United States v. Lonnell Tucker ( 2021 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued April 9, 2021              Decided September 3, 2021
    No. 19-3042
    UNITED STATES OF AMERICA,
    APPELLEE
    v.
    LONNELL TUCKER,
    APPELLANT
    Consolidated with 19-3043, 19-3078
    Appeals from the United States District Court
    for the District of Columbia
    (No. 1:18-cr-00267-1)
    (No. 1:18-cr-00267-2)
    (No. 1:18-cr-00267-6)
    Paul S. Rosenzweig, appointed by the court, argued the
    cause for appellant Anthony Fields. Amelia Schmidt, appointed
    by the court, argued the cause for appellant Abdul Samuels.
    With her on the briefs was Matthew G. Kaiser, appointed by
    the court. Stephen C. Leckar, appointed by the court, argued
    the cause for appellant Lonnell Tucker.
    2
    Daniel J. Lenerz, Assistant U.S. Attorney, argued the
    cause for appellee. With him on the brief were Elizabeth
    Trosman, Chrisellen R. Kolb, and Gregory P. Rosen, Assistant
    U.S. Attorneys.
    Before: KATSAS, RAO, and WALKER, Circuit Judges.
    Opinion for the Court filed PER CURIAM.
    PER CURIAM: Appellants Anthony Fields, Abdul Samuels,
    and Lonnell Tucker were convicted on several drug- and
    firearm-related offenses. Each appellant challenges his
    convictions, and Samuels also challenges his sentence. We
    affirm.
    I
    In May 2018, a grand jury indicted Fields, Samuels,
    Tucker, and three other individuals on several charges related
    to an alleged drug-dealing conspiracy. The indictment
    stemmed from an investigation by the Bureau of Alcohol,
    Tobacco, Firearms and Explosives (ATF) of drug activity at
    Next Level Cuts, a barbershop in the District of Columbia.
    Much of the government’s evidence came from searches
    in the months preceding the indictment. During a traffic stop
    in November 2017, officers found what appeared to be a drug
    ledger, approximately $9,000, and drug paraphernalia in
    Fields’s vehicle. The ATF executed a search warrant on the
    barbershop three months later. In a suite above the barbershop,
    agents found cash, firearms, more drug paraphernalia, and
    large quantities of narcotics — heroin mixed with fentanyl,
    PCP, Suboxone, and synthetic marijuana. In the same room,
    they also found a document listing a medical appointment for
    Fields and a receipt for a purchase made with his credit card.
    A search of Fields’s home led to more drug ledgers, two of
    3
    which listed “Foots” (i.e., Samuels). During the ensuing
    searches of Samuels’s home, ATF agents found a shotgun, drug
    paraphernalia, crack cocaine, marijuana, and synthetic
    marijuana. During the search, Samuels admitted that he kept
    the gun under his bed for protection.
    Also central to the government’s case was testimony from
    Byran Clark, a drug dealer who purportedly worked for Fields.
    Clark testified that Fields ran a drug operation out of the
    barbershop’s upstairs suite and that Samuels often acted as a
    gatekeeper to the suite. He also reported that Tucker sold drugs
    out of the barbershop and frequented the suite.
    Five defendants proceeded to trial. One pleaded guilty
    during the trial. The jury returned a mixed verdict as to the
    other four. It acquitted one defendant on the sole charge
    against him. It also acquitted Fields and Samuels on several
    firearms- and narcotics-related charges. But it found Fields,
    Samuels, and Tucker guilty of conspiracy to distribute and
    possess with intent to distribute various narcotics. See 
    21 U.S.C. §§ 841
    , 846.1 It also found Fields guilty of possessing
    with intent to distribute each of the narcotics alleged in the
    conspiracy. 
    Id.
     § 841(a). And it found Samuels guilty of
    possessing with intent to distribute cocaine base, id., of
    possessing synthetic marijuana, id. § 844, and of felony
    possession of a firearm, 
    18 U.S.C. § 922
    (g).
    The district court sentenced Fields to 192 months of
    imprisonment, Samuels to 84 months of imprisonment, and
    1
    The jury found Fields guilty of conspiring to distribute PCP,
    heroin, fentanyl, buprenorphine, marijuana, and synthetic marijuana.
    Samuels was found guilty of conspiring to distribute heroin and
    fentanyl. And Tucker was found guilty of conspiring to distribute
    heroin.
    4
    Tucker to 60 months of imprisonment. All three appealed and
    collectively raise eight claims. We address each claim in turn.
    II
    We start with Fields, who contends that the police officers
    who searched him and his vehicle in November 2017 lacked a
    sufficient basis to conduct their traffic stop, violating the
    Fourth Amendment. Prior to the search, officers conducting
    undercover surveillance on a store known to sell drug
    paraphernalia witnessed Fields exit the store. The officers
    followed him. Fields drove to a nearby parking lot where
    another person entered Fields’s car and then left after less than
    two minutes. Suspecting a drug sale and wanting to remain
    undercover, the officers called for backup and followed Fields
    to another nearby parking lot.
    When backup officers arrived, they observed Fields
    illegally speed through that parking lot and then park. They
    momentarily observed Fields before they approached him and
    asked for his driver’s license and registration. “Due to his
    nervous behavior and furtive movements,” they then asked
    Fields to step out of his car and keep his hands away from his
    pockets. App. 145.
    Contrary to the instruction, Fields made “constant furtive
    movements towards his pockets.” 
    Id.
     So the backup officers
    conducted a pat down, during which Fields spontaneously
    uttered “that white powder in my pocket is a supplement.” 
    Id.
    The “white powder” was Mannitol, a known cutting agent for
    cocaine. 
    Id. at 146
    .
    The backup officers also found $2,000 in cash and a ledger
    on Fields. Inside his car, a K-9 found another $7,001 in cash
    and multiple bottles with concealed “false bottoms containing
    5
    trace amounts of white powder.” 
    Id.
     Fields was subsequently
    arrested.
    Months later, in February 2018, ATF agents applied for a
    search warrant of Fields’s car and the barbershop, which was
    suspected of being a stash house. The 18-page application
    included a paragraph about the November 2017 stop. After a
    court granted the search warrant, ATF agents found additional
    evidence of Fields’s drug trafficking.
    Before trial, Fields challenged the legality of the vehicular
    stop and search warrant. The district court held an evidentiary
    hearing on the stop. Sergeant Chaney (one of the two
    undercover officers) and Officer Haskett (one of the backup
    officers) both testified. The court found their testimony
    credible, concluded that there was probable cause to stop
    Fields, and denied Fields’s suppression motion. The court also
    denied Fields’s motion to suppress evidence from the February
    2018 search.
    As to the November 2017 stop, Fields challenges the
    court’s findings that (1) the officers were credible, and
    (2) there was probable cause for the stop. In addition, he
    disputes the district court’s rejection of his argument regarding
    the 2018 search, and he now adds an argument not raised in the
    district court — that the evidence from the February 2018
    search warrant should be suppressed as poisonous fruit of the
    allegedly unlawful November 2017 stop.
    A
    As for the officers’ credibility, we review the district
    court’s findings for clear error. United States v. Delaney, 
    955 F.3d 1077
    , 1081–82 (D.C. Cir. 2020). And we reverse “when
    a district court credits exceedingly improbable testimony.”
    6
    United States v. Delaney, 
    651 F.3d 15
    , 18 (2001) (cleaned up)
    (emphasis added).
    Fields offers three reasons for reversal.
    First, he argues that because Officer Haskett did not
    immediately stop him or take the necessary steps to cite him
    for speeding, no speeding actually occurred. But that
    conclusion does not follow from those facts. Officer Haskett
    was taking steps to cite Fields for speeding until he discovered
    evidence of a more serious crime — Fields’s drug trafficking.
    It is therefore understandable the stop did not end how it began.
    Second, Fields makes much of Sergeant Chaney’s
    statement that he could not recall “[i]f there were any obvious
    reasons for the stop.” App. 118. What Chaney actually said,
    when asked if he could recall “[i]f there were any obvious
    reasons for stop,” was: “I believe there were, but off the top of
    my head, I couldn’t tell you what it was. 
    Id.
     But in any event,
    Sergeant Chaney was not even the officer who conducted the
    stop. Cause for the stop here depends on what was seen by
    Officer Haskett. And he recalled that Fields was speeding.
    Third, Fields argues that Officer Haskett’s testimony that
    Fields “was going a little fast,” 
    id. at 133
    , is inconsistent with
    his written report that Fields was “traveling at a high rate of
    speed through the parking lot” and that officers approached
    Fields to confront him “about speeding through the parking
    lot,” 
    id. at 145
    .
    That argument, however, distorts Officer Haskett’s
    testimony, which included at least five statements about
    Fields’s driving:
    (1) “I saw a silver Range Rover speeding through the
    parking lot”;
    7
    (2) Fields “was going a little fast for people to — for [him]
    to react to people walking across the road”;
    (3) “I already had probable cause to stop the vehicle
    because of speeding”;
    (4) “I don’t know the exact speed limit, but I do know that
    he was driving faster than he should if people are
    walking with their children and families shopping”; and
    (5) Fields’s “[s]peed [was] greater than reasonable.”
    Hr’g Tr. 9, 11, 31, ECF No. 246 (emphases added).
    Contrary to Fields’s argument, there is no genuine
    inconsistency between the written report and the totality of
    Officer Haskett’s testimony. One can imagine a case where it
    might matter whether a defendant was barely speeding or
    dangerously speeding. But this is not that case. All that matters
    is that Fields committed a traffic violation.
    The district court did not err in finding the officers’
    testimony credible. And we, like the district court, rely on it
    for the next part of our analysis.
    B
    We review the district court’s determination that there was
    a legal basis for the stop de novo. See Delaney, 955 F.3d at
    1081–82.
    Because Officer Haskett observed Fields speeding, he had
    probable cause for the stop. It is well settled that a traffic stop
    “is reasonable where the police have probable cause to believe
    that a traffic violation has occurred.” Whren v. United States,
    
    517 U.S. 806
    , 810 (1996); see also United States v. Sheffield,
    8
    
    832 F.3d 296
    , 302 (D.C. Cir. 2016) (quoting Whren, 
    517 U.S. at 810
    ).2
    We will not consider Fields’s argument that the speeding
    was merely a pretextual justification for the stop because the
    Supreme Court’s precedents “foreclose any argument that the
    constitutional reasonableness of traffic stops depends on the
    actual motivations of the individual officers involved.” Whren,
    
    517 U.S. at 813
    . So too do this court’s precedents. See
    Sheffield, 832 F.3d at 302–03.
    We affirm the district court’s denial of Fields’s motion to
    suppress.
    C
    Because Officer Haskett lawfully stopped Fields, there is
    no poisonous tree from which poisonous fruit could fall.
    Moreover, Fields forfeited his argument that the evidence from
    the February 2018 search warrant should be suppressed as fruit
    of the poisonous tree by not raising that argument in district
    court. “[S]uppression arguments that are not presented to the
    trial court are deemed waived and cannot be argued on appeal.”
    United States v. Castle, 
    825 F.3d 625
    , 632 (D.C. Cir. 2016)
    (cleaned up).
    III
    Fields next argues that the district court erred when it
    denied his request to represent himself at trial. Fields had a
    difficult relationship with his attorneys throughout the
    prosecution. He fired his first attorney in 2018. Three months
    2
    Even without probable cause, an officer’s reasonable suspicion is
    alone enough to justify a traffic stop. See Heien v. North Carolina,
    
    574 U.S. 54
    , 60 (2014).
    9
    before trial, he fired that attorney’s successor. And then, seven
    days into trial, he tried to fire his third attorney. At that point,
    over his co-defendants’ objections, Fields moved to represent
    himself. When the district court asked why, Fields said his
    attorney had not had time to learn the details of the case. He
    also believed his attorney was not “aggressive enough” during
    the trial. App. 361. The district court denied Fields’s request,
    noting they were far along in the trial and Fields’s self-
    representation at that juncture might harm his co-defendants.
    Fields asks us to review the district court’s decision de
    novo. But when a defendant’s request to represent himself is
    made after trial has begun, we review the district court’s
    decision for abuse of the court’s “considerable discretion.”
    United States v. Noah, 
    130 F.3d 490
    , 498 (1st Cir. 1997); see
    also United States v. Washington, 
    353 F.3d 42
    , 46 (D.C. Cir.
    2004) (applying abuse of discretion standard).
    “A person accused of a crime has an absolute right, under
    the Sixth Amendment, to represent himself only if he asserts
    that right before trial.” Washington, 
    353 F.3d at 46
     (emphases
    added). But if asserted after a trial begins, the right of self-
    representation is qualified. It must yield to other interests when
    those interests, such as harm to co-defendants, outweigh it. See
    United States v. Bankoff, 
    613 F.3d 358
    , 373–74 (3d Cir. 2010)
    (“However, after trial has commenced — i.e., at least after the
    jury has been empaneled — the right of self-representation is
    curtailed. In that context, district courts have discretion to deny
    an untimely request to proceed pro se after weighing the
    prejudice to the legitimate interests of the defendant against the
    potential disruption of proceedings already in progress. How
    this balance should be struck is ultimately within the sound
    discretion of the district court, and we will review its decision
    under a highly deferential abuse-of-discretion standard.”)
    (cleaned up); United States v. Walker, 
    142 F.3d 103
    , 108 (2d
    10
    Cir. 1998) (“Once a trial has begun, the defendant’s right to
    self-representation is sharply curtailed. In cases in which the
    request is made following the commencement of the trial, the
    district judge must balance the prejudice to the legitimate
    interests of the defendant against the potential disruption of
    proceedings already in progress. On appeal, considerable
    weight will be given to the district court’s assessment of this
    balance.”) (cleaned up); see also United States v. Dougherty,
    
    473 F.2d 1113
    , 1124 (D.C. Cir. 1972).
    Citing this court’s concern in United States v. Washington
    that a defendant’s request to make his own closing argument
    may be an attempt to tell his story while evading cross-
    examination, see 
    353 F.3d at 46
    , Fields says, “At most,
    Washington stands for the proposition that a defendant may be
    denied self-representation when the request is an effort to game
    the system.” Appellants’ Br. 42. We disagree. Although a
    defendant’s attempt to manipulate the process is a sufficient
    reason to deny a mid-trial request for self-representation, it is
    not a necessary reason. Prejudice to co-defendants is also a
    sufficient reason. So too is disruption of the proceedings.
    Bankoff, 
    613 F.3d at 373
    .
    Here, the district court stated it could not “ignore the
    interests and the rights of the other defendants in this case.”
    App. 367. It thoroughly explained to Fields his request would
    “risk harming” his co-defendants, “whether it’s by a question
    you ask; whether it’s by some objection you make or by an
    objection you don’t make.” 
    Id.
     The court then again noted its
    duty to “not only consider your rights but the rights of these
    four other men” and concluded “the rights of these four other
    men will be jeopardized.” 
    Id.
     Therefore, the court denied
    Fields’s mid-trial request, “given the late juncture and the
    amount of time that has passed in this case and where we find
    ourselves in this case.” 
    Id.
    11
    “A trial involving a pro se defendant and co-defendants
    who are assisted by counsel is pregnant with the possibility of
    prejudice.” United States v. Veteto, 
    701 F.2d 136
    , 139 (11th
    Cir. 1983) (cleaned up). In this case, the reasons to fear that
    possibility — listed above by the district court — were
    compelling. And the district court could have added to those
    reasons Fields’s erratic trial attendance and unwarranted
    hostility to fair proceedings. See, e.g., Appellee’s Supp. App.
    422 (Fields: “I’m being railroaded here, man. I’m being
    railroaded here. I said this from the beginning that we wasn’t
    going to get no justice in this court.”); id. at 424 (Fields refused
    to attend afternoon trial proceedings); App. 372 (Fields: “I’m
    fighting the prosecution and I’m fighting you.” Court: “You’re
    not fighting me.” Fields: “I’m definitely fighting you.”).
    The district court did not abuse its considerable discretion
    when it denied Fields’s request to represent himself.
    IV
    Fields raises two ineffective-assistance-of-counsel claims
    under Strickland v. Washington, 
    466 U.S. 668
     (1984). To
    prevail, he must show (1) “that counsel made errors so serious
    that counsel was not functioning as the ‘counsel’ guaranteed
    the defendant by the Sixth Amendment” and (2) that the error
    prejudiced his defense. Harrington v. Richter, 
    562 U.S. 86
    ,
    104 (2011) (cleaned up). “Even under de novo review, the
    standard for judging counsel’s representation is a most
    deferential one.” 
    Id. at 105
    . We “must apply a strong
    presumption that counsel’s representation was within the wide
    range of reasonable professional assistance.” 
    Id. at 104
    .
    Because Fields’s claims are raised for the first time before
    this Court, we have two options — remand for an evidentiary
    hearing or reject them outright. The latter is permitted when
    defendants present their claims in a vague or conclusory
    12
    manner, when the trial record shows no deficient performance,
    or when that record shows no prejudice. United States v.
    Sitzmann, 
    893 F.3d 811
    , 831–32 (D.C. Cir. 2018) (per curiam);
    United States v. Rashad, 
    331 F.3d 908
    , 909–10 (D.C. Cir.
    2003).
    Here, every paragraph of Fields’s brief — with the
    possible exception of his third of five paragraphs, noted below
    — is conclusory. And even when his arguments are at their
    least conclusory, the trial record shows no deficient
    performance or prejudice.
    A
    His first claim is laid out in four paragraphs. He begins in
    paragraph one by alleging that the relationship with his
    attorneys — recall that he fired the first two, and tried to fire
    the third — was “broken” and that their investigations were not
    “adequate”:
    As we set forth above, Mr. Fields had a broken
    relationship with each of his attorneys. With
    respect to the first two, Mr. McCants and Mr.
    Retureta, one aspect of their ineffectiveness is
    already identified in the record but requires
    further exploration on remand — namely, their
    lack of adequate investigation.
    Appellants’ Br. 48.
    Then in paragraph two, Fields describes his version of the
    evidence against him:
    As the Court is aware from the recitation
    elsewhere in this brief there was limited direct
    evidence against Mr. Fields. No surveillance
    13
    photos showed him engaging in drug
    transactions. The only testimonial evidence
    against him came from a cooperating witness
    who, like all such witnesses, had mixed
    motivation. Thus, the main ground for Mr.
    Fields’ conviction lay in the Government’s
    attempt to tie him to drugs found in a room on
    the second floor above the barbershop. His
    alleged constructive possession of the goods
    found in that room was a critical piece of the
    government’s case in chief.
    
    Id.
    Next, in paragraph three, Fields comes as close as he gets
    to a non-conclusory argument. He alleges other people had
    access to a room above the barbershop where he kept personal
    items and instrumentalities of drug trafficking. And he faults
    his initial attorneys for not finding them. But he never says
    how many people had access, who they were, or why we should
    believe that these unidentified people actually exist — aside
    from Fields’s entirely self-serving “insiste[nce]” that they do:
    And thus, negating that inference of
    constructive possession was a vital component
    of Mr. Fields’ defense. Throughout the time
    prior to trial, Mr. Fields insisted that other
    individuals also had keys to the room above the
    barbershop — a fact which, if established,
    would have afforded him the opportunity to
    argue the insufficiency of the government’s
    evidence attempting to attribute those drugs to
    him. Yet, Mr. Fields’ initial attorney, Mr.
    McCants, does not appear to have conducted the
    investigation necessary to evaluate Fields’s
    14
    requests. And Mr. Fields maintains that there is
    no evidence that Mr. Retureta pursued that
    investigation, either.
    
    Id.
     at 48–49 (cleaned up).
    Even assuming this, Fields’s least conclusory paragraph,
    is sufficiently non-conclusory — which is doubtful — it was
    neither deficient performance nor prejudicial for his counsel
    not to investigate “other individuals” with “keys to the room
    above the barbershop” where Fields kept cash, drugs, drug
    paraphernalia, and personal items. Connecting others to the
    room would not have eliminated the evidence connecting
    Fields to the room. So even if his attorney had investigated the
    unnamed “other individuals,” and even if they too were drug
    dealers, the jury would have learned nothing more than the
    unremarkable fact that Fields, a drug dealer, hung out and
    shared space with other drug dealers. Cf. Trial Tr. 69, ECF No.
    312 (“[D]espite the fact that you heard Mr. Fields in person and
    on the phone again and again and again talk about how
    everybody has got keys, everybody has access . . . , [m]ultiple
    people can jointly have property in their constructive
    possession. That’s the concept of both constructive possession
    and a conspiracy. It’s teamwork.”).
    Finally, in paragraph four, Fields ends his first claim where
    he began — by repeating his conclusory claim that his
    attorneys should have “conduct[ed] an investigation”:
    As the Supreme Court recently put it:
    “Counsel . . . has a duty to make reasonable
    investigations or to make a reasonable decision
    that     makes      particular     investigations
    unnecessary. . . . In any ineffectiveness case, a
    particular decision not to investigate must be
    directly assessed for reasonableness in all the
    15
    circumstances, applying a heavy measure of
    deference to counsel’s judgments.” Here, no
    assessment has been made as to the judgment of
    counsel     in   failing  to     conduct   an
    investigation — manifestly necessitating an
    evidentiary inquiry.
    
    Id. at 49
     (cleaned up).
    B
    Fields’s other (conclusory) claim is laid out in one
    paragraph — paragraph five. There he alleges his attorney did
    not adequately cross-examine Clark, the government’s witness
    who identified him as the leader of the conspiracy. But Fields
    identifies no question his attorney should have asked that
    would have impeached Clark or exculpated Fields. Instead,
    Fields faults his attorney for not mentioning the absence of call
    records reflecting Clark’s conversations with Fields. The
    absence of evidence, however, is not evidence of absence. So
    the absence of call records would not, in Fields’s words, have
    “exploit[ed] inconsistencies” in Clarks’s testimony. 
    Id.
     And
    Fields fails to specify any other purported inconsistencies:
    In addition, at an evidentiary hearing Mr. Fields
    would also establish the reasons for his
    dissatisfaction with the representation provided
    by Ms. West, whose cross-examination of the
    cooperating witness, Byran Clark, was in Mr.
    Fields’ view inadequate. She failed to exploit
    inconsistencies between the proffers that Mr.
    Clark earlier had made to the government and
    his sworn testimony. By way of example,
    although Clark contended that he was in
    frequent contact with Mr. Fields there were no
    16
    call records — none — reflecting conversations
    between them.
    
    Id.
    In short, Fields does little more than state his
    “dissatisfaction” with his attorneys based on an investigation
    and cross-examination he deems inadequate for the vaguest of
    reasons and then conclude that this alone entitles him to relief.
    But we reject conclusory claims that leave out specific reasons
    for counsel’s deficient performance and prejudice under
    Strickland. It is not nearly enough for Fields to simply state his
    dissatisfaction and then conclude that his dissatisfaction
    satisfied Strickland. We will therefore not remand Fields’s
    ineffective-assistance-of-counsel claims for an evidentiary
    hearing and instead reject those claims.3
    V
    We now turn to Samuels’s claims. He first contends that
    his trial counsel, Joseph Conte, provided ineffective assistance.
    Samuels primarily argues that Conte was ineffective under
    Cuyler v. Sullivan, 
    446 U.S. 335
     (1980), which requires the
    defendant to show “(1) that his lawyer acted under an actual
    conflict of interest” and (2) that the conflict caused “an actual
    lapse in representation.” United States v. McGill, 
    815 F.3d 846
    , 943 (D.C. Cir. 2016) (cleaned up); see Cuyler, 
    446 U.S. at 349
    .       Because Cuyler relaxes Strickland’s prejudice
    3
    We also hold a non-conclusory argument would have fared no
    better. With regard to Clark’s testimony, the performance of Fields’s
    trial attorney was not deficient or prejudicial. She repeatedly elicited
    purported inconsistencies between his pre-trial statements and trial
    testimony, as did three attorneys for Fields’s co-defendants. Fields’s
    attorney even made the point about the absence of text messages in
    her closing argument.
    17
    requirement, we are “reluctant to allow defendants to force
    their ineffective assistance claims into the ‘actual conflict of
    interest’ framework and thereby supplant the strict Strickland
    standard.” United States v. Taylor, 
    139 F.3d 924
    , 930 (D.C.
    Cir. 1998) (cleaned up). We thus closely scrutinize claims
    under Cuyler.
    Samuels argues that Conte was conflicted because his
    daughter worked for the U.S. Attorney’s Office for the District
    of Columbia, which prosecuted Samuels. Although Conte
    mentioned his daughter’s job to the prosecutor, he informed
    neither Samuels nor the district court. Shortly before
    Samuels’s sentencing, the district court learned about the issue,
    appointed new counsel, and ordered briefing. The court
    concluded that Conte’s failure to disclose his daughter’s job
    raised a potential conflict of interest, and it set an evidentiary
    hearing on that issue. Later, the court granted the parties’ joint
    motion to vacate the hearing without resolving the conflict
    issue. Now on appeal, Samuels again contends that Conte had
    a conflict of interest.
    As discussed, we ordinarily remand “colorable and
    previously unexplored claims of ineffective assistance” for
    evidentiary hearings. United States v. Marshall, 
    946 F.3d 591
    ,
    596 (D.C. Cir. 2020) (cleaned up); see McGill, 815 F.3d at 942.
    But remand is unwarranted where the record establishes that
    counsel was not ineffective, where the appellant’s allegations
    are vague and conclusory, or where the appellant fails to
    identify an issue that “requires a determination of facts.”
    Sitzmann, 893 F.3d at 832 (cleaned up). Moreover, our
    standard for remand is blunted by “the strong presumption that
    counsel made all significant decisions in the exercise of
    reasonable professional judgment,” which extends to claims
    under Cuyler. Taylor, 139 F.3d at 934 (cleaned up); see also
    Burger v. Kemp, 
    483 U.S. 776
    , 784 (1987) (“[W]e generally
    18
    presume that the lawyer is fully conscious of the overarching
    duty of complete loyalty to his or her client.”).4
    We assume that Conte was conflicted and resolve this
    appeal under Cuyler’s second prong, which considers whether
    the conflict led to an “actual lapse in representation.” McGill,
    815 F.3d at 943 (cleaned up). To satisfy this standard, Samuels
    must articulate a strategy that a reasonable, nonconflicted
    defense counsel would have pursued. See United States v.
    Gantt, 
    140 F.3d 249
    , 254 (D.C. Cir. 1998). The conflict must
    have caused the failure to pursue this strategy, United States v.
    Bruce, 
    89 F.3d 886
    , 896 (D.C. Cir. 1996), and must have
    “significantly affected counsel’s performance . . . rendering the
    4
    We are skeptical that Samuels preserved his ineffective-assistance
    claim. “The law in this circuit is that a claim of ineffective assistance
    must be made in a motion for a new trial ‘when counsel changes prior
    to appeal and when there is still a reasonable opportunity to challenge
    a conviction in the District Court.’” United States v. Wood, 
    879 F.2d 927
    , 933 (D.C. Cir. 1989) (quoting United States v. Debango, 
    780 F.2d 81
    , 86 (D.C. Cir. 1986)). Before he appealed, Samuels received
    new counsel and pressed a claim that his former counsel was
    ineffective because of a conflict of interest. Moreover, after the
    district court set an evidentiary hearing to explore the conflict issue,
    Samuels — acting through his new counsel — affirmatively moved
    to proceed without a hearing. Nevertheless, the government waived
    any forfeiture (or waiver) argument by stipulating that it would not
    raise that issue in the joint motion to vacate the evidentiary hearing.
    See United States v. Layeni, 
    90 F.3d 514
    , 522 (D.C. Cir. 1996). The
    government’s stipulation is not binding on us, see Weston v.
    WMATA, 
    78 F.3d 682
    , 685 (D.C. Cir. 1996), and we have significant
    concern with remanding now for a hearing that Samuels
    affirmatively eschewed. But because we may reject Samuels’s
    Cuyler claim on the present record, we accept the stipulation and
    proceed to the merits.
    19
    verdict unreliable, even though Strickland prejudice cannot be
    shown,” Mickens v. Taylor, 
    535 U.S. 162
    , 173 (2002).
    Under this standard, Conte’s failure to tell anyone other
    than the prosecutor about his daughter’s job is not itself enough
    to establish ineffective assistance. Cuyler “requires proof of
    effect upon representation.” 
    Id.
     Without more, the “inadequate
    disclosure” of a conflict is “not an adverse effect on counsel’s
    performance.” United States v. Mett, 
    65 F.3d 1531
    , 1536 (9th
    Cir. 1995); see Blake v. United States, 
    723 F.3d 870
    , 878, 881–
    82 (7th Cir. 2013). And Samuels does not explain how Conte’s
    limited disclosure so significantly affected his performance as
    to make the verdict unreliable.
    To show an adverse effect, Samuels identifies three points
    that he claims Conte failed to raise. According to Samuels,
    Conte (1) missed an argument supporting a motion to suppress
    his statement about the shotgun found under his bed, (2) failed
    to timely oppose expert testimony on drug distribution, and (3)
    did not cite evidence to support a multiple-conspiracy
    instruction. Samuels posits that Conte avoided these points to
    advance his daughter’s interests as an employee in the U.S.
    Attorney’s office — i.e., he “pulled punches that a reasonable,
    conflict-free counsel would have thrown.” Appellants’ Br. 51.
    Samuels concludes that these failures make his verdict
    unreliable. We disagree.
    To begin, Samuels failed to identify any plausible link
    between the alleged conflict and the points that Conte
    purportedly missed. See Bruce, 
    89 F.3d at 896
    . His theory of
    causation — that Conte “pulled punches” to help his daughter
    — is belied by the trial record, which shows that the punches
    Conte threw were no less forceful than the ones he ostensibly
    pulled. For example, as explained below, Conte sought to
    sever Samuels’s trial from Fields’s, which would have
    20
    considerably increased the government’s workload, see
    Richardson v. Marsh, 
    481 U.S. 200
    , 210 (1987). He also
    forcefully challenged the credibility of the government’s
    central witness and offered alternative explanations for why
    Samuels appeared on Fields’s ledger (to pay for car insurance)
    and for why Samuels identified the shotgun (to cover for his
    girlfriend). With no distinction between these arguments and
    the ones that Conte ostensibly missed, Samuels’s theory of
    causation is not plausible.
    Separate from causation, none of the purportedly missed
    arguments identifies a plausible lapse in representation. The
    first concerns Conte’s unsuccessful motion to suppress
    Samuels’s admission that he owned the shotgun agents found
    in his house. Conte had argued that the admission was
    involuntary because Samuels was suffering from heroin
    withdrawal at the time. The district court disagreed. On
    appeal, Samuels faults Conte for not also arguing that the
    statement was involuntary because he was under the influence
    of cocaine.
    Conte’s failure to make this argument was not a colorable
    lapse in representation. The “mere fact that one has taken
    drugs, or is intoxicated, or mentally agitated, does not render
    consent involuntary.” United States v. Castellanos, 
    518 F.3d 965
    , 969 (8th Cir. 2008) (cleaned up). Instead, “coercive police
    activity” is necessary to find a confession involuntary.
    Colorado v. Connelly, 
    479 U.S. 157
    , 167 (1986). And the
    district court, in rejecting the heroin-withdrawal argument,
    found that the audio recording of Samuels’s confession showed
    “no coercive police activity.” App. 89. It would thus have
    been futile to argue that Samuels’s consent was involuntary due
    to cocaine use. And the failure to raise a meritless objection is
    not colorably deficient. See Sitzmann, 893 F.3d at 833.
    21
    Second, Samuels argues that Conte failed to investigate or
    timely challenge testimony from a government expert that the
    amount of cocaine seized from Samuels’s home —
    approximately 3.5 grams — was consistent with distribution
    rather than personal use. Conte moved to exclude the
    testimony on the day of the expert’s testimony, but the district
    court denied the motion as untimely.
    Samuels again identifies no colorable deficiency. For one
    thing, he does not explain why the motion to exclude the expert
    testimony might have been successful if timely, so this
    argument is too vague and conclusory to support remand. See
    id. at 832–33. He instead contends that Conte failed to develop
    evidence to counter the government’s expert. But Conte forced
    the expert to concede that the amount of cocaine in Samuels’s
    possession could have been for personal use. And he relied
    heavily on the possibility of personal use in his closing
    arguments, contending, for example, that Samuels owned a
    scale because he bought in bulk and did not want to be cheated.
    In other words, Samuels faults Conte for not offering
    cumulative evidence to support personal use, which is not
    enough for remand. See id. at 833.
    Finally, Samuels contends that Conte botched his request
    for a multiple-conspiracy instruction, which would have
    clarified that the jury needed to find that Samuels was a
    member of the same conspiracy charged in the indictment to
    support a guilty verdict. In denying Conte’s request, the district
    court reasoned that there was no evidence of Samuels
    “interacting with anyone else . . . who’s not identified as a
    conspirator in this case.” App. 609. Samuels contends that
    there was such evidence, which Conte missed, namely Clark’s
    testimony that Samuels obtained crack cocaine to distribute in
    Virginia from “a guy named Miguel Harris.” Id. at 391. The
    22
    indictment mentioned neither Harris nor a conspiracy to
    distribute crack cocaine.
    It is at least plausible that Samuels would have received
    the multiple-conspiracy instruction had Conte flagged this
    evidence. If requested, a district court must give the instruction
    where the “record evidence supports the existence of multiple
    conspiracies.” United States v. Sanders, 
    778 F.3d 1042
    , 1047
    (D.C. Cir. 2015) (cleaned up). And Clark testified that Samuels
    “started purchasing” crack from Harris for distribution.
    App. 391. This testimony could perhaps support the inference
    that Harris was a “regular source,” which would be enough to
    create a separate conspiracy. United States v. Morris, 
    836 F.2d 1371
    , 1374 (D.C. Cir. 1988).
    But Conte’s failure to secure the instruction is not enough
    to show that a conflict “significantly affected” his performance
    and made the verdict “unreliable.” Mickens, 
    535 U.S. at 173
    .
    Whatever the contours of this standard, the failure to recall a
    single line of testimony in a three-week trial that might support
    a peripheral jury instruction cannot fairly be described as
    significant. Moreover, it casts no doubt on the verdict, which
    found that Samuels was guilty of conspiring to distribute heroin
    and fentanyl, not crack cocaine. Samuel’s case thus falls well
    outside Cuyler, which “is designed to protect a defendant when
    it is impossible to reconstruct what might have occurred
    without counsel’s conflict of interest.” Plunk v. Hobbs, 
    766 F.3d 760
    , 766 (8th Cir. 2014).
    Samuels alternatively contends that Conte was ineffective
    under Strickland, which requires him to show that his counsel’s
    performance was deficient and prejudicial, see 
    466 U.S. at 687
    .
    For the reasons given above, Samuels has not proven deficient
    performance. And because he does not satisfy Cuyler’s lower
    standard to prove a “significant[]” effect on representation, he
    23
    also fails to satisfy Strickland’s more demanding requirement
    of prejudice. Mickens, 
    535 U.S. at 173
    .
    In sum, Samuels has established no colorable claim of
    ineffective assistance under Cuyler or Strickland. His Cuyler
    claim fails because he has not plausibly proven that Conte’s
    alleged conflict of interest caused an adverse effect that rises to
    the level of an actual lapse in representation. And his
    Strickland claim fails for lack of any colorable case for
    deficient performance or prejudice.
    VI
    Samuels next argues that the district court impermissibly
    limited his ability to cross-examine Clark, the government’s
    central witness, about his prior bad acts. When Clark testified,
    he had previously pleaded guilty to kidnapping and obstruction
    of justice as part of a plea agreement that depended on his
    cooperation against Samuels in this case. Samuels claims that
    Clark earned the kidnapping charge by taking a person hostage
    at gunpoint, robbing him, and pointing a gun at the victim’s
    head. For obstruction of justice, Samuels contends that Clark
    directed a third party to threaten a witness to not testify. Clark
    also had other prior convictions, including one for murder.
    Samuels sought to cross-examine Clark about his convictions
    and the facts underlying them to impeach Clark’s credibility
    and to establish that the plea agreement gave Clark a bias.
    The district court adopted a halfway approach, explaining
    that it had to balance the probative value of Clark’s prior bad
    acts against the risk that the facts would “just dirty [him] up
    because he’s a bad dude.” App. 428. The court allowed
    Samuels to cross-examine Clark about the existence of his prior
    convictions; about the facts underlying charges the government
    reduced, dropped, or never brought due to Clark’s cooperation;
    and about other possible sources of bias. But it excluded
    24
    questions about the facts underlying his convictions, reasoning
    that they would be “more prejudicial than probative.”
    Appellee’s Supp. App. 490. It also agreed with the government
    that those questions risked a “circus within a circus, a trial
    within a trial” about Clark. App. 433–34. Finally, it refused to
    let Samuels question Clark about the alleged witness
    intimidation after concluding that Samuels had no factual basis
    in the record to assume a threat occurred.
    Samuels contends that the district court’s ruling violated
    both the Confrontation Clause and Federal Rule of Evidence
    403. Under the Confrontation Clause, a trial court “may limit
    cross-examination only after there has been permitted, as a
    matter of right, a certain threshold level of cross-examination.”
    United States v. Hall, 
    945 F.3d 507
    , 513 (D.C. Cir. 2019)
    (cleaned up). That threshold is satisfied “so long as defense
    counsel is able to elicit enough information to allow a
    discriminating appraisal of a witness’s motives and bias.” 
    Id.
    (cleaned up). Otherwise, district courts “retain wide latitude”
    to “impose reasonable limits on . . . cross-examination” under
    the Federal Rules of Evidence. Delaware v. Van Arsdall, 
    475 U.S. 673
    , 679 (1986). Relevant here, Rule 403 allows courts
    to exclude evidence “if its probative value is substantially
    outweighed by a danger of . . . unfair prejudice” or “confusing
    the issues.” We review limits on cross-examination for an
    abuse of discretion. United States v. Lin, 
    101 F.3d 760
    , 768
    (D.C. Cir. 1996); Henderson v. Geo. Wash. Univ., 
    449 F.3d 127
    , 133 (D.C. Cir. 2006).
    The district court did not violate the Confrontation Clause.
    Such a violation occurs “only when the court bars a legitimate
    line of inquiry that might have given the jury a significantly
    different impression of the witness’s credibility.” United
    States v. Miller, 
    738 F.3d 361
    , 375 (D.C. Cir. 2013) (cleaned
    up). Samuels elicited ample testimony to give the jury the
    25
    impression that Clark was lawless and had a substantial reason
    to testify in favor of the government. Among other impeaching
    facts, the jury learned about Clark’s cooperation agreement; his
    prior convictions; and that he robbed and kidnapped a man,
    stole a car, and used a firearm during various crimes. This
    cross-examination easily clears the threshold required by the
    Confrontation Clause. See, e.g., Hall, 945 F.3d at 513 (no
    violation where defendant cross-examined government witness
    on guilty plea in cooperation deal).
    Nor did the district court abuse its discretion under Rule
    403. Without acknowledging the court’s concerns about unfair
    prejudice, Samuels argues that the salacious facts underlying
    Clark’s prior convictions are “information the jury should have
    heard to evaluate whether someone with that little regard for
    human life and the law would have any compunction about
    lying under oath to reduce his time in prison.” Appellants’ Br.
    75. But while “evidence of lawlessness can undermine the
    perpetrator’s probable truthfulness . . . admission of such
    evidence is subject to the sound discretion of the trial court.”
    United States v. Garcia Sota, 
    948 F.3d 356
    , 363 (D.C. Cir.
    2020); see also FED. R. EVID. 609(a)(1)(A). And the court here
    acted well within its discretion in concluding that the risk of
    unfair prejudice stemming from the facts it excluded
    substantially outweighed any cumulative probative value. This
    Court has long acknowledged the risk that evidence of prior
    criminal activity would impermissibly lead juries to discredit
    witnesses because they are “bad men,” rather than because they
    are biased or not credible. United States v. Fox, 
    473 F.2d 131
    ,
    135 (D.C. Cir. 1972). Thus, “when evidence of a prior
    conviction is admitted for purposes of impeachment, cross-
    examination is usually limited to the essential facts rather than
    the surrounding details of the conviction.” United States v.
    Baylor, 
    97 F.3d 542
    , 544 (D.C. Cir. 1996). Not only did the
    district court allow cross-examination on the essential facts of
    26
    Clark’s convictions, it let the jury hear about a wide range of
    Clark’s other criminal activity. We find no error in the district
    court’s limited restrictions on Clark’s cross-examination.
    Samuels also contends that the details underlying the
    obstruction charge are particularly probative because they
    involved a threat to intimidate a witness. But the district court
    did not limit questions about witness intimidation based on
    Rule 403. As noted, it restricted those questions because
    Samuels lacked a factual basis to ask them. See Lin, 101 F.3d
    at 768 (“counsel must have a reasonable basis for asking
    questions on cross-examination which tend to incriminate or
    degrade the witness”) (cleaned up). In his reply brief, Samuels
    objects that the district court erroneously discounted evidence
    that provided a factual basis for the questions. This objection
    is forfeited, see M.M.V. v. Garland, 
    1 F.4th 1100
    , 1111 (D.C.
    Cir. 2021), and also meritless. Samuels points to no record
    evidence suggesting that Clark threatened a witness. Instead,
    he gestures at unspecified grand-jury testimony that he admits
    is not in the record, which is not good enough. See United
    States v. Boyd, 
    54 F.3d 868
    , 871–72 (D.C. Cir. 1995) (basis for
    cross-examination must be in the record). Samuels also faults
    the government for not providing further evidence to support
    its representation that Clark’s obstruction charge did not
    involve threats. But an objection to limits on cross-
    examination is not the appropriate vehicle to challenge the
    government’s compliance with discovery obligations. Samuels
    held the burden of proffering a sufficient factual basis to
    question Clark about threats. See Lin, 101 F.3d at 768. And
    the district court did not abuse its discretion when it ruled that
    he failed to satisfy that burden.
    Moreover, any error by the district court would have been
    “rendered fully harmless by the broad range of other heinous
    conduct that the court allowed defense counsel to bring out in
    27
    cross-examination.” Garcia Sota, 948 F.3d at 363; see Van
    Arsdall, 
    475 U.S. at 684
    ; United States v. Whitmore, 
    359 F.3d 609
    , 622 (D.C. Cir. 2004). As explained, Samuels extracted
    testimony from Clark about his convictions and the facts
    underlying several violent crimes for which the government
    declined to prosecute him. Samuels’s inability to elicit similar
    impeaching evidence was harmless because the cross-
    examination “was enough to enable the jury to assess the
    relation between [Clark’s] lawlessness and his propensity for
    truthfulness.” Garcia Sota, 948 F.3d at 363.
    In sum, the district court acted well within its discretion
    under the Confrontation Clause and Rule 403 in limiting
    Clark’s cross-examination, and any improper limits would
    have amounted to harmless error.
    VII
    We next consider the arguments made by Samuels and
    Tucker that the district court abused its discretion in denying
    their motions to sever their trials from Fields’s trial. Samuels
    and Tucker argue that severance was warranted due to
    “spillover” prejudice resulting from the disparity in evidence
    between them and Fields as well as Fields’s obstreperous
    behavior during trial. Fields, the undisputed ringleader of the
    drug distribution conspiracy, frequently displayed less than
    exemplary behavior in court. At one point, he absented himself
    from the trial for part of a day. Towards the end of trial, Fields
    testified on his behalf. He was the only defendant to do so, and
    the testimony did not go well. Fields gave conflicting and
    unbelievable explanations for the evidence against him,
    accused the government of planting evidence, speculated about
    the government’s motives for prosecuting him and his co-
    defendants, and became combative with the prosecutor and the
    district court. Both before and after Fields’s testimony,
    28
    Samuels and Tucker moved to sever their trials on the ground
    that Fields’s lies and misbehavior would be held against them
    by the jury. The district court denied this motion, explaining
    that Fields’s credibility was a matter for the jury to decide and
    that Fields did not say anything “about the other defendants that
    already didn’t come in the government’s case-in-chief.” App.
    725.
    “We review the denial of a motion to sever for abuse of
    discretion.” United States v. Wilson, 
    605 F.3d 985
    , 1015 (D.C.
    Cir. 2010). The Federal Rules of Criminal Procedure permit
    joinder of defendants “alleged to have participated in the same
    act or transaction, or in the same series of acts or transactions,
    constituting an offense or offenses.” FED. R. CRIM. P. 8(b).
    Joint trials are preferred in federal criminal cases because they
    “promote efficiency and serve the interests of justice by
    avoiding the scandal and inequity of inconsistent verdicts.”
    Zafiro v. United States, 
    506 U.S. 534
    , 537 (1993) (cleaned up).
    The preference for joint trials is “‘especially strong’ when ‘the
    respective charges require presentation of much the same
    evidence, testimony of the same witnesses, and
    involve . . . defendants who are charged, inter alia, with
    participating in the same illegal acts.’” Wilson, 
    605 F.3d at 1016
     (cleaned up). We find that neither the disparity in
    evidence between co-defendants, nor Fields’s behavior during
    trial, warranted severance because any risk of prejudice was
    curable with appropriate instructions.
    A joined defendant may seek to sever his trial from that of
    his         co-defendants.             “If      the       joinder
    of . . . defendants . . . appears to prejudice a defendant . . . ,
    the court may . . . sever the defendants’ trials, or provide any
    other relief that justice requires.” FED. R. CRIM. P. 14(a)
    (emphasis added). The permissive language of this rule makes
    clear that severance is not required “even if prejudice is
    29
    shown.” Zafiro, 
    506 U.S. at
    538–39. Instead, Rule 14 grants a
    district court “significant flexibility to determine how to
    remedy any potential risk of prejudice posed by the joinder of
    multiple defendants in a single trial.” United States v. Moore,
    
    651 F.3d 30
    , 95 (D.C. Cir. 2011) (per curiam). Severance is
    the exception rather than the rule and is required only when
    there is “a serious risk that a joint trial would compromise a
    specific trial right of one of the defendants, or prevent the jury
    from making a reliable judgment about guilt or innocence.”
    Zafiro, 
    506 U.S. at 539
    . Although a serious risk may arise
    when “defendants are tried together in a complex case and they
    have markedly different degrees of culpability,” even in cases
    where the risk of prejudice is high, “less drastic measures, such
    as limiting instructions, often will suffice to cure any risk of
    prejudice.” 
    Id.
     In light of these principles, motions to sever
    should be granted “sparingly.” United States v. Celis, 
    608 F.3d 818
    , 844 (D.C. Cir. 2010).
    Appellants “carr[y] the burden of demonstrating prejudice
    resulting from a failure to sever.” United States v. Gooch, 
    665 F.3d 1318
    , 1336 (D.C. Cir. 2012). Samuels and Tucker here
    assert spillover prejudice, namely the risk “the jury would use
    evidence of one defendant’s guilt against another.” United
    States v. Spriggs, 
    102 F.3d 1245
    , 1256 (D.C. Cir. 1996). They
    maintain this prejudice arose from trying them, peripheral
    players in the conspiracy, together with Fields, “a perjurious
    and obstructionist lead defendant.” Appellants’ Br. 97.
    Samuels and Tucker fail to demonstrate prejudice.
    First, Samuels and Tucker have not demonstrated
    prejudice from evidentiary spillover. Disparity in evidence
    requires severance “when the evidence against one defendant
    is ‘far more damaging’ than the evidence against the moving
    party,” but will not require severance in a conspiracy trial when
    there is “substantial and independent evidence of each
    30
    defendant’s significant involvement in the conspiracy.”
    Moore, 
    651 F.3d at
    95–96 (cleaned up). “[A]bsent a dramatic
    disparity of evidence, any prejudice caused by joinder is best
    dealt with by instructions to the jury to give individual
    consideration to each defendant.” 
    Id. at 95
     (cleaned up). The
    varying roles played by members of a conspiracy will “not
    render joint trial inappropriate as long as the jury can
    reasonably compartmentalize the substantial and independent
    evidence against each defendant.” United States v. Straker,
    
    800 F.3d 570
    , 628 (D.C. Cir. 2015) (per curiam). As we will
    explain in Part VIII, the government introduced substantial and
    independent evidence of Samuels’s and Tucker’s involvement
    in the conspiracy. Although Samuels and Tucker played a
    subordinate role in the conspiracy led by Fields, we hold “the
    disparity of evidence did not rise to a level necessary to
    mandate severance.” Moore, 
    651 F.3d at 96
    .
    Second, Samuels and Tucker have not established
    prejudice from Fields’s misbehavior during trial. Courtroom
    misconduct by a co-defendant must be especially egregious to
    mandate severance. See, e.g., United States v. Rocha, 
    916 F.2d 219
    , 229 (5th Cir. 1990) (no severance required when co-
    defendant “mouthed the words, ‘You are dead,’ and moved a
    finger across his throat” during a witness’s direct examination);
    United States v. Marshall, 
    458 F.2d 446
    , 448, 452 (2d Cir.
    1972) (no severance required when a co-defendant directed
    obscenities at the court and witnesses, absented himself, threw
    a chair towards the jury box, and cut his wrists during
    summation). “Cautionary instructions . . . should remain the
    primary weapons against improper jury bias.” United States v.
    Mannie, 
    509 F.3d 851
    , 857 (7th Cir. 2007). Fields’s behavior
    was mildly disruptive: he was combative on the stand, refused
    to attend part of the trial, and made demonstrably false
    statements during his testimony. This misbehavior is simply
    not so beyond the pale as to mandate severance.
    31
    At bottom, this is not a case in which curative instructions
    were ineffective against potential prejudice. The district court
    gave several careful and tailored instructions throughout the
    trial. When Fields failed to show up one day, the district court
    instructed the jury that his “absence should not . . . be viewed
    as evidence or held against any other defendant in this matter
    in any way whatsoever.” App. 347. The district court also
    instructed the jury that “each defendant is entitled to have the
    issue of his guilt as to each of the crimes for which he’s on trial
    determined from his own conduct and from the evidence that
    applies to him as if he were being tried alone.” Appellee’s
    Supp. App. 784–85. The instructions explicitly stated that the
    jury’s verdict as to one defendant should not “influence [its]
    verdict with respect to any other defendant as to that count or
    any other count in the Indictment.” Id. at 785. The
    effectiveness of the district court’s instructions is indicated by
    the jury returning mixed verdicts as to each of the defendants,
    including Fields. See United States v. Gilliam, 
    167 F.3d 628
    ,
    636 (D.C. Cir. 1999) (explaining that mixed “verdicts indicate
    that the jury was able to distinguish between the defendants”).
    We presume that juries follow the court’s instructions when, as
    here, there is no evidence to the contrary. 
    Id.
    The district court cured any potential prejudice to Samuels
    and Tucker with limiting instructions and did not abuse its
    discretion in denying their motions to sever.
    VIII
    We turn next to Samuels’s and Tucker’s challenge to the
    sufficiency of the evidence to sustain their convictions for
    conspiracy to distribute heroin under 
    21 U.S.C. § 846
    .
    To overturn a jury verdict for insufficient evidence, “a
    defendant faces a high threshold.” United States v. Washington,
    
    12 F.3d 1128
    , 1135 (D.C. Cir. 1994). In reviewing for
    32
    sufficiency of the evidence, we consider “‘whether, after
    viewing the evidence in the light most favorable to the
    prosecution, any rational trier of fact could have found the
    essential elements of the crime beyond a reasonable doubt.’”
    United States v. Gaskins, 
    690 F.3d 569
    , 576–77 (D.C. Cir.
    2012) (quoting Jackson v. Virginia, 
    443 U.S. 307
    , 319 (1979)).
    In applying this standard, we “draw[] no distinction between
    direct and circumstantial evidence, and ‘giv[e] full play to the
    right of the jury to determine credibility, weigh the evidence
    and draw justifiable inferences of fact.’” United States v.
    Williams, 
    836 F.3d 1
    , 6 (D.C. Cir. 2016) (quoting United States
    v. Battle, 
    613 F.3d 258
    , 264 (D.C. Cir. 2010)).
    To convict Samuels and Tucker of conspiracy to distribute
    heroin, the government had to prove they acted knowingly and
    with the “specific intent to further the conspiracy’s objective.”
    United States v. Childress, 
    58 F.3d 693
    , 708 (D.C. Cir. 1995).
    The evidence here easily passes muster under our deferential
    standard of review.
    With respect to Samuels, sufficient evidence supports that
    he knowingly furthered the conspiracy to distribute heroin.
    Fields controlled operations in the drug distribution conspiracy
    from the suite above the barbershop, where agents found
    approximately $60,000 worth of heroin as well as other drug
    paraphernalia. The evidence established that Samuels assisted
    Fields in this endeavor. Clark, the cooperating witness who
    testified that he frequently went to the barbershop to obtain
    heroin from Fields, placed Samuels regularly with Fields while
    Fields packaged drugs for distribution. GPS data from
    Samuels’s cellphone also put him in the vicinity of the
    barbershop hundreds of times during the life of the conspiracy.
    As Clark testified, Samuels assisted Fields by opening the door
    and controlling access to the upstairs suite where the drugs
    were, which was corroborated by text messages to Samuels that
    33
    included “let me in” and “open the door.” Appellee’s Supp.
    App. 191–92. Text messages also demonstrated that Samuels
    was in frequent contact with other members of the conspiracy
    and used coded references to drug transactions. Moreover,
    Clark testified that Samuels had delivered five grams of heroin
    on one occasion when Clark was in a car with two other
    members of the conspiracy. Viewed in the light most favorable
    to the government, this evidence, combined with Samuels’s
    frequent presence in the barbershop while Fields, the leader of
    the conspiracy, engaged in drug transactions, is sufficient to
    sustain Samuels’s conviction for conspiracy to distribute
    heroin. See, e.g., Childress, 
    58 F.3d at 712
     (finding the
    evidence sufficient when defendants personally handled drugs,
    prepared them for sale, and did so at the direction of the
    conspiracy’s leader).
    Sufficient evidence also supported Tucker’s conviction
    and established his role as a street-level dealer in the
    conspiracy. Clark’s testimony put Tucker at the barbershop
    frequently, “[a]cting like [Tucker had] a license to sell
    drugs . . . [h]aving . . . no discretion, . . . no trying to hide it or
    anything, just out in the open.” Appellee’s Supp. App. 457.
    Tucker’s frequent presence at the barbershop was corroborated
    by GPS data and law enforcement surveillance. Notably,
    agents observed Tucker engaged in “what appeared to be a
    hand-to-hand narcotics transaction” on the street in front of the
    barbershop. Id. at 363. Clark testified that he saw Tucker
    coming from the upstairs suite of the barbershop adjusting his
    “lower crotch area,” and explained that when he used to sell
    drugs, he hid his stash in his “crotch area” to avoid detection
    by the police. Id. at 458. Clark also explained that heroin could
    be pink or tan depending on the substance it was cut with and
    that dealers often used slang to talk about narcotics. Tucker’s
    text messages mentioned selling pink shirts and tan shoes,
    statements the jury could reasonably infer were references to
    34
    narcotics. Given Tucker’s close relationship with Fields and
    frequent presence at the barbershop, the jury also could
    reasonably infer that Tucker obtained the heroin he sold from
    Fields. Viewing the evidence in the light most favorable to the
    government, sufficient evidence supported Tucker’s
    conviction for conspiracy to distribute heroin.
    Samuels and Tucker also seek to rely on Gaskins, in which
    this court found the evidence insufficient to sustain a drug-
    trafficking conspiracy conviction. In that case, despite
    extensive police surveillance and searches, no evidence put
    Gaskins in the presence of drugs, nor did any witness connect
    him to the conspiracy. See 690 F.3d at 572. Tucker argues that
    the evidence against him is similarly flimsy because he did not
    directly text members of the conspiracy, and Clark’s testimony
    and the street-level buys at most established his role as an
    independent street-level dealer. Samuels also points to the lack
    of controlled buys, wiretaps, or surveillance as reasons why the
    evidence against him was insufficient. These arguments
    founder on the fact that the evidence against both Samuels and
    Tucker was far more robust than the evidence in Gaskins.
    Unlike Gaskins, both Samuels and Tucker “discussed drugs,
    distributed drugs, [and were] in the presence of drugs
    connected to the conspiracy.” Gaskins, 690 F.3d at 577; see
    also United States v. Shi, 
    991 F.3d 198
    , 207 (D.C. Cir. 2021)
    (distinguishing Gaskins as a case in which there was an
    “overwhelming lack of evidence”).
    For these reasons, the evidence is sufficient to sustain the
    convictions of Samuels and Tucker.
    IX
    Tucker also challenges his sentence, arguing that the
    district court erred in calculating the quantity of heroin
    attributable to him for purposes of setting his Sentencing
    35
    Guidelines range. Although the district court’s calculation was
    based on inferences, those inferences were reasonable in light
    of the record.
    We “review[] a sentence imposed under the Guidelines to
    determine whether it is ‘reasonable.’” United States v. Flores,
    
    995 F.3d 214
    , 219 (D.C. Cir. 2021) (quoting United States v.
    Blalock, 
    571 F.3d 1282
    , 1285 (D.C. Cir. 2009)). This
    determination involves two steps: First, we ensure the district
    court did not commit a “significant procedural error,” and
    second, we review whether the sentence is objectively
    reasonable. United States v. Settles, 
    530 F.3d 920
    , 923 (D.C.
    Cir. 2008) (quoting Gall v. United States, 
    552 U.S. 38
    , 51
    (2007)).     Tucker challenges only the district court’s
    methodology for calculating the drug quantity attributable to
    him — a procedural error. Significant procedural errors
    include “failing to calculate (or improperly calculating) the
    [Sentencing] Guidelines range, . . . selecting a sentence based
    on clearly erroneous facts, or failing to adequately explain the
    chosen sentence.” Gall, 
    552 U.S. at 51
    .
    A defendant’s sentence for a drug conspiracy is based on
    the amount of drugs attributed to him. Under the Sentencing
    Guidelines, a defendant’s base offense level is derived from his
    “relevant conduct,” which includes the drug quantity involved
    for an offense. U.S.S.G. § 1B1.3 (2018) (cleaned up); United
    States v. Burnett, 
    827 F.3d 1108
    , 1120 (D.C. Cir. 2016). When
    necessary, such as when there has been “no drug seizure or the
    amount seized does not reflect the scale of the offense,” the
    district court must approximate the drug quantity. U.S.S.G.
    § 2D1.1 cmt. n.5. Further, when a defendant is part of a drug
    conspiracy, his relevant conduct includes “all reasonably
    foreseeable acts and omissions of others in furtherance of the
    jointly undertaken criminal activity.” United States v. Bostick,
    
    791 F.3d 127
    , 158 (D.C. Cir. 2015) (quoting U.S.S.G.
    36
    § 1B1.3(a)(1)(B)).      “We review the District Court’s
    determination of drug quantity relevant for sentencing under a
    clear error standard.” United States v. Mack, 
    841 F.3d 514
    , 527
    (D.C. Cir. 2016).
    The district court attributed 75 grams of heroin to Tucker.
    Although the presentence report found Tucker’s relevant
    conduct included 546.7 grams due to his involvement in the
    conspiracy, the district court declined to hold Tucker
    responsible for all the sales made from the barbershop or to
    Clark. Instead, it estimated the amount of heroin for which
    Tucker was personally responsible. Based on the amount of
    heroin sold by Tucker to the confidential informant (0.58
    grams), the GPS data, Clark’s testimony, and surveillance, the
    district court estimated that Tucker sold 0.5 grams of heroin
    five times weekly for thirty weeks, totaling 75 grams. That
    quantity resulted in a Guidelines range of 51 to 63 months, and
    with Tucker’s career offender enhancement, the range
    increased to 210 to 262 months. The district court found this
    range overstated Tucker’s criminal history, so it used the
    sentences received by other members of the conspiracy as
    benchmarks and ultimately sentenced Tucker to sixty months’
    imprisonment. The district court’s calculation of the drug
    quantity attributable to Tucker, which was based on reliable
    evidence in the record, was not clearly erroneous.
    Tucker argues the district court erred by using a method
    for calculating the drug quantity for his base offense level that
    was “unduly speculative.” Appellants’ Br. 105. We find,
    however, that the district court employed a reasonable method,
    which resulted in a conservative estimate. While it found
    “Tucker was part of a core group of individuals that operated
    out of that barbershop,” Appellee’s Supp. App. 794, it chose
    not to attribute the 546.7 grams of heroin recommended by the
    presentence report. The court instead used the amount of
    37
    heroin Tucker distributed in a single controlled buy to
    extrapolate five similarly sized sales per week for thirty weeks.
    Although one sale is a small sample size, that does not render
    the court’s extrapolation unduly speculative, particularly when
    it results in a conservative estimate. Cf. United States v.
    Correa-Alicea, 
    585 F.3d 484
    , 491 (1st Cir. 2009) (affirming a
    district court’s use of two controlled purchases multiplied by a
    “highly conservative” “estimate of one transaction per day”).
    In addition, the district court’s estimation that five sales per
    week were of heroin is reasonable based on Tucker’s frequent
    presence at the barbershop and the quantity of heroin seized
    there. “[D]rug quantity calculations are an art, not a science,”
    and the district court chose a reasonable method. United States
    v. Block, 
    705 F.3d 755
    , 760–61 (7th Cir. 2013) (explaining “we
    afford trial courts some room for speculation and reasonable
    estimation so long as percentages and quantities were not
    pulled out of thin air”) (cleaned up).
    In sum, the district court did not clearly err in calculating
    the drug quantity attributable to Tucker.
    X
    For the foregoing reasons, we affirm.
    So ordered.