional challenges to his convictions and sentence, only one of which — regarding the district court’s calculation of his sentence — merits extended discussion. 2
I. Marital Communications Privilege
The marital communications privilege permits a federal criminal defendant to bar his or her spouse from testifying regarding confidential communications that took place during the marriage.
See United States v. Picciandra,
We review a claim that the district court erroneously admitted testimony at trial in derogation of an evidentiary privilege for an abuse of discretion.
See United States v. Reeder,
The government must produce evidence of a spouse’s complicity in the underlying, on-going criminal activity before the district court may admit testimony regarding confidential communications between the defendant and the spouse. The spouse’s involvement in the criminal activity, however, need not be particularly substantial to obviate the privilege.
See, e.g., Short,
During voir dire in the case at bar, Catherine Bey testified that she engaged in a number of acts similar to those described above and thus implicated herself as a joint participant in Bey’s conspiracy to import cocaine. 3 Catherine Bey testified that she knew the purpose of Bey’s trips to Jamaica before he traveled there the first time. With that knowledge and despite her testimony that she sought to discourage Bey from engaging in criminal acts, Catherine Bey drove Bey to the bus stop so that he could travel to Jamaica, wired Bey money for his personal use while he was abroad, and knowingly accepted drug proceeds upon Bey’s return from each trip. Catherine Bey also testified that she knew John Moore was part of the drug conspiracy, that she relayed messages from Moore to her husband, and that she contacted Moore at Bey’s request so that Moore could send “expense money” to Bey in Jamaica. She further testified that she maintained Bey’s cover story regarding the documentary expeditions in her conversations with various couriers that Bey had recruited. Finally, Catherine Bey testified that she drove Bey to the bus station so that he could travel to Boston to pick up proceeds from his criminal activity. The government contends that each of these acts implicated Catherine Bey as a joint-participant.
*6
We observe no clear error in the district court’s decision that Catherine Bey became a joint participant in the criminal activity. In particular, Catherine Bey’s knowing acceptance of drug proceeds, her efforts to maintain Bey’s cover story for the benefit of his unsuspecting couriers, and her decision to act as a go-between when Bey needed additional funds from Moore to conduct his criminal activity in Jamaica satisfy us that Catherine Bey became a joint participant in the drug conspiracy.
See Short,
We reject, however, the government’s contention that the other conduct to which Catherine Bey admitted also constitutes evidence of joint-criminal activity. For example, Catherine Bey’s admissions that she provided phone messages to Bey, wired food money to Bey in Jamaica,
4
and drove Bey to the bus station, could be evidence of nothing more than the mundane incidents of their marital relationship. Proof of a criminal conspiracy requires an act “in furtherance of the conspiracy,”
see Ammar,
Finally, Bey argues that the district court should have limited Catherine Bey’s testimony regarding her confidential marital communications to only the events in which she was a co-conspirator. Our review of the case law, however, reveals that a court may admit relevant confidential marital communications that take place after the spouse has become a joint participant in the criminal activity.
See Short,
II. The Prosecutor’s Closing Argument
Bey also challenges the manner in which the trial prosecutor conducted the closing argument on the government’s behalf. Bey argues that the prosecutor improperly vouched for the credibility of a government witness and erroneously referred to certain factual matters as undisputed. As Bey failed to object at trial to the comments he now challenges on appeal, however, we review his claims
for
plain error.
See United States v. Olano,
*7 A. Prosecutorial Vouching
“[A] prosecutor may not place the prestige of the government behind a witness by making personal assurances about the witnesses] credibility;” nor may the prosecutor indicate that facts outside the jury’s cognizance support the testimony of the government’s witnesses.
United States v. Neal,
We detect no error in the prosecutor’s argument to the jury. In
United States v. Dockray,
Bey, however, argues that the prosecutor’s arguments insinuated a less innocent message to the jury. He contends that the comments indirectly suggested that the trial judge who presided over the trial already had concluded that Moore was credible. Although we are mindful that the cold transcript necessarily limits our ability to catch the potential nuances of the prosecutor’s remarks, Bey’s argument strains the prosecutor’s words too much. The prosecutor accurately told the jury that the trial judge, at some time in the future, would assess whether Moore had offered credible testimony but suggested nothing about what the trial judge already might have concluded. Moreover, even if we discerned any ambiguity in the prosecutor’s comments, we would be loath to attribute to the remarks the remote impli
*8
cations that Bey urges upon us.
See Donnelly v. DeChristoforo,
B. References to Evidence as Undisputed
Bey also finds fault with the prosecutor’s references to various matters as undisputed or beyond question, during closing argument. First, he argues that the prosecutor’s statements were inaccurate and may have misled the jury. Second, Bey contends that the remarks constituted improper commentary on his decision not to testify and encouraged the jury to draw an adverse inference from that decision. We reject both contentions.
The prosecutor’s closing argument attempted to narrow the issues for the jury’s consideration to the primary disputed question of whether Bey was aware of the cocaine importation scheme or genuinely believed he was in Jamaica to work on a filming project. To that end, the prosecutor told the jury that there was “no real question” that Bey had traveled to Jamaica four times in 1995, that Bey had not paid for his travel or accommodations on those trips, that Bey had recruited others to accompany him or meet him in Jamaica, that Bey told these recruits they would be helping him film a documentary, that the recruits had little or no filming experience, that the recruits did little or no work while in Jamaica, that each recruit received bottles to transport back to the United States, and that the bottles contained liquid cocaine. Bey argues that some of these points were very much in dispute and that the prosecutor’s comments erroneously may have suggested to the jury that Bey had stipulated those facts.
We review a claim that the prosecutor inaccurately stated the evidence to the jury during closing argument to determine “(1) whether the prosecutor’s conduct was isolated and/or deliberate; (2) whether the trial court gave a strong and explicit cautionary instruction; and (3) whether it is likely that any prejudice surviving the judge’s instruction could have affected the outcome of the case.”
United States v. Lowe,
Moreover, the district court explicitly cautioned the jury that it could not consider the arguments of counsel as evidence
*9
against Bey. In
Lowe
we found such an instruction sufficient to cure any potential prejudice that may have resulted from a prosecutor’s unintentional—but far more material—inaccurate restatement of the evidence during closing argument.
See Lowe,
Bey also argues that the prosecutor’s statements that there was no real question about the evidence on these matters constitutes an indirect comment on Bey’s decision not to testify at trial. A prosecutor violates the Fifth Amendment by commenting—either directly or indirectly—upon the defendant’s failure to testify in his or her own defense.
See United States v. Taylor,
54 F.Bd 967, 978 (1st Cir.1995). We have found such prohibited, indirect commentary in a prosecutor’s references to evidence as uncontradicted when the defendant was the only witness who could have provided any contradictory evidence.
See United States v. Flannery,
Again, Bey’s argument misses the broader context of the prosecutor’s closing remarks and the prosecutor’s attempt to focus the jury on the relevant issue.
See United States v. Lilly,
III. Sentencing
Bey’s pro se brief raises three challenges to the district court’s calculation of his sentence. We discern no error in the district court’s calculation of the quantity of cocaine attributable to Bey nor in the court’s decision to enhance Bey’s sentence for obstructing justice. Bey’s contention that the district court erred when it enhanced his sentence for his role as a supervisor of the criminal activity, however, merits a brief discussion.
The district court enhanced Bey’s offense level pursuant to U.S.S.G. § 3Bl.l(b) for his role as a supervisor in
*10
the drug conspiracy.
7
The commentary to section 3B1.1 explains that to qualify for an adjustment as a supervisor, the defendant must have exercised some control over “one or more other participants.” U.S.S.G. § 3B1.1, comment, (n.2);
see also United States v. Voccola,
Bey argues that because the evidence showed that the people he recruited to travel to Jamaica were unaware of the conspiracy to import cocaine, the couriers were not criminally responsible for bringing cocaine into the United States and therefore do not qualify as participants within the meaning of section 3B1.1. To the extent that Bey supervised mere “dupes,” unaware of the criminal activity, Bey’s argument is well taken.
Cf. United States v. Fuller,
Nevertheless, as we discussed in Part I, supra, Catherine Bey became a criminally responsible member of the conspiracy to import cocaine; she, therefore, was a participant in Bey’s criminal activity and Bey’s supervision of her would support the enhancement. It is of no matter that the government did not prosecute or convict Catherine Bey for her participation. See U.S.S.G. § 3B1.1, comment, (n.l). As a result, the district court correctly enhanced Bey’s sentence pursuant to section 3Bl.l(b).
CONCLUSION
After reviewing the record in this case and the arguments of both Bey and his counsel, we discern no reversible error. We conclude that the district court did not err when it admitted the testimony of Bey’s wife pursuant to the joint-participant exception to the marital communications privilege. We further hold that the prosecutor, during closing argument, did not impermissibly vouch for the credibility of the government’s witnesses nor indirectly comment upon Bey’s decision to exercise his Fifth Amendment right not to testify in *11 his own defense. Finally, we detect no error in the district court’s calculation of Bey’s sentence under the Guidelines.
Accordingly, we AFFIRM.
Notes
. Bey, both through counsel and
pro se,
presented a so-called
Singleton
claim, arguing that the district court should have excluded the testimony of government witnesses, particularly John Moore, who testified for the government in exchange for promises of lenience.
See generally United States v. Singleton,
. Bey adds three arguments attacking his conviction: (1) that the government failed to disclose exculpatory evidence in violation of
Brady v. Maryland,
. Our review of the relevant case law revealed no discussion of the quality of evidence required to sustain a finding that the testifying spouse was complicit in the defendant’s criminal activity. More particularly, the cases do not refer explicitly to probable cause or whether the evidence against the testifying spouse would support an indictment. We need not decide that issue to resolve this case, however, because Catherine Bey's personal admissions during voir dire provide evidence of sufficient factual quality to support her indictment and prosecution as long as the acts to which she admitted were of a criminal nature. We, therefore, need only resolve the narrow legal question of whether the acts to which Catherine Bey admitted implicated her in Bey’s criminal conspiracy.
. On this point, we draw a distinction between Catherine Bey's decision to wire relatively insignificant amounts of her own money to Bey to cover his personal needs and her decision to act as a go-between for Moore and Bey when Bey needed further funds to conduct his criminal activity in Jamaica.
. In relevant part, the prosecutor said:
Now, the other thing about Moore I want to mention is his plea agreement. That's in evidence. And if you have questions about that whole business, look at it carefully, paragraphs 5 and 6. He’s required to tell the truth. That is a part of the agreement and you can't ignore that. You can't separate that out. And who's going to make the determination about John Moore? Judge Keeton, the judge who sat here and listened to Moore’s testimony and listened to that testimony in relation to the other witnesses. He’s going to make a determination, Judge Keeton.
. Bey's counsel concedes that the prosecutor’s statements did not appear calculated to mislead the jury. Bey, in his pro se brief, retracts that admission and argues that the prosecutor's comments were part of a deliberate and vindictive scheme to prosecute him. As Bey offers no additional explanation or • argument to demonstrate that the prosecutor deliberately attempted to mislead the jury by referring to the essential events as undisputed, however, we cannot agree.
. Section 3B1.1 provides in relevant part:
Based on the defendant’s role in the offense, increase the offense level as follows:
(a) If the defendant was an organizer or leader of a criminal activity that involved five or more participants 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.
. Bey has not renewed his argument, made before the district court, that the government failed to show that the criminal activity involved five or more participants or was otherwise extensive. In any event, we find the argument to be without merit and will not address it further.
.
See also United States v. Hall,
