United States v. Banks , 761 F.3d 1163 ( 2014 )


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  •                                                            FILED
    United States Court of Appeals
    Tenth Circuit
    PUBLISH           August 4, 2014
    Elisabeth A. Shumaker
    UNITED STATES COURT OF APPEALS          Clerk of Court
    TENTH CIRCUIT
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.
    No. 11-1487
    DAVID A. BANKS,
    Defendant - Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.                                           No. 11-1488
    KENDRICK BARNES,
    Defendant - Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.
    No. 11-1489
    DEMETRIUS K. HARPER, a/k/a Ken
    Harper,
    Defendant - Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.
    No. 11-1490
    CLINTON A. STEWART, a/k/a C.
    Alfred Stewart,
    Defendant - Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.                                              No. 11-1491
    GARY L. WALKER,
    Defendant - Appellant.
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.                                              No. 11-1492
    DAVID A. ZIRPOLO,
    Defendant - Appellant.
    Appeal from the United States District Court
    for the District of Colorado
    (D.C. No. 1:09-CR-00266-CMA)
    2
    Charles Henry Torres of Charles H. Torres, P.C., Denver, Colorado, on the briefs
    for Defendant-Appellant David A. Banks.
    Gwendolyn Maurice Solomon, Colorado Springs, Colorado, and Joshua Sabert
    Lowther of the National Federal Defense Group, Savannah, Georgia, on the briefs
    for Defendants-Appellants Kendrick Barnes, Demetrius K. Harper, Clinton A.
    Stewart, Gary L. Walker, and David A. Zirpolo.
    John F. Walsh, United States Attorney, James C. Murphy, Assistant United States
    Attorney, and Matthew T. Kirsch, Assistant United States Attorney, Denver,
    Colorado, on the brief for Plaintiff-Appellee.
    Before HARTZ, BALDOCK, and HOLMES, Circuit Judges.
    HOLMES, Circuit Judge.
    Defendants-Appellants David A. Banks, Kendrick Barnes, Demetrius K.
    Harper, Clinton A. Stewart, Gary L. Walker, and David A. Zirpolo (collectively
    “Defendants”) were convicted following a jury trial in the District of Colorado of
    multiple counts of mail fraud and wire fraud in violation of 18 U.S.C. §§ 1341
    and 1343, and conspiracy to commit mail fraud and wire fraud in violation of 18
    U.S.C. § 1349. 1 Defendants were sentenced to terms of imprisonment ranging
    1
    Defendants asked us to forgo oral argument and to decide their appeals
    based on their written submissions, and the government did not oppose their request.
    After examining the appellate record, this three-judge panel decided unanimously that
    oral argument would not be of material assistance in the determination of these appeals,
    so it granted Defendants’ unopposed request. See Fed. R. App. P. 34(a)(2); 
    id. § 34(f);
    10th Cir. R. 34.1(G). The case is therefore ordered submitted without oral argument.
    3
    from 87 to 135 months. Defendants assert the following four issues on appeal:
    (1) their right to a speedy trial was violated when the district court granted
    multiple continuances of the trial date (at Defendants’ request); (2) the district
    court compelled co-Defendant Barnes to testify in violation of his Fifth
    Amendment privilege against self-incrimination and failed to give a proper
    curative instruction; (3) the district court abused its discretion in excluding the
    testimony of two witnesses Defendants sought to call at trial; and (4) the
    cumulative effect of the district court’s otherwise harmless errors prejudiced them
    and requires reversal. 2 Exercising our jurisdiction under 28 U.S.C. § 1291, we
    affirm.
    I3
    Defendants operated or were associated with the entities Leading Team,
    Inc. (“LT”) and DKH, Inc. (“DKH”). LT and DKH were formed to produce and
    assist in the production of software. In 2003, Defendants stopped operating LT
    2
    During the briefing phase of this litigation, all Defendants were represented
    by the same attorneys, except for Mr. Banks. The non-Banks Defendants filed a joint
    opening brief, styled “Appellants’ Principal Brief,” and a reply brief, styled “Appellants’
    Reply Brief.” Through his separate counsel, Mr. Banks filed his own opening and reply
    briefs. After briefing was concluded, Mr. Banks’s counsel withdrew with permission of
    the court, and one of the lawyers for the other Defendants entered an appearance on Mr.
    Banks’s behalf. The government filed one consolidated answer brief, addressing the
    arguments of all Defendants.
    3
    We set forth here the relevant background facts. Given the fact-sensitive
    nature of the issues raised on appeal, we provide additional factual information relevant to
    each issue in the section to which the facts pertain.
    4
    and began operating a third entity, IRP Solutions Corporation (“IRP”). IRP was
    formed to produce computer software, including a software program called Case
    Investigative Life Cycle (“CILC”), that would supposedly provide a nationally
    accessible database for law-enforcement agencies, “computerize their systems,”
    and “prevent hacking and identity theft.” R., Vol. 2, at 1288 (Jury Trial Tr.,
    dated Sept. 29, 2011) (Test. of Karen Chavez of Today’s Office Staffing); see
    also 
    id. at 845
    (Jury Trial Tr., dated Sept. 27, 2011) (explanation of co-Defendant
    Harper that he intended the software to “help our men and women on the front
    lines against terrorism, against cyber crimes, to help them do their jobs better”);
    
    id. at 862–63
    (explanation of co-Defendant Stewart that he expected the software
    to eliminate “process inefficiencies, like the ones that law enforcement officials
    did not connect the dots from one piece of intelligence information to another,
    which was the route that caused 9/11”). Mr. Walker was the President of IRP,
    Mr. Banks was the Chief Operating Officer, and the remaining Defendants held
    other executive positions.
    Beginning around October of 2002, acting on behalf of DKH, LT, and IRP,
    Defendants contacted numerous staffing agencies to “assist in providing
    temporary services.” 
    Id. at 1638
    (Jury Trial Tr., dated Oct. 3, 2011) (Test. of
    Courtney Mullen of The Computer Merchants). Most of these staffing companies
    provide two core services: “staff augmentation and payrolling.” 
    Id. at 2619
    (Jury
    Trial Tr., dated Oct. 12, 2011) (Test. of Joseph Thurman of Innovar Group). In
    5
    the first type of transaction—staff augmentation—“clients” like Defendants’
    entities “ask for certain skills,” and the staffing company’s “recruiters . . . find
    candidates” with those skills “and then place them on assignment.” 
    Id. at 1015
    (Jury Trial Tr., dated Sept. 28, 2011) (Test. of Donald Crockett of CTG, Inc.). By
    contrast, in the second type of transaction—payrolling—the client has already
    pre-selected individuals it would like the staffing company to retain. The staffing
    company therefore simply hires those individuals for the client and subsequently
    pays those employees’ wages and handles their taxes and workers’ compensation.
    
    Id. at 741–42
    (Test. of Renee Rodriquez of Express Employment Professionals);
    see 
    id. at 693
    (Test. of Scott Tait of Adecco) (“Payrolling is where the company
    already knows who they want to hire, they run it through us as W2’d employees,
    so that they are covered under their insurance and workman’s comp,
    unemployment and the risk liability.”). The staffing company receives a premium
    for its services in both of these transactions. However, because in a payrolling
    transaction the staffing company is “not doing as much work,” its “profit margin
    is significantly lower.” 
    Id. at 1507
    (Jury Trial Tr., dated Sept. 30, 2011) (Test. of
    Susan Slakey of ESG Consulting).
    As is relevant here, witnesses from multiple staffing companies testified
    that a Defendant (or someone acting as Defendants’ agent) approached them and
    expressed the desire for payrolling services. One exemplar transaction, as
    described by a representative of ESG Consulting, arose when Mr. Banks, on
    6
    behalf of IRP, contacted ESG regarding “a project that [IRP] wanted ESG to
    support them with by bringing in a consultant to do some technical work.” 
    Id. at 1476.
    In that particular transaction, Mr. Banks requested that ESG retain “[t]he
    services of Kendrick Barnes” for IRP. 4 
    Id. at 1477.
    No doubt aware that
    payrolling “isn’t that lucrative for the [staffing] company,” 
    id. at 1639,
    Mr. Banks
    assured ESG that IRP was developing software for “Homeland Security, FBI and
    [the] police,” 
    id. at 1476.
    He did so presumably to signify that IRP’s “business
    was to grow,” 
    id. at 1639,
    and that, because IRP “had money coming in through
    the software they were developing for Homeland Security and other government
    entities,” 
    id. at 1491,
    ESG (and the other staffing companies) could expect more
    lucrative transactions with IRP in the future. See also 
    id. at 1400
    (Test. of
    Gregory Krueger of Agile 1) (explaining that, from his company’s perspective, if
    Defendants’ companies “were actually in business and engaging in a source of
    revenue, then we knew we were going to be paid for providing our payrolling
    service”); 
    id. at 1414
    (noting that co-Defendants Stewart and Harper “led [his
    staffing company] to believe that the business was being conducted” and “that
    4
    Similarly, an area director of staffing company Adecco explained that
    Adecco’s practice is to “marry” clients (meaning companies like IRP, DKH, and LT) with
    “contractors” (meaning employees). R., Vol. 2, at 692. He testified that Mr. Banks
    contacted Adecco on behalf of LT because “he needed a team of software engineers” to
    help with “a project that was close to completion,” 
    id. at 695—viz.,
    a software project.
    Thus, under that arrangement, Adecco’s function was to “marry” the client (LT) with the
    “contractors.” And in this transaction, the “contractors” Mr. Banks wanted Adecco to
    hire for LT were individuals affiliated with DKH. See 
    id. at 697.
    7
    DKH was invoicing a [law-enforcement] client and getting paid for the work it
    was performing” vis-à-vis software development).
    In other words, the staffing-company witnesses testified that they were
    induced into believing that Defendants’ companies were either doing business
    with major law-enforcement agencies or were on the verge of selling CILC
    software to these agencies. These witnesses also testified that Defendants (or
    Defendants’ agents) assured them that this alleged law-enforcement business
    would enable Defendants’ companies to pay the staffing companies’
    invoices—and, critically, that they relied on these representations in choosing to
    do business with Defendants. See, e.g., 
    id. at 726
    (affirming that “[we] made a
    decision to engage in business based on . . . contacts [Defendants] may have
    had”); 
    id. at 763
    (noting that the effect of Defendants’ representations concerning
    law-enforcement contacts was “[a] large one” because those government agencies
    are considered “stable customers”). As a result, the staffing companies agreed to
    hire Defendants’ pre-selected contract employees and pay their salaries. For
    example, in the situation detailed above, ESG hired Mr. Barnes “as a W2
    employee, which means [ESG was] responsible for paying him, for paying all
    payroll taxes and statutory insurance and taxes on him.” 
    Id. at 1482.
    Trial testimony from representatives of the law-enforcement agencies with
    whom Defendants claimed to be doing business—including the Department of
    Homeland Security (“DHS”), the New York City Police Department (“NYPD”),
    8
    and the Department of Justice (“DOJ”)—revealed the falsity of Defendants’
    representations to the staffing companies. These witnesses averred that
    Defendants’ companies had not, in fact, sold CILC software to their respective
    agencies and, moreover, that Defendants lacked any basis for believing that any
    such sales were imminent. See 
    id. at 1135
    (Test. of Paul Tran of DHS)
    (answering “no” to the question, “[D]id you make any representations that [DHS]
    would buy the CILC software?”); 
    id. at 2977–78
    (Jury Trial Tr., dated Oct. 17,
    2011) (Test. of Steven Cooper of DHS) (answering “no” to the question,
    “[W]ould you have made any statements that would have suggested that [DHS]
    was going to buy their software?”).
    The cracks in the foundation of misrepresentations constructed by
    Defendants began to show when the time came for the staffing companies to be
    compensated by Defendants’ companies for having paid the contract employees’
    wages. Seeking remuneration for their services, the staffing companies would
    send invoices to Defendants’ companies to cover the wages and a small markup.
    See, e.g., 
    id. at 697
    (“Adecco paid [the employees of] DKH. . . . And Leading
    Team was supposed to pay Adecco.”); 
    id. at 2169
    (Jury Trial Tr., dated Oct. 5,
    2011) (Test. of U.S. Att’y Auditor) (describing invoices relating to “Leading
    Team account”). When Defendants did not pay the invoices, they initially
    attempted to fend off the staffing companies’ collection efforts by explaining that
    they were “working with the government, and . . . waiting on some payments”
    9
    because of “how slow the government could be.” 5 
    Id. at 752.
    Stated otherwise,
    when questioned about their failure to pay the staffing companies’ invoices,
    Defendants gave false assurances that payment would be forthcoming, and they
    continued to imply that they were doing business with large government law-
    enforcement agencies.
    Evidence adduced at trial also demonstrated that Defendants employed
    various tactics to prevent the victim companies from learning that they would not
    be paid. Most notably, Defendants used entities they controlled as references in
    credit applications, see 
    id. at 1478
    (noting that Mr. Banks provided “DKH” as a
    credit reference); submitted time cards to staffing companies in which they
    reported time using various aliases, see 
    id. at 2059
    (Test. of FBI Agent Eric
    Black) (directing the jury’s attention to “the name in parentheses next to Rico
    Howard called Clint Stewart”); and reported overlapping hours for the same
    employee at multiple staffing companies, see 
    id. at 2383–88
    (Jury Trial Tr., dated
    Oct. 7, 2011) (Test. of software developer William Williams) (providing the
    example that Mr. Barnes reported working a total of twenty-four or more hours in
    5
    At other times, these interactions were significantly more contentious.
    Kathryn Losey-Miller of staffing company AppleOne described such a situation: she
    called Mr. Banks to discuss a meeting IRP purportedly had with the NYPD, i.e., “did he
    close the contract . . . [d]id he have the money . . . , and when could [the staffing
    company] expect payment.” R., Vol. 2, at 1064. Mr. Banks grew very angry with her for
    asking if he had been paid by his supposed law-enforcement contacts. See 
    id. As Ms.
    Losey-Miller recited the conversation, she countered, “I am calling to ask for money
    because we[, AppleOne,] have been payrolling your people . . . [and] deserve to be paid.”
    
    Id. at 1065.
    10
    a day for three different staffing companies on approximately twenty-three
    different days).
    In the end, forty-two different staffing companies were left with
    outstanding invoices totaling in excess of $5,000,000—amounts Defendants’
    companies had not paid (and apparently could not pay), and which could not be
    submitted to the government agencies, which had no business relationship with
    Defendants’ companies.
    On June 9, 2009, Defendants were indicted on multiple counts of
    conspiracy to commit mail fraud and wire fraud, and committing mail fraud and
    wire fraud, in violation of 18 U.S.C. §§ 1349, 1341, and 1343. Trial commenced
    on September 26, 2011. Although Defendants were represented by counsel prior
    to trial, they elected to proceed pro se during trial. 6 On October 20, 2011, the
    6
    Prior to trial, beginning in July 2009, Mr. Banks’s co-defendants began
    expressing their wish to join in his various filings. See, e.g., R., Vol. 1, at 82 (Mot. to
    Join, filed July 7, 2009) (reflecting Mr. Zirpolo’s request to “join and adopt motions filed
    by [Mr.] Banks as they may apply to [him]”). Subsequent motions filed by Mr. Banks
    were accompanied by similar requests from his co-defendants to join. No doubt
    attempting to improve the efficiency in a multi-defendant lawsuit, the district court gave
    its blessing to Defendants’ efforts to join in one another’s arguments at various stages of
    the litigation. See, e.g., 
    id., Vol. 2,
    at 41 (Status Conf. Tr., dated Dec. 18, 2009) (“I think
    it would be much more useful to have the joint motions.”); 
    id. at 56
    (“[I]t makes my job a
    lot easier if I don’t have to comb through six motions, and I can do one that you all jointly
    agreed to. So I will allow that in this case.”). Notably, with respect to their statutory and
    constitutional speedy-trial claims, the district court explicitly declared that it would “give
    [non-Banks] Defendants the benefit of the doubt and construe their motion as
    ‘incorporating’ Defendant Banks’ motion.” 
    Id., Vol. 1,
    at 1594 n.1 (Order Den. Mots. to
    (continued...)
    11
    jury returned guilty verdicts as to all Defendants on one or more counts of mail
    fraud and wire fraud, and conspiracy to commit mail fraud and wire fraud. This
    consolidated appeal followed.
    II
    Defendants assert four issues on appeal. 7 First, Defendants argue that the
    6
    (...continued)
    Dismiss, filed June 28, 2012). As indicated, at trial Defendants represented themselves.
    And the district court understood them to be presenting “a joint defense,” 
    id. at 1579
    (Order Den. Mot. for J. of Acquittal & Alt. Mot. for New Trial Based on Fifth Amend.
    Violations, filed June 28, 2012), as expressly reflected in the court’s rulings on certain
    contested matters, see 
    id., Vol. 2,
    at 2341 (excluding the testimony of two witnesses as a
    discovery sanction because “[D]efendants ha[d] not offered any legitimate reasons for
    failing to submit their Rule 16 disclosures” regarding them). In light of the foregoing,
    we, too, proceed on the premise that Defendants mounted a unified defense before the
    district court; thus, insofar as one Defendant properly lodged an objection, he shall be
    deemed to have preserved the challenged matter for appeal as to all Defendants.
    7
    Defendants seem intent on proceeding collectively on appeal as they did
    before the district court—specifically, by adopting each other’s arguments for reversal.
    Compare Aplts.’ Principal Br. at 64 (noting that non-Banks Defendants “adopt by
    reference the Argument in Appellant Banks’ Opening Brief”), with Banks’s Opening Br.
    at 1 (noting that he “adopts by reference . . . co-Defendants’ arguments”). The skeletal
    remarks to that effect in their briefs fall far short of optimal practice and do not provide us
    with much “direction[,] . . . specifically, how the [particular] argument applies to the
    adopting Defendant.” United States v. Renteria, 
    720 F.3d 1245
    , 1251 (10th Cir. 2013),
    cert. denied, --- U.S. ----, 
    134 S. Ct. 969
    (2014). However, given the nature of the
    scheme and, more generally, the factual context of this case, we are able to perceive “a
    clear and straightforward application” of the legal principles at issue to the circumstances
    of each Defendant. 
    Id. Accordingly, we
    are willing to resolve this case on the view that
    Defendants are proceeding collectively on appeal. See United States v. Morgan, 
    748 F.3d 1024
    , 1035 n.13 (10th Cir. 2014) (“Mr. Ford . . . attempted to join the entirety of the other
    Defendants’ briefs without explaining how the arguments apply to him. Generally, [t]his
    is problematic because it requires the court to sift through the briefing and record and
    (continued...)
    12
    district court violated their statutory and constitutional rights to a speedy trial by
    granting four continuances that were requested by Defendants. Second,
    Defendants contend that the district court compelled co-Defendant Barnes to
    testify in violation of the Fifth Amendment privilege against self-incrimination,
    thereby prejudicing all Defendants, and failed to give a proper curative
    instruction. Third, Defendants argue that the district court abused its discretion in
    excluding the testimony of two purported expert witnesses. And, finally,
    Defendants contend that the cumulative effect of the district court’s otherwise
    harmless errors prejudiced them and constitutes reversible error. We address each
    of these arguments in turn.
    A
    We review the denial of a motion to dismiss for violation of the Speedy
    Trial Act (the “Act”) for abuse of discretion. See United States v. Thompson, 
    524 F.3d 1126
    , 1131 (10th Cir. 2008). We also review the decision to grant an ends-
    of-justice continuance for abuse of discretion. See United States v. Toombs, 
    574 F.3d 1262
    , 1268 (10th Cir. 2009). In other words, we review the district court’s
    7
    (...continued)
    imagine which arguments might apply to which Defendants. In this instance, however,
    because Mr. Sanford’s and Mr. Morgan’s arguments can apply to Mr. Ford, we consider
    this issue as to him.” (alteration in original) (citation omitted) (internal quotation marks
    omitted)). Consequently, we deem the four arguments before us as being advanced by
    each Defendant.
    13
    compliance with the legal requirements of the Act de novo and its underlying
    factual findings for clear error. See 
    id. “We review
    [a defendant’s] Sixth
    Amendment [speedy-trial] claim de novo, but accept the district court’s factual
    determinations unless clear error is shown.” United States v. Gould, 
    672 F.3d 930
    , 935 (10th Cir. 2012); accord United States v. Madden, 
    682 F.3d 920
    , 929
    (10th Cir. 2012); see also United States v. Larson, 
    627 F.3d 1198
    , 1207 (10th Cir.
    2010) (“[Defendant’s] claim that his Sixth Amendment speedy trial right was
    violated is reviewed de novo.”).
    Defendants first argue that their statutory right to a speedy trial, under 18
    U.S.C. § 3161(c)(1), was violated when the district court granted multiple
    continuances of their trial date. Defendants also argue that their Sixth
    Amendment right to a speedy trial was violated. We begin by addressing whether
    Defendants’ statutory right to a speedy trial was violated, and then proceed to
    address the separate question of whether Defendants’ constitutional right to a
    speedy trial was violated.
    1
    The Speedy Trial Act requires that a federal criminal trial commence within
    seventy days of the filing of the indictment or the defendant’s initial appearance,
    whichever occurs later. See 18 U.S.C. § 3161(c)(1); 
    Toombs, 574 F.3d at 1268
    .
    The Act excludes from this seventy-day period, inter alia, “[a]ny period of delay
    14
    resulting from a continuance . . . if the judge granted such a continuance on the
    basis of his findings that the ends of justice served by taking such action
    outweigh the best interest of the public and the defendant in a speedy trial.” 18
    U.S.C. § 3161(h)(7)(A). A court is required to set forth on the record, either
    orally or in writing, its reasons for making such a determination. See 
    id. We have
    repeatedly noted that an ends-of-justice continuance is “meant to be a rarely
    used tool for those cases demanding more flexible treatment,” 
    Toombs, 574 F.3d at 1269
    (quoting United States v. Doran, 
    882 F.2d 1511
    , 1515 (10th Cir. 1989))
    (internal quotation marks omitted), and “should not be granted cavalierly,” United
    States v. Williams, 
    511 F.3d 1044
    , 1049 (10th Cir. 2007).
    In determining whether to grant an ends-of-justice continuance, the district
    court must consider the factors listed in 18 U.S.C. § 3161(h)(7)(B). These factors
    include:
    (i)     Whether the failure to grant such a continuance in the
    proceeding would be likely to make a continuation of such
    proceeding impossible, or result in a miscarriage of
    justice[;]
    (ii)    Whether the case is so unusual or so complex, due to the
    number of defendants, the nature of the prosecution, or the
    existence of novel questions of fact or law, that it is
    unreasonable to expect adequate preparation for pretrial
    proceedings or for the trial itself within the time limits
    established by this section[;]
    (iii)   Whether, in a case in which arrest precedes indictment,
    delay in the filing of the indictment is caused because the
    15
    arrest occurs at a time such that it is unreasonable to
    expect return and filing of the indictment within the period
    specified in section 3161(b), or because the facts upon
    which the grand jury must base its determination are
    unusual or complex[; and]
    (iv)   Whether the failure to grant such a continuance in a case
    which, taken as a whole, is not so unusual or so complex
    as to fall within clause (ii), would deny the defendant
    reasonable time to obtain counsel, would unreasonably
    deny the defendant or the Government continuity of
    counsel, or would deny counsel for the defendant or the
    attorney for the Government the reasonable time necessary
    for effective preparation, taking into account the exercise
    of due diligence.
    18 U.S.C. § 3161(h)(7)(B).
    “[T]he record must clearly establish [that] the district court considered the
    proper factors at the time such a continuance was granted.” 
    Larson, 627 F.3d at 1204
    (alterations in original) (quoting 
    Toombs, 574 F.3d at 1269
    ) (internal
    quotation marks omitted). “If the district court fails to consider these factors, the
    continuance ‘period cannot be excluded under the Act’s ends-of-justice
    provision.’” 
    Id. (quoting Williams
    , 511 F.3d at 1057). Similarly, if the court fails
    to make its findings on the record, “there can be no exclusion . . . [and] the delay
    resulting from the continuance must be counted.” 
    Id. (quoting Zedner
    v. United
    States, 
    547 U.S. 489
    , 507–08 (2006)) (internal quotation marks omitted); see also
    United States v. Occhipinti, 
    998 F.2d 791
    , 797 (10th Cir. 1993) (“[T]he trial court
    must make explicit findings regarding why granting the continuance will strike a
    16
    proper balance between the ends of justice and the best interest of the public and
    the defendant in a speedy trial.”). Although the record “must explain ‘why the
    mere occurrence of the event identified by the party as necessitating the
    continuance results in the need for additional time,’” 
    Larson, 627 F.3d at 1204
    (quoting 
    Toombs, 574 F.3d at 1271
    ), “the district court need not articulate facts
    which are obvious and set forth in the motion for the continuance itself,” id.
    (quoting 
    Toombs, 574 F.3d at 1269
    ) (internal quotation marks omitted).
    With this framework in mind, we turn now to the four continuances at
    issue.
    1.    Continuance Granted on July 9, 2009
    On July 6, 2009, then-counsel for co-Defendant Banks filed an unopposed
    motion for an ends-of-justice continuance of ninety days under 18 U.S.C.
    § 3161(h). In support of the motion, Mr. Banks made the following allegations:
    (1) the investigation into Defendants’ conduct spanned multiple years and
    involved several federal agencies; (2) the indictment contained twenty-five counts
    and listed six defendants and forty-two separate victims; (3) Defendants had been
    informed by the government that discovery materials occupied approximately
    thirty boxes, which the government was working to organize and scan into a
    digital format; (4) the government had informed defense counsel that discovery
    would be made available in stages, with an expected completion date of July 27,
    17
    2009; and (5) it was unreasonable to expect adequate preparation for pretrial
    proceedings or for the trial itself by the September 1, 2009, speedy-trial deadline
    due to the voluminous discovery, multiple defendants, and complex nature of the
    allegations in the matter.
    On July 9, 2009, the district court issued a written order granting the
    motion for a continuance pursuant to 18 U.S.C. § 3161(h)(8)(A). As the basis for
    its order, the court found as follows:
    Due to the voluminous discovery, multiple defendants, and
    complex nature of the allegations in this matter, denying the
    requested continuance would result in a miscarriage of justice by
    denying Defendants an adequate opportunity to prepare for trial,
    despite the exercise of due diligence. Pursuant to 18 U.S.C.
    § 3161(h)(8)(A) and (B)(ii), the ends of justice that will be
    served by excluding the requested period of continuance from the
    speedy trial calculation outweigh the best interests of the public
    and the Defendants in a speedy trial.
    R., Vol. 1, at 89–90 (Order Granting Continuance, filed July 9, 2009).
    Defendants now contend that the ninety-day continuance should not have
    been granted because: (1) defense counsel had yet to receive discovery; (2) the
    court failed to hold a hearing on the matter; (3) the government failed to voice
    any opposition to the motion; and (4) the court could not have known whether the
    case was complex as of the date the motion was granted. We do not find
    Defendants’ assertions persuasive. Rather, we find that the facts alleged in
    Defendants’ motion warranted the district court’s issuance of a continuance. As
    18
    detailed in Defendants’ motion, the investigation underlying the charges at issue
    spanned several years, involved the production of thousands of documents, and
    implicated Defendants in crimes involving forty-two victim companies. Thus, it
    was reasonable for the court to conclude that Defendants required additional time
    in order to effectively prepare for trial. See United States v. Spring, 
    80 F.3d 1450
    , 1457 (10th Cir. 1996) (recognizing that “[a]dequate preparation time . . .
    [is] clearly [a] permissible reason[] for granting a continuance and tolling the
    Speedy Trial Act”).
    Moreover, it was not necessary for the district court to conduct a hearing,
    given that the facts alleged in the motion were undisputed. The district court’s
    order makes clear that it properly considered the required statutory factors and
    determined that the ends of justice would be served by granting a ninety-day
    continuance. For these reasons, we conclude that the district court’s grant of a
    ninety-day continuance was not an abuse of discretion.
    2.     Continuance Granted on August 20, 2009
    On August 18, 2009, co-Defendant Stewart filed an unopposed motion
    under 18 U.S.C. §§ 3161(h)(7)(A) and (B), seeking an ends-of-justice continuance
    of 110 days. All Defendants concurred in the motion. In support of the motion,
    Mr. Stewart alleged, inter alia, that: (1) the FBI investigation of Defendants
    began on March 25, 2004 and resulted in a search of Defendants’ offices on
    19
    February 9, 2005; (2) the affidavit supporting the search included reports from ten
    witness interviews and indicated that thirty-three employees of Defendants’
    companies were staffed through victim companies; (3) the search involved as
    many as twenty law-enforcement officers and spanned a period of over fourteen
    hours; (4) over twenty boxes of paper documents were seized during the search of
    Defendants’ offices; (5) the government made electronic copies of the hard drives
    of seven computer servers and over forty individual computers, resulting in
    approximately 1.8 terabytes of electronic data; (6) discovery produced by the
    government consisted of approximately 20,000 scanned images, which Defendants
    were continuing to review at that time; (7) the indictment charged a conspiracy
    involving forty-two victim companies, requiring defense counsel to investigate
    and interview witnesses regarding events that occurred over a nearly seven-year
    time period; (8) defense counsel estimated that it would need to conduct nearly
    one hundred interviews during the pretrial preparation period; and (9) Defendants
    needed to review the discovery materials and interview witnesses in order to
    effectively prepare for trial, and this could not be reasonably completed by
    October 7, 2009, taking into account the exercise of due diligence. See R., Vol.
    1, at 98 (Mot. for Excl. of Time, filed Aug. 18, 2009) (noting, with regard to
    interviews, that this “[was] a conservative estimate” of what would be necessary).
    At the August 20, 2009, status conference, the district court considered
    20
    Defendants’ motion and made oral findings that the ends of justice would be
    served by granting the requested continuance. During the hearing, the court
    confirmed with the government that the factual allegations set forth in
    Defendants’ motion were accurate and that all parties believed a continuance was
    necessary in order to allow Defendants to adequately prepare for trial.
    The court then made the following factual findings: (1) Defendants were
    charged with engaging in a complex financial scheme occurring over a seven-year
    period; (2) defense counsel was in the process of reviewing extensive discovery
    involving thousands of pages of documents and needed to conduct between fifty
    and one hundred witness interviews; and (3) defense counsel and the government
    had been “diligent in conforming to their discovery obligations and obtaining the
    appropriate witnesses.” 
    Id., Vol. 2,
    at 27 (Status Conf. Tr., dated Aug. 20, 2009).
    The court then expressly concluded that the ends of justice served by granting the
    continuance outweighed the interest of the public and Defendants in a speedy
    trial, and that the failure to grant the continuance “would likely result in a
    miscarriage of justice by precluding [D]efendants from adequately preparing for
    trial,” most notably by preventing Defendants from “thoroughly reviewing the
    20,000 scanned images produced by the Government in July of 2009, and
    unreasonably limiting [D]efendants’ ability to interview the necessary witnesses,
    including law enforcement officers and employees of the companies involved.”
    21
    
    Id. at 28.
    The court further concluded that the case was “so unusual and complex
    that it would be unreasonable” to expect Defendants to prepare for trial within the
    time limits set forth by the Act and the district court’s previous order. 
    Id. In addition
    to making the above findings and conclusions, the court questioned
    defense counsel regarding when they would be prepared to file pretrial motions
    and to set a trial date.
    Thus, contrary to Defendants’ assertions, the court fully set forth the bases
    for granting the continuance and supported its conclusions with detailed factual
    findings. As such, the district court did not violate Defendants’ rights under the
    Act by granting the continuance and excluding 110 days from the speedy-trial
    calculations.
    3.       Continuance Granted on December 18, 2009
    On December 14, 2009, defense counsel jointly moved for an additional
    ends-of-justice continuance of 361 days. In their motion, Defendants set forth
    “particularized facts supporting the requested exclusion of time,” 
    id., Vol. 1,
    at
    103 (Joint Mot. for Excl. of Time, filed Dec. 14, 2009) (capitalization altered),
    and recited factual details regarding the extensive amount of discovery required,
    the number of witnesses involved, and the length of the government’s
    investigation, see 
    id. at 103–07.
    The motion also recited how Defendants had
    used the previous 110-day period excluded by the court and why Defendants
    22
    needed additional time to prepare for trial.
    Specifically, Defendants alleged, inter alia, that: (1) due to the volume of
    material produced during discovery, it was not enough for Defendants to merely
    review the material; rather, the documents—including emails, letters, FBI 302
    reports, and civil pleadings—needed to be cross-referenced in order to be
    reviewed, compared, and contrasted; (2) Defendants needed additional time to
    learn and become familiar with industry and government practices; (3) review of
    the discovery to date revealed at least 130 potential witnesses, many of whom
    were located outside of Colorado; (4) Defendants needed to obtain permission
    from the court to travel, and interviews could not be conducted until Defendants
    had reviewed enough of the discovery to have a clear understanding of the issues
    to be covered in the interviews and to fully assess any prior statements made by
    the prospective witness in those discovery materials; (5) Defendants would need
    considerable time to review any co-conspirator statements the government might
    seek to introduce pursuant to Federal Rule of Evidence 801(d)(2)(E); and (6)
    Defendants and the government had met to discuss the contents of the motion, and
    there was no dispute with respect to any of the facts set forth in the motion.
    At the next status conference, the court questioned the parties in detail
    regarding the need for the continuance. The court noted that it was “very hesitant
    to enter an order that would extend this case by almost a year, especially given
    23
    the other extensions [it had] already granted.” 
    Id., Vol. 2,
    at 35. As a result, the
    court questioned Defendants “about what ha[d] already been done in this case”
    and why they needed an additional year’s time to prepare. 
    Id. For example,
    the
    court inquired as to whether Defendants had “devised a system where . . . [they
    were] not duplicating efforts,” 
    id. at 39,
    and confirmed that the government did
    not dispute the amount of time Defendants estimated they needed to review
    documents and prepare for trial, see 
    id. at 41–42,
    and that the amount of time
    requested was consistent with what the government had “seen defense attorneys
    request and receive and use in order to work on preparing motions in a case like
    this,” 
    id. at 42.
    The government also noted that having this additional time would
    ultimately promote efficiency, as there were “a number of witnesses” involved in
    the case, and being able to issue subpoenas “well in advance” would be helpful in
    ensuring the witnesses’ availability. 
    Id. at 44.
    In addition, the district court
    heard detailed arguments regarding the amount of discovery at issue, the need to
    retain computer experts, the need to coordinate with witnesses and counsel, and
    the difficulties faced by the defense in getting up to speed on an investigation that
    had been conducted over a period of several years.
    Based on the “very well drafted joint motion” and the arguments presented
    at the status conference, the district court concluded that the ends of justice would
    24
    be served by granting the requested continuance. 
    Id. at 44–45.
    The court then
    worked with the parties to establish a detailed schedule setting forth specific
    deadlines for upcoming motions and hearing dates. After setting a schedule and
    determining the amount of time needed by the parties to effectively prepare for
    trial, the court concluded:
    [T]he Court finds that for the reasons stated in detail in the joint
    motion, and for reasons further clarified here in this hearing, that
    the complexity of this case and the evidence and witnesses
    involved justify the Court making the legal conclusion that the
    ends of justice served by granting the joint motion outweigh the
    interest of the public and the defendants in a speedy trial.
    The failure to grant the joint motion would likely result in a
    miscarriage of justice by precluding the defendants from
    adequately being able to prepare for trial. And because of the
    number of the defendants and the nature of the prosecution, and
    the fact that this case involves an intricate 7 year financial
    conspiracy involving massive amounts of discovery, render this
    case so unusual and complex that it would be unreasonable to
    expect the defendants to prepare for trial in a shorter period of
    time and within the time limits set forth by the Speedy Trial Act
    and the Court’s previous orders.
    
    Id. at 54.
    Accordingly, the district court excluded 361 days from the speedy-trial
    calculations.
    Based on the above, it is clear that the court properly weighed the factors
    set forth in 18 U.S.C. § 3161(h)(7)(B) and made sufficiently detailed findings to
    support granting an ends-of-justice continuance. Although the period of time
    granted was significant—and the district court noted its concerns with granting
    25
    such a lengthy continuance—the district court properly concluded that the
    exclusion of this time was warranted based on the complexity of the case and the
    extensive preparation required.
    Defendants’ assertions to the contrary are unpersuasive. For example,
    Defendants argue that the district court’s ruling failed to comply with the
    requirements of Toombs or Bloate v. United States, 
    559 U.S. 196
    (2010).
    However, Defendants support this argument with nothing more than conclusory
    assertions that the motion was granted in a “superficial fashion” and failed to
    include the “necessary analysis.” Aplts.’ Principal Br. at 36. These assertions are
    belied by the record, which establishes that the court fully questioned the parties
    regarding the need for a continuance and made detailed findings setting forth the
    reasons that an ends-of-justice continuance was warranted.
    Similarly, Defendants’ argument that the court was required to set forth its
    findings prior to ruling, and failed to do so, is unpersuasive. All that the Act
    requires is that the findings supporting an ends-of-justice continuance be made
    contemporaneously with the granting of the continuance. See, e.g., United States
    v. Gonzales, 
    137 F.3d 1431
    , 1433 (10th Cir. 1998) (observing that “the [court’s]
    balancing must occur contemporaneously with the granting of the continuance”);
    accord United States v. Apperson, 
    441 F.3d 1162
    , 1180 (10th Cir. 2006). That is
    exactly what occurred here. Specifically, the court questioned the parties
    regarding the need for a continuance, determined that a continuance was
    26
    warranted, established the amount of time that would be needed for motions and
    hearings, and then set forth its ruling along with detailed findings supporting the
    granting of the continuance. Accordingly, the court fully complied with the
    requirements for granting an ends-of-justice continuance, and the time was
    properly excluded for purposes of the Act.
    4.     Continuance Granted on November 22, 2010
    Counsel for five of the six Defendants filed yet another motion for a
    continuance on November 18, 2010, seeking a 120-day continuance of the trial
    date. The motion was joined by five of the Defendants, and the sixth, Mr.
    Stewart, did not oppose it. In their motion, Defendants reiterated the breadth of
    discovery and noted pending brief-submission deadlines and the need for two
    defense counsel to take possibly two out-of-state trips, which would span
    approximately a week in duration, to interview witnesses. The motion also noted
    that the government’s James proffer, 8 submitted October 28, 2010, listed 401 co-
    conspirator statements, and that other items “must be reviewed and considered in
    order to put many of the designated statements into context.” R., Vol. 1, at 564
    (Joint Mot. to Continue, filed Nov. 18, 2010). The motion further noted that
    “[c]ounsel . . . ha[d] been experiencing difficulties in finding and opening” some
    8
    See United States v. James, 
    590 F.2d 575
    , 582 (5th Cir. 1979) (establishing
    the rule that a trial court should not allow the jury to hear out-of-court co-conspirator
    declarations without first holding a hearing, outside the jury’s presence, to determine
    whether such statements are admissible under Federal Rule of Evidence 801(d)(2)(E)).
    27
    of the computer discovery materials containing the statements at issue. 
    Id. In addition
    , more documents had been disclosed to Defendants on November 8,
    2010, and while the documents were not to be used by the government at trial,
    Defendants needed time to obtain, review, and analyze the documents for
    themselves.
    During the James hearing on November 19, 2010, the district court also
    addressed Defendants’ motion for a continuance and informed counsel that it
    would grant the continuance. On November 22, 2010, the district court issued an
    order to that effect stating:
    Due to the voluminous discovery, multiple defendants, and
    complex nature of the allegations in this matter, denying the
    requested continuance would result in a miscarriage of justice by
    denying Defendants an adequate opportunity to prepare for trial,
    despite the exercise of due diligence. Pursuant to 18 U.S.C.
    § 3161(h)(7)(A) and (B)(ii) and (iv), the ends of justice that will
    be served by continuing the January 31, 2011 trial date for the
    requested 120 days outweigh the best interests of the public and
    the Defendants in a speedy trial.
    
    Id. at 571–72
    (Order Granting Continuance, filed Nov. 22, 2010). The district
    court then rescheduled the final pretrial preparation conference and six-week jury
    trial accordingly.
    The district court’s November 22, 2010, order was somewhat less detailed
    than its prior orders; however, in setting forth its findings, a district court “need
    not articulate facts which are obvious and set forth in the motion for the
    continuance itself.” 
    Toombs, 574 F.3d at 1269
    (internal quotation marks
    28
    omitted); see United States v. Loughrin, 
    710 F.3d 1111
    , 1119 (10th Cir. 2013)
    (“In determining whether the district court relied on sufficient facts in granting an
    ends-of-justice continuance, [this court] can look to the oral and written
    statements of both the district court and the moving party.” (internal quotation
    marks omitted)), aff’d, --- U.S. ----, 
    134 S. Ct. 2384
    (2014). Here, Defendants’
    motion was extremely thorough and spanned numerous pages. The motion set
    forth with specificity the reasons Defendants needed more time to address
    problems with discovery materials, supplemental briefing on suppression motions,
    and witness preparation. Accordingly, even though the district court’s ruling on
    this matter was less detailed than its prior orders, when considered in conjunction
    with the facts set forth in Defendants’ motion, the order complied with the
    requirements for granting an ends-of-justice continuance, and the exclusion of an
    additional 120 days did not constitute an abuse of discretion.
    2
    Having determined that Defendants’ statutory right to a speedy trial was not
    violated, we proceed to address whether Defendants’ constitutional right to a
    speedy trial was violated. 9 The Sixth Amendment provides that “[i]n all criminal
    prosecutions, the accused shall enjoy the right to a speedy and public trial.” U.S.
    Const. amend. VI. A defendant’s constitutional speedy-trial right attaches when
    9
    “It is unusual to find a Sixth Amendment violation when the Speedy Trial
    Act has been satisfied.” United States v. Abdush-Shakur, 
    465 F.3d 458
    , 464–65 (10th Cir.
    2006); accord United States v. Sprouts, 
    282 F.3d 1037
    , 1042 (8th Cir. 2002).
    29
    he is arrested or indicted on federal charges, whichever come first. 10 See 
    Larson, 627 F.3d at 1207
    . “To determine whether a defendant’s Sixth Amendment right
    has been violated, the court balances four factors: (1) the length of the delay; (2)
    the reason for the delay; (3) the defendant’s assertion of his speedy trial right; and
    (4) whether the delay prejudiced the defendant.” 
    Id. “None of
    the factors is itself
    necessary or sufficient to conclude that the Sixth Amendment speedy trial right
    has been violated.” 
    Id. “Rather, they
    are related factors and must be considered
    together with such other circumstances as may be relevant.” United States v.
    Kalady, 
    941 F.2d 1090
    , 1095 (10th Cir. 1991) (quoting Barker v. Wingo, 
    407 U.S. 514
    , 533 (1972)) (internal quotation marks omitted).
    1.     The Length of the Delay
    “[S]imply to trigger a speedy trial analysis, an accused must allege that the
    interval between accusation and trial has crossed the threshold dividing ordinary
    10
    Prior to trial, Defendants moved to dismiss the indictment on grounds of
    “inexcusable pre-indictment delay,” R., Vol. 1, at 119 (Joint Mot., filed May 5, 2010)
    (capitalization altered), and the district court denied their request in a motions hearing on
    July 9, 2010. Defendants now purport to resurrect this issue in the context of their
    speedy-trial claims by noting: “Pre-[i]ndictment delay should be considered, as it
    impacted the continuous delays after indictment.” Banks’s Opening Br. at 17. However,
    they elaborate no further on this point such that it could fairly be considered “argument”
    under our precedent. See United States v. Wooten, 
    377 F.3d 1134
    , 1145 (10th Cir. 2004)
    (“The court will not consider . . . issues adverted to in a perfunctory manner,
    unaccompanied by some effort at developed argumentation.” (internal quotation marks
    omitted)); accord Gray v. Univ. of Colo. Hosp. Auth., 
    672 F.3d 909
    , 915 (10th Cir. 2012).
    Thus, in light of Defendants’ failure to develop any substantive pre-indictment-delay
    argument beyond this perfunctory reference, we consider the issue waived for purposes of
    appellate review and will not address it.
    30
    from ‘presumptively prejudicial’ delay.” United States v. Seltzer, 
    595 F.3d 1170
    ,
    1176 (10th Cir. 2010) (quoting Doggett v. United States, 
    505 U.S. 647
    , 651–52
    (1992)) (internal quotation marks omitted). “[I]f the accused makes this showing,
    the court must then consider, as one factor among several, the extent to which the
    delay stretches beyond the bare minimum needed to trigger judicial examination
    of the claim.” 
    Id. (quoting Doggett,
    505 U.S. at 652) (internal quotation marks
    omitted).
    Here, the length of the delay was slightly over two years. “Generally,
    delays approaching one year are presumptively prejudicial.” 
    Larson, 627 F.3d at 1208
    . “The longer the delay, the more likely it is that the first factor will weigh
    in the defendant’s favor.” 
    Id. However, in
    Seltzer, we observed that “even a two-
    year interval between charges and trial may not be deemed a ‘delay’ when the
    charges are 
    complex.” 595 F.3d at 1176
    .
    Defendants argue that “the charges were not complicated as recognized by
    the Court and supported by the record,” and that the delay was excessive given
    “the simplicity of the case.” Banks’s Opening Br. at 18. However, the record
    belies the accuracy of this statement. As set forth above, and as argued in
    Defendants’ motions for continuances, the case involved thousands of pages of
    discovery and an investigation period that spanned approximately seven years.
    The case also involved multiple defendants and over one hundred potential
    witness interviews, and the district court’s finding that the case was complex was
    31
    not clearly erroneous.
    We note that whether this factor weighs in favor of Defendants is a close
    call. On the one hand, the case involved a significant amount of time-consuming
    discovery and multiple parties. However, a delay of over two years is “twice the
    time presumed to be ordinary.” 
    Seltzer, 595 F.3d at 1176
    . Ultimately, our
    sensitivity to the presumption of prejudice that attaches to delays greater than one
    year and our willingness to give Defendants the benefit of the doubt regarding the
    proper resolution of this close issue lead us to conclude that this factor weighs in
    favor of Defendants.
    2.     The Reason for the Delay
    “The second factor, the reason for the delay, is especially important, and
    the burden is on the government to provide an acceptable rationale for the delay.”
    
    Larson, 627 F.3d at 1208
    (quoting 
    Seltzer, 595 F.3d at 1177
    ) (internal quotation
    marks omitted); see also Jackson v. Ray, 
    390 F.3d 1254
    , 1261 (10th Cir. 2004)
    (“The Supreme Court places the burden on the state to provide an inculpable
    explanation for delays in speedy trial claims.”). That being said, “[d]elays
    attributable to the defendant do not weigh against the government,” and “[w]here
    the defendant’s actions were the primary cause of the delay, the second factor
    weighs heavily against him.” 
    Larson, 627 F.3d at 1208
    (citation omitted)
    (internal quotation marks omitted).
    Here, the entirety of the delay is attributable to Defendants, who filed
    32
    multiple continuances with the district court and argued that they would be
    prejudiced if the court refused to grant them additional time to prepare. None of
    the continuances now challenged by Defendants were sought by the government.
    Accordingly, the “especially important” second factor weighs heavily against
    Defendants. Cf. United States v. Batie, 
    433 F.3d 1287
    , 1293 (10th Cir. 2006)
    (“Absent extraordinary circumstances, Barker counsels us not to find a violation
    of the right to a speedy trial when the defendant’s actions indicate he had no
    desire for a speedy trial.”).
    3.     Defendants’ Assertion of Their Right to a Speedy Trial
    “The third factor, a defendant’s assertion of his speedy trial right, is also
    given strong evidentiary weight.” 
    Larson, 627 F.3d at 1208
    . We have noted that
    “this factor weighs against a defendant who requests continuances and waits for
    months to assert his speedy trial right.” Id.; see also 
    Toombs, 574 F.3d at 1274
    –75 (holding that this factor weighed heavily against the defendant where
    many of the continuances were granted at the defendant’s request and the
    defendant waited until after the continuances to assert his right to a speedy trial).
    Here, Defendants did not demand a speedy trial until the first day of the trial
    itself. Accordingly, given that Defendants waited until trial to assert their right to
    a speedy trial, after requesting all of the continuances, this factor also weighs
    heavily against them. Accord United States v. Shepard, 
    462 F.3d 847
    , 864 (8th
    Cir. 2006) (reaching the same conclusion and noting that, “[l]ooking to the third
    33
    factor, while [Defendant] did file a motion to dismiss based on a speedy trial
    violation, he waited until the first day of trial to do so”).
    4.     Whether the Delay Prejudiced Defendants
    Defendants bear the burden of showing that they were prejudiced by the
    delay. See 
    Larson, 627 F.3d at 1208
    –09. However, “[i]n cases of extreme delay,
    the defendant may rely on the presumption of prejudice and need not present
    specific evidence of prejudice.” 
    Id. at 1209.
    “Generally, the court requires a
    delay of six years before allowing the delay itself to constitute prejudice.” 
    Id. (quoting Seltzer,
    595 F.3d at 1180 n.3) (internal quotation marks omitted).
    Accordingly, this case does not present an instance of “extreme delay,” and
    Defendants must present specific evidence of prejudice. See 
    Jackson, 390 F.3d at 1264
    (noting that “the mere ‘possibility of prejudice is not sufficient to support
    [the] position that . . . speedy trial rights [are] violated’” (alterations in original)
    (omission in original) (quoting United States v. Loud Hawk, 
    474 U.S. 302
    , 315
    (1986))).
    In determining whether a defendant has made “a particularized showing of
    prejudice,” 
    Larson, 627 F.3d at 1209
    , we have identified three main interests: “(i)
    the prevention of oppressive pretrial incarceration; (ii) the minimization of
    anxiety and concern of the accused; and (iii) minimization of the possibility that
    the defense will be impaired,” 
    Seltzer, 595 F.3d at 1179
    . We have held that the
    third interest—impairment of the defense—is the most important, and the first
    34
    interest—prevention of oppressive pretrial incarceration—is the second most
    important. See 
    Larson, 627 F.3d at 1209
    .
    Here, Defendants were not detained before trial, so the oppressive-pretrial-
    incarceration interest is of no assistance to them. Moreover, Defendants have not
    shown that their defense was impaired as a result of the delay. Rather,
    Defendants simply list record citations (without accompanying explanatory
    parentheticals) taking up over one-half of a page, which they claim support their
    contention that the delay worked to their detriment. See Banks’s Opening Br. at
    22–23. Defendants then make vague and conclusory assertions regarding
    “problem[s] with accurate memories” and their view that “cross-examination was
    hampered” because “Government witnesses [were] motivated to provide favorable
    testimony.” 
    Id. at 23.
    Defendants also claim that “[i]dentification and interviews
    of Government witnesses were delayed until the Indictment revealed witnesses
    involved in the case.” 
    Id. It is
    unclear how some of these allegations are even
    related to the delay in trial. To the extent they are related, however, Defendants
    have failed to make any specific allegations—such as which witnesses were
    affected by the delay and how this resulted in prejudice—that support their
    contentions. Accordingly, this factor weighs in favor of the government. Cf.
    Castro v. Ward, 
    138 F.3d 810
    , 820 (10th Cir. 1998) (“[D]espite [Defendant’s]
    general allegation that the passage of time made it more difficult for him to
    present a defense, he points to no specific prejudice he claims he suffered from
    35
    the delay. He has not claimed that any specific witness or evidence was somehow
    rendered unavailable or less persuasive because of the passage of time.”
    (emphasis added)).
    At best, Defendants have demonstrated only one factor, the first, that
    weighs in favor of finding a violation of their constitutional right to a speedy
    trial. All other factors weigh against them. Accordingly, the balancing of the
    four factors establishes that Defendants’ Sixth Amendment right to a speedy trial
    was not violated.
    B
    We turn now to Defendants’ argument that their Fifth and Sixth
    Amendment rights were violated as a result of the testimony of co-Defendant
    Barnes. Specifically, Defendants argue that they were compelled to call co-
    Defendant Barnes as a witness in violation of their Fifth Amendment privilege
    against self-incrimination and that the district court failed to give a proper
    curative instruction to the jury following Mr. Barnes’s testimony in violation of
    their Sixth Amendment right to a fair trial.
    Whether a defendant’s Fifth Amendment privilege against self-
    incrimination has been violated is a legal question we review de novo. See
    United States v. Rivas-Macias, 
    537 F.3d 1271
    , 1276 (10th Cir. 2008). In
    reviewing jury instructions for legal error, “we view them as a whole to determine
    whether the jury may have been misled, upholding the judgment in the absence of
    36
    substantial doubt that the jury was fairly guided.” United States v. Fabiano, 
    169 F.3d 1299
    , 1303 (10th Cir. 1999) (quoting United States v. Wiktor, 
    146 F.3d 815
    ,
    817 (10th Cir. 1998)) (internal quotation marks omitted). As with its decision
    whether to give a specific instruction at all, see, e.g., United States v. Haslip, 
    160 F.3d 649
    , 654 (10th Cir. 1998) (“We review a district court’s decision whether to
    give a particular jury instruction for abuse of discretion.”); accord Quigley v.
    Rosenthal, 
    327 F.3d 1044
    , 1062 (10th Cir. 2003), ordinarily we review a trial
    court’s decision regarding the timing of when to provide a specific curative
    instruction to the jury for an abuse of discretion, cf. United States v. Moore, 
    376 F.3d 570
    , 577 (6th Cir. 2004) (“A district court has broad discretion to supervise,
    control, and determine the issues the jury is to decide and the manner in which it
    is to do so.”); United States v. Zlatogur, 
    271 F.3d 1025
    , 1030 (11th Cir. 2001)
    (“We review the district court’s failure to provide additional jury instructions for
    abuse of discretion.”). 11
    11
    Defendants argue that the alleged violations of their Fifth and Sixth
    Amendment rights constitute structural errors and, accordingly, are not subject to
    harmless-error analysis. As set forth infra, we ultimately conclude that the district court
    committed no error. However, even if the district court had erred, we would review for
    harmlessness. Harmless-error analysis applies to errors that “occurred during
    presentation of the case to the jury,” and the effect of these errors “may be quantitatively
    assessed in the context of other evidence presented in order to determine whether [they
    were] harmless beyond a reasonable doubt.” United States v. Gonzalez-Lopez, 
    548 U.S. 140
    , 148 (2006) (alteration in original) (quoting Arizona v. Fulminante, 
    499 U.S. 279
    ,
    307–08 (1991)) (internal quotation marks omitted). In contrast, structural errors “defy
    analysis by harmless-error standards because they affec[t] the framework within which
    the trial proceeds, and are not simply an error in the trial process itself.” 
    Id. (alteration in
                                                                                       (continued...)
    37
    However, when a party fails to lodge an objection at trial to purported
    errors—be they instructional or otherwise—ordinarily he cannot “prevail unless
    he could successfully run the gauntlet created by our rigorous plain-error standard
    of review.” United States v. McGehee, 
    672 F.3d 860
    , 876 (10th Cir. 2012); see
    United States v. Rosales-Miranda, --- F.3d ----, 
    2014 WL 3033419
    , at *3 (10th
    Cir. 2014) (“The parties also agree that [the defendant] failed to preserve an
    objection to that error. This forfeiture triggers plain-error review.”); 
    Fabiano, 169 F.3d at 1302
    (“We review a jury instruction . . . for plain error when no
    objection was made.”). It is axiomatic that
    [u]nder this demanding standard, [a litigant] must demonstrate:
    (1) an error, (2) that is plain, which means clear or obvious under
    11
    (...continued)
    original) (quoting 
    Fulminante, 499 U.S. at 309
    –10) (internal quotation marks omitted).
    The Supreme Court has explicitly held that errors relating to the admission of involuntary
    statements are subject to harmless-error analysis. See 
    Fulminante, 499 U.S. at 310
    (“It is
    evident from a comparison of the constitutional violations which we have held subject to
    harmless error, and those which we have held not, that involuntary statements . . . belong
    in the former category.”); 
    id. (“When reviewing
    the erroneous admission of an
    involuntary confession, the appellate court, as it does with the admission of other forms of
    improperly admitted evidence, simply reviews the remainder of the evidence against the
    defendant to determine whether the admission of the confession was harmless beyond a
    reasonable doubt.”). Similarly, in United States v. Lauder, 
    409 F.3d 1254
    (10th Cir.
    2005)—the case Defendants primarily rely on in relation to their Fifth Amendment
    claim—we held that “[c]onstitutional violations such as the one at issue here are subject
    to . . . harmless error analysis . . . under which ‘the beneficiary of a constitutional error
    [must] prove beyond a reasonable doubt that the error complained of [was harmless].’”
    
    Id. at 1261
    (second and third alterations in original) (quoting Chapman v. California, 
    386 U.S. 18
    , 24 (1967)). Accordingly, were we to conclude that the district court had erred
    with regard to the testimony of Mr. Barnes and any subsequent curative instruction
    (insofar as Defendants preserved a challenge to the error), we would review for
    harmlessness.
    38
    current law, and (3) that affects substantial rights. If he satisfies
    these criteria, this Court may exercise discretion to correct the
    error if [4] it seriously affects the fairness, integrity, or public
    reputation of judicial proceedings.
    
    McGehee, 672 F.3d at 876
    (third alteration in original) (quoting United States v.
    Cooper, 
    654 F.3d 1104
    , 1117 (10th Cir. 2011)) (internal quotation marks
    omitted).
    Furthermore, “[a] forfeiture implicating plain error review does not just
    occur when a litigant completely fails to object but also when he or she ‘fail[s] to
    make the timely assertion of a right.’” United States v. Wardell, 
    591 F.3d 1279
    ,
    1309–10 (10th Cir. 2009) (second alteration in original) (quoting United States v.
    Olano, 
    507 U.S. 725
    , 733 (1993)). In other words, a litigant must lodge an
    objection to a purported error while the district court still has an opportunity to
    fix it. See Donley v. Christopher, 
    320 F.2d 24
    , 26 (10th Cir. 1963) (“Having
    failed to object to the records at the time of their production and tender, the
    contention at this belated juncture comes too late.”); accord Macsenti v. Becker,
    
    237 F.3d 1223
    , 1230–31 (10th Cir. 2001) (considering the defendant’s objection
    untimely and applying plain-error review when the defendant “did not object to
    the testimony when it was admitted during trial” but, rather, raised the objection
    “after the close of all the evidence by a motion”); United States v. Walsh, 
    75 F.3d 1
    , 6 (1st Cir. 1996) (“[B]oth objections are subject to review only for plain error.
    It is true that both issues were raised in the trial court after the verdict . . . . But
    39
    the usual rule is that an objection must be made known at the time that the court
    is making its decision to act . . . .”).
    We begin by briefly addressing the factual events leading up to Mr.
    Barnes’s testimony. Then, we turn to Defendants’ argument that Mr. Barnes was
    compelled to take the stand in violation of Defendants’ Fifth Amendment
    privilege. Finally, we examine Defendants’ argument that the district court failed
    to provide adequate curative instructions to the jury in violation of their Sixth
    Amendment right to a fair trial. Ultimately, we conclude that all of Defendants’
    arguments are unpersuasive.
    1
    On October 5, 2011, the government informed Defendants that it was
    ahead of schedule and would be resting its case on October 6, 2011. The district
    court informed Defendants at this time that they needed to have their witnesses
    ready and available to testify. See R., Vol. 2, at 2203–07. On October 7, 2011,
    the district court again admonished Defendants that they needed to have their
    witnesses available and ready to testify. See 
    id. at 2473.
    Yet, on October 11,
    2011, Defendants were still not prepared to present their defense, and they
    informed the district court during a sidebar that they were expecting to run out of
    witnesses for the day. The court informed Defendants that this was
    “unacceptable” and instructed them to call their next witness. Supp. R., Vol. 1, at
    40
    149–50 (Jury Trial Tr., dated Oct. 11, 2011). Then, after conferring among
    themselves, and without interposing any objection, Defendants called co-
    Defendant Barnes to the stand.
    The exchange, as captured by the court reporter, between the district court
    and co-Defendant Walker is as follows:
    The Court: Thank you . . . . Defense may call its next witness.
    Mr. Walker: Your honor, the defense—can we approach?
    The Court: You may.
    (A bench conference [i.e., sidebar] is had, and the following is
    had outside the hearing of the jury.)
    Mr. Walker: Our next witness is scheduled at 10:30. We
    anticipated—it’s going quicker.
    The Court: That is unacceptable. I told you to have witnesses
    here. We are not going to recess again until 10:30. That is 40
    minutes away. I told you to be prepared. They need to be
    here. Your witnesses are not taking long. We are going to go.
    The eight you named, you still have time. So you better get
    them here. So call your next witness.
    Mr. Walker: Yes, Your Honor.
    (The following is had in the hearing of the jury.)
    Mr. Walker: Your Honor, we would like to check to see if Mr.
    Reese is in the witness room.
    41
    The Court: You may.
    Mr. Walker: Your Honor, defense calls Ken Barnes.
    
    Id. at 149–50
    (capitalization altered).
    As the transcript reflects, the district court expressed its dissatisfaction in a
    bench conference (i.e., sidebar) with Defendants’ failure to have their witnesses
    lined up to testify. However, the court “has acknowledged that a portion of the
    sidebar was not transcribed.” 
    Id. at 431
    (Order Rejecting Proposed Stip., filed
    Oct. 16, 2012); see R., Vol. 1, at 1591 (noting that a “portion of the sidebar was
    not transcribed by the court reporter”). As the court has put it, “[f]or whatever
    reason, whether the parties spoke too far from the microphone or the court
    reporter took off her headphones, the court reporter did not hear everything that
    was said at the sidebar and therefore did not transcribe anything besides what is
    contained in the edited transcript.” 12 Supp. R., Vol. 1, at 430.
    12
    Defendants have repeatedly suggested that there is more to it than an
    inadvertent failure to transcribe a portion of the transcript. More specifically, they have
    asserted that the transcript that they received was incomplete; that the “missing transcript”
    holds the key to resolving the disagreement about what the district court said during the
    sidebar, Aplts.’ Principal Br. at 49; and that the absence of the transcript “continues to
    compound the error, and must be resolved for truth to be found,” 
    id. at 52.
    The district
    court was perplexed by Defendants’ repeated intimations to this effect, expressly noting
    that Defendants had received not only the final version of the transcript, but also the court
    reporter’s underlying documentation, which would have permitted Defendants to discern
    whether a portion of the sidebar was omitted from the final version. In this regard, the
    district court stated the following:
    (continued...)
    42
    12
    (...continued)
    The Court is utterly confounded by the fact that Defendants continue
    to request an “unedited” transcript. Defendants were provided with an
    unedited transcript on Day 11 of trial[, i.e., the day of the sidebar at
    issue]. In addition, Defendants also have been provided with the edited
    transcript and access to the court reporter’s original, unedited notes.
    R., Vol. 1, at 1591 n.10; see Supp. R., Vol. 1, at 430 n.2 (noting that “[m]ultiple times, the
    Court has explained to Defendants that they have been provided with everything in the
    Court’s possession”). Seemingly attempting to disabuse Defendants of the notion that
    there was some nefarious conduct responsible for the purported loss of a portion of the
    transcript relating to the sidebar, the court stressed more than once that, unfortunately,
    “the fact of the matter is that this portion of the sidebar conversation was not transcribed.”
    Supp. R., Vol. 1, at 430 n.2; accord R., Vol. 1, at 1591 n.10 (“The fact of the matter is
    that the sidebar conversation was not transcribed and, thus, no transcript will reflect
    precisely what was said.”). In the context of this litigation, Defendants have not given us
    any ground to conclude that the district court’s finding regarding this matter was clearly
    erroneous. Indeed, by way of a Fed. R. App. P. 28(j) letter dated May 21, 2014, the
    government brought to our attention a significant development in separate civil litigation
    spawned by this disagreement over what the district court said during the sidebar that
    fortifies the accuracy of the court’s finding. Specifically, A Just Cause, a nonprofit
    organization, brought suit in the United States District of Colorado against the court
    reporter who transcribed the trial proceedings in this case alleging, inter alia, a breach of
    contract. “The gist of the original Complaint was that the plaintiff had paid [the court
    reporter] $9,450 for a transcript of the trial, but [the court reporter] had not produced a
    complete transcript.” A Just Cause v. United States, Dist. Ct. No. 1:13-cv-02260-RBJ,
    Doc. 39, at 9 (Order, filed May 9, 2014) (citation omitted) (footnote omitted). In the
    operative amended complaint, A Just Cause sued the United States and the court reporter;
    its “three remaining claims [were] for breach of contract, constitutional violation . . . , and
    negligence.” 
    Id. at 11.
    Ultimately, the district court dismissed all three claims in one
    order.
    In the course of drafting that order, however, the court, extraordinarily (as well as
    commendably), “decided to investigate further, . . . by taking judicial notice of the records
    of the court,” the question of the purportedly missing portion of the transcript. 
    Id. The court
    noted that by carefully examining the court’s records, including the court reporter’s
    “unedited draft” of the final transcript, “it could . . . be determined definitively in the
    Banks case[, i.e., the instant case,] whether the court reporter altered something between
    when it was initially recorded and when it became final.” 
    Id. The court
    found no
    (continued...)
    43
    Defendants and the court disagree on what was said in the untranscribed
    portion of the sidebar. Their disagreement persisted “[d]uring trial and in various
    post-trial motions.” 
    Id. Defendants contend
    that the court said words to this
    effect: “Put one of your witnesses on or one of the defendants will have to
    testify.” 
    Id. at 390
    (Proposed Stip., filed Aug. 30, 2012) (internal quotation
    marks omitted). On the other hand, the court recalls saying, “[I]f you intended to
    testify, then one of you should take the stand, because we weren’t going to
    continue.” 
    Id. at 430
    (internal quotation marks omitted). It is undisputed,
    however, that at the time of the sidebar there was in fact a defense witness present
    in the courtroom under subpoena—specifically, FBI Special Agent John
    Smith—who was available to testify, see R., Vol. 1, at 1591–92; indeed,
    Defendants called Agent Smith to testify two days later.
    12
    (...continued)
    evidence of such alteration; it noted that, indeed, A Just Cause did not aver that the court
    reporter “intentionally failed to record something that she heard” or “deleted anything
    from what she recorded.” 
    Id. at 12.
    Notably, the court concluded its findings on this
    matter by unequivocally stating that “there is no substantive difference between the
    unedited transcript and the final, official version . . . therefore, no ‘missing transcript,’
    and nothing relevant to what occurred during the bench conference has been destroyed.”
    
    Id. As with
    the district court’s findings in the instant case regarding the purported
    missing transcript, Defendants offer us no reason to question that the district court’s
    findings in the civil suit brought by A Just Cause are not clearly erroneous. Therefore,
    Defendants’ argument that the purported missing transcript “continues to compound the
    error,” Aplts.’ Principal Br. at 52, in this case is wholly without merit; there is no reason
    to believe there is any such transcript. In any event, on appeal, Defendants cannot
    possibly sustain a tenable claim of prejudice, because we assume arguendo that their
    recollection of the district court’s sidebar comments is correct. Even doing so, we
    conclude infra that they cannot prevail.
    44
    After Mr. Barnes took the stand, he was examined by co-Defendants
    Walker, Banks, and Harper. At no time did Mr. Barnes invoke his Fifth
    Amendment privilege against self-incrimination. Nor, during the course of his
    direct examination, did any Defendant object to the fact that Mr. Barnes was
    offering testimony or to the substance of that testimony. Indeed, the district court
    found that Mr. Barnes’s direct testimony was “favorable” to Defendants. Supp.
    R., Vol. 1, at 238. However, shortly after the government began its cross-
    examination, co-Defendant Walker—who had originally called Mr. Barnes to the
    stand—moved for a mistrial, claiming that he was asserting Mr. Barnes’s Fifth
    Amendment privilege against self-incrimination. The other Defendants did not
    object to Mr. Walker’s invocation of Mr. Barnes’s Fifth Amendment privilege or
    otherwise express concerns about it.
    Following Mr. Walker’s motion for a mistrial, the government requested
    that the court inform the jury that one defendant may not assert the Fifth
    Amendment privilege on behalf of another defendant and, therefore, that the jury
    should disregard Mr. Walker’s statements. The district court stated that it would
    defer giving an instruction until it had ruled on the matter. The jury was then sent
    on a lunch recess while the district court considered the matter.
    After considering the matter, and still outside the presence of the jury, the
    district court advised the parties that the Fifth Amendment privilege “is an
    individual one which can only be exercised by the defendant, himself.” 
    Id. at 45
    228. 13 The court then asked Mr. Barnes if he wanted to assert the privilege, and
    Mr. Barnes stated that he did. The government then suggested that “the Court
    could instruct the jury that all of Mr. Barnes’ testimony, both on direct and on
    cross, should be stricken; that the jury should not consider it, [and] they should
    put it out of their mind[].” 
    Id. at 231.
    The government also suggested that the
    court provide a second curative instruction to address Mr. Walker’s misguided
    attempt to invoke Mr. Barnes’s Fifth Amendment privilege. See 
    id. at 231–32
    (indicating that government counsel proposed “a very brief additional limiting
    instruction” that it considered “appropriate given Mr. Walker’s inappropriate
    objection made in the presence of the jury prior to trial”).
    At this time, both Mr. Walker and Mr. Barnes began arguing to the court
    that Mr. Barnes had been forced to testify against his will and that this had caused
    “extreme prejudice” to all Defendants. 14 
    Id. at 233
    (Statement of Gary Walker);
    13
    See In re Grand Jury Subpoenas, 
    144 F.3d 653
    , 663 (10th Cir. 1998)
    (“There is no constitutional right not to be incriminated by the testimony of another . . . .
    The privilege against self-incrimination is solely for the benefit of the witness and is
    purely a personal privilege of the witness, not for the protection of other parties.” (quoting
    United States v. Skolek, 
    474 F.2d 582
    , 584 (10th Cir. 1973)) (internal quotation marks
    omitted)); see also Heinold Hog Market, Inc. v. McCoy, 
    700 F.2d 611
    , 613 (10th Cir.
    1983) (“The privilege against compulsory self-incrimination is limited to its historic
    function of protecting only the natural individual from compulsory incrimination through
    his own testimony or personal records.” (quoting United States v. White, 
    322 U.S. 694
    ,
    701 (1944)) (internal quotation marks omitted)).
    14
    Mr. Walker also continued to argue that his co-defendants’ individual rights
    had been violated despite being informed repeatedly by the district court that he could not
    invoke the Fifth Amendment privilege on behalf of another. See, e.g., Supp. R., Vol. 1, at
    (continued...)
    46
    see 
    id. (Statement of
    Kendrick Barnes) (“I was compelled to take the stand from
    our discussion up at the bench, as we approached the bench.”); see also 
    id. at 232
    (“The only reason I took the stand, Your Honor, was I was basically—when we
    approached, we were told [by the court] that someone needed to from us if we
    can’t get our witnesses to testify, and that is the reason why I took the stand. It is
    on the premise that I had to. If we don’t have a witness, one of us is going to
    have to take the stand. So I took the stand.”). The district court repeatedly
    rejected these arguments and noted: “[Mr. Barnes] wasn’t compelled. He got on
    the stand voluntarily. You asked him questions, he answered questions. This was
    not an issue that was raised until after he had finished giving all of his direct
    testimony.” 15 
    Id. at 234;
    see also 
    id. at 248
    (“All the Court directed was that the
    defendants should call their next witness, at which time defendants called Mr.
    Barnes, and Mr. Barnes voluntarily took the stand.”).
    The district court then offered to strike Mr. Barnes’s testimony and offer
    the curative instruction provided by the government. Mr. Barnes stated that he
    14
    (...continued)
    233–34.
    15
    The district court also repeatedly asked Defendants how they were
    prejudiced by Mr. Barnes’s testimony given that (1) they all decided to call Mr. Barnes to
    the stand; (2) no objections were made until after Defendants had elicited the favorable
    testimony from Mr. Barnes; and (3) the testimony concerned evidence that was already in
    the record. Defendants provided no coherent answers to these questions and simply
    continued to make the conclusory assertion that they were prejudiced because their rights
    were violated. See Supp. R., Vol. 1, at 234–46.
    47
    would finish his cross-examination and did not want a curative instruction
    regarding his testimony. See 
    id. at 253
    (“The Court: You do not want a curative
    instruction? Mr. Barnes: No, I don’t want a curative.” (capitalization altered)).
    The court then informed Mr. Barnes that he could not selectively invoke his Fifth
    Amendment privilege. Rather, because Mr. Barnes chose to testify and proceed
    with cross-examination, he had waived his Fifth Amendment privilege regarding
    any questions within the scope of his direct examination, and the government
    could permissibly “comment on [his] refusal to answer those questions” if he
    invoked his Fifth Amendment privilege on cross-examination. 
    Id. at 255.
    Mr.
    Barnes then requested an additional twenty minutes to think over how he wished
    to proceed, which the court granted.
    When the court reconvened, Mr. Barnes stated that he wanted to continue
    with cross-examination, and again stated that he did not want a curative
    instruction regarding his testimony. Before he testified, however, the court did
    provide the jury with a curative instruction relating to Mr. Walker’s objection,
    along the lines proposed by the government, which stated, “Immediately before
    the break, there was an objection, and I just wish to remind you again that
    statements or objections made by attorneys or the defendants while not testifying
    are not evidence, and they should not be considered by you in any way.” 
    Id. at 258.
    In his subsequent testimony, Mr. Barnes did not offer any substantive
    responses to the government’s questions on cross-examination; instead, as to each
    48
    question, he purported to invoke his Fifth Amendment privilege. See, e.g., 
    id. at 259
    (“I will be asserting my Fifth Amendment privilege under the Constitution.”).
    2
    We first turn to the question of whether the district court compelled Mr.
    Barnes to take the witness stand and testify in violation of his Fifth Amendment
    privilege. 16 Like the district court, for purposes of analyzing this question, we are
    16
    Lest there be any confusion, although all Defendants claim that the district
    court erred and that they all have suffered resulting prejudice, we underscore that only
    Mr. Barnes’s Fifth Amendment rights are at issue here. See, e.g., In re Grand Jury
    
    Subpoenas, 144 F.3d at 663
    . It was only Mr. Barnes who took the stand. Defendants rely
    on United States v. Sarracino, 
    340 F.3d 1148
    (10th Cir. 2003), in an attempt to establish
    that a co-defendant’s testimony can be prejudicial to non-testifying defendants. See
    Banks’s Opening Br. at 30. However, Defendants’ reliance on Sarracino is unavailing.
    At issue in Sarracino was a co-defendant’s Sixth Amendment right to confrontation, not a
    co-defendant’s Fifth Amendment privilege against self-incrimination. 
    See 340 F.3d at 1160
    –61. Specifically, in Sarracino, we were concerned with the rule articulated in
    Bruton v. United States, 
    391 U.S. 123
    (1968), that the admission of a co-defendant’s
    confession inculpating the defendant at a joint trial at which the co-defendant does not
    testify violates the defendant’s Sixth Amendment right to confront witnesses against him.
    See 
    Sarracino, 340 F.3d at 1159
    –61. It is patent from this recitation of its factual context
    that Sarracino is inapposite. Moreover, even in Sarracino, we noted that the Bruton rule
    “applies only in those few contexts where the statement is so inculpatory as to the
    defendant that the practical and human limitations of the jury system cannot be ignored.”
    
    Id. at 1160
    (quoting United States v. Rahseparian, 
    231 F.3d 1267
    , 1277 (10th Cir. 2000))
    (internal quotation marks omitted); see 
    id. (“[T]he Bruton
    rule does not apply to
    ‘statements that are not directly inculpatory but only inferentially incriminating.’”
    (quoting 
    Rahseparian, 231 F.3d at 1277
    )); see also United States v. Shaw, --- F.3d ----,
    
    2014 WL 3377652
    , at *8 (10th Cir. 2014) (noting, inter alia, that a Bruton-type solution,
    such as redaction of a transcript, “is just a tool to remove, in appropriate cases, the
    prejudice to the defendant from allowing the jury to hear evidence admissible against the
    codefendant but inadmissible against the defendant” (emphasis added)). Given this
    understanding of the Bruton rule, even if the rule did apply here—which it does
    not—Defendants’ argument would still fail because apparently nothing in Mr. Barnes’s
    testimony was incriminating. As the district court stated, “It was not until Defendants had
    (continued...)
    49
    prepared to “[assume] arguendo that Defendants’ version of what was said at the
    sidebar conference is correct.” R., Vol. 1, at 1591. However, even doing so, we
    join the district court in concluding that “Defendant Barnes was still not
    compelled to take the stand.” 
    Id. Accordingly, Mr.
    Barnes was not compelled to
    violate his Fifth Amendment rights.
    Arguably, Defendants have forfeited any purported Fifth Amendment
    objection to Mr. Barnes’s decision to testify and to his testimony during direct
    examination. Neither Mr. Barnes nor any of the other Defendants raised any
    objections regarding these matters; in particular, none of them even intimated that
    Mr. Barnes was being compelled to testify by the district court. 17 To be sure,
    when cross-examination commenced, they raised their compulsion-related
    objection. But, like the district court, we are hard-pressed to find that this
    16
    (...continued)
    elicited as much favorable evidence as possible from Defendant Barnes that they raised
    any objection to his testifying.” R., Vol. 1, at 1592. Defendants have not meaningfully
    contradicted—either before the district court or on appeal—the district court’s finding
    that Mr. Barnes’s testimony was favorable to the defense. Furthermore, the fact that the
    government advocated for completely striking Mr. Barnes’s direct-examination testimony
    to address his post-direct-examination assertion of his Fifth Amendment privilege lends
    support to the view that there was nothing incriminating in this testimony. See Supp. R.,
    Vol. 1, at 249 (“[W]hat the Government proposes in order to deal with that issue is to ask
    the Court to instruct the jury that the testimony of Mr. Barnes is being stricken in its
    entirety, and that they should not consider it as evidence in this trial in any way.”).
    17
    The record reflects that the district court explicitly asked Mr. Banks, “Why
    did you not make an objection on that basis[, i.e., compulsion of Mr. Barnes to testify,]
    for the record?” Supp. R., Vol. 1, at 237. Mr. Banks’s response—“[h]onestly, because
    we didn’t feel it would do any good,” 
    id. at 238—hardly
    signals that he was in fact
    lodging a compulsion-related argument.
    50
    objection was anything but untimely with respect to Mr. Barnes’s decision to
    testify and the direct-examination testimony that preceded the objection.
    Therefore, a cogent case could be made for the application of plain-error review
    to this objection. See, e.g., 
    Wardell, 591 F.3d at 1309
    –10; 
    Donley, 320 F.2d at 26
    . However, because the government does not press for the application of the
    plain-error standard to this objection, see 
    McGehee, 672 F.3d at 873
    n.5 (“[A]
    colorable argument could be advanced that we should overlook [Defendant’s]
    apparent failure to preserve his acceptance-of-responsibility argument because the
    government forfeited the right to object to it.”), and because we conclude, even
    under the more searching de novo standard, see 
    Rivas-Macias, 537 F.3d at 1276
    ,
    that the district court did not compel Mr. Barnes to testify—and consequently did
    not commit the error of contravening Mr. Barnes’s Fifth Amendment right not to
    testify—we need not definitively decide whether the plain-error standard should
    apply here.
    Taking up our task, at the outset, we recall that under Defendants’ view of
    the district court’s sidebar comments, the court gave Defendants two alternative
    options for addressing the court’s concerns about their timely presentation of
    witnesses. Specifically, according to Defendants, the court stated: “Put one of
    your witnesses on or one of the defendants will have to testify.” Supp. R., Vol. 1,
    at 390 (internal quotation marks omitted). Notably, only one of the two options
    involved a Defendant, like Mr. Barnes, taking the witness stand. In other words,
    51
    Defendants could have fully complied with the district court’s purported directive
    by offering for testimony a non-Defendant witness. It follows ineluctably that if
    Defendants had such a non-Defendant witness present and available to
    testify—such that they could have followed the district court’s purported mandate
    by offering that witness—and if they elected instead to have one of their number
    take the witness stand, then that election by Defendants would have been
    voluntary. And that is precisely the situation here, as the district court succinctly
    described it:
    Left unmentioned by Defendants in their motions is the fact that
    FBI Special Agent John Smith was present in court and available
    to testify at all relevant times. Defendants had previously
    indicated that they would call Agent Smith to the stand, and they
    did so on Day 13 of trial. Defendants cannot argue in good faith
    that Defendant Barnes was compelled to take the stand when they
    could have called Agent Smith.
    R., Vol. 1, at 1591–92.
    In other words, because Defendants could have complied with the district
    court’s purported directive by putting Agent Smith on the witness stand, then
    their decision instead to call co-Defendant Barnes cannot reasonably be viewed as
    a compelled response to the court’s directive. To be sure, before the district
    court, “Defendants attempt[ed] to minimize the importance of Agent Smith’s
    availability because they purportedly did not intend to call him at that point in
    trial,” 
    id. at 1592,
    telling the court that they were not prepared to present him “in
    a manner that would be advantageous” to them, Supp. R., Vol. 1, at 245. The
    52
    court, however, rejected Defendants’ contentions in this regard.
    The court immediately recognized that the tacit message of Defendants’
    arguments was that they had a choice to call Agent Smith or to call one of the
    Defendants (e.g., Mr. Barnes) to the stand, and they voluntarily—presumably for
    strategic reasons—chose the latter option. 
    Id. (reflecting that
    the court responded
    to Defendants’ argument that they were not prepared to call Agent Smith on Day
    11 by stating, “So you made the decision who to call.”). Furthermore, the court
    stressed its “considerable discretion in controlling the orderly presentation of
    evidence . . . in order to promote the efficient administration of the judicial
    process.” R., Vol. 1, at 1592 (citing Thweatt v. Ontko, 
    814 F.2d 1466
    , 1470 (10th
    Cir. 1987)). And it concluded that, “[g]iven Defendants’ flouting of the Court’s
    multiple directives to secure the presence of witnesses, the Court was well within
    its discretion in ordering Defendants to call a witness, rather than to take yet
    another recess.” 
    Id. Defendants may
    well have abandoned on appeal their efforts to minimize
    the detrimental impact of Agent Smith’s trial presence on their compulsion
    argument. They certainly do not reiterate their trial argument here in full form.
    At best, they insist that “it is not the role of the Government or the Court to
    dictate the manner in which a defendant should present his or her case-in-chief.”
    Aplts.’ Principal Br. at 49. However, even if Defendants have not abandoned the
    argument, we fully agree with the district court’s explanation of why it lacks
    53
    merit. And, in particular, we reject Defendants’ suggestion that the district court
    sought to “dictate” the manner in which they put on their case-in-chief; rather, the
    court simply exercised its considerable discretion to ensure that the jury’s time
    was not wasted and that evidence was presented at trial efficiently, by ostensibly
    mandating that Defendants call a witness to the stand—not necessarily one of
    them. See Fed. R. Evid. 611(a)(2) (noting that “[t]he court should exercise
    reasonable control over the mode and order of examining witnesses and
    presenting evidence so as to . . . avoid wasting time”); 
    Thweatt, 814 F.2d at 1470
    (“A trial court necessarily possesses considerable discretion in determining the
    conduct of a trial, including the orderly presentation of evidence.”); accord Green
    Constr. Co. v. Kan. Power & Light Co., 
    1 F.3d 1005
    , 1013 (10th Cir. 1993); see
    also United States v. Janati, 
    374 F.3d 263
    , 273 (4th Cir. 2004) (“The scope of the
    district court’s discretion to manage trials before it is and must be particularly
    broad. Accordingly, we have held, among other things, that district courts have
    wide-ranging control over management of their dockets, the courtroom
    procedures, and the admission of evidence.”).
    In sum, based on the foregoing, we conclude that Mr. Barnes was not
    compelled to take the witness stand and testify by the district court’s purported
    sidebar comments. In other words, he testified voluntarily.
    3
    Because Mr. Barnes testified voluntarily, Defendants’ Fifth Amendment
    54
    arguments are untenable. As the district court properly observed, by voluntarily
    testifying on direct examination, Mr. Barnes waived his right to invoke the Fifth
    Amendment on cross-examination. See United States v. Constantine, 
    263 F.3d 1122
    , 1128 n.4 (10th Cir. 2001) (“It is well established that a witness . . . may not
    testify voluntarily about a subject and then invoke the privilege against self-
    incrimination when questioned about the details.” (quoting Mitchell v. United
    States, 
    526 U.S. 314
    , 321 (1999)) (internal quotation marks omitted)); United
    States v. Crockett, 
    435 F.3d 1305
    , 1313 (10th Cir. 2006) (“When an accused
    testifies in his own case-in-chief, he waives his privilege against self-
    incrimination, a waiver that subjects him to cross-examination on all relevant
    facts.” (internal quotation marks omitted)). As the Supreme Court has explained,
    witnesses “may not pick and choose what aspects of a particular subject to discuss
    without casting doubt on the trustworthiness of the statements and diminishing the
    integrity of the factual inquiry.” 
    Mitchell, 526 U.S. at 322
    ; see also 
    id. (“The illogic
    of allowing a witness to offer only self-selected testimony should be
    obvious even to the witness.”).
    Defendants point to our holding in United States v. Lauder, 
    409 F.3d 1254
    ,
    1261 (10th Cir. 2005)—in which we used a five-factor test to determine whether a
    constitutional error occurs when a defendant chooses to invoke his or her Fifth
    Amendment right—and argue that the same five-factor test should be used here.
    In Lauder, we applied harmless-error analysis in reviewing the government’s
    55
    comments regarding a defendant’s silence and concluded that the resulting error
    was harmless beyond a reasonable doubt. See 
    id. at 1261–62.
    In particular, we
    held that in determining whether comments regarding a defendant’s silence were
    harmless, the court considers:
    (1) the use to which the prosecution puts the silence, (2) who
    elected to pursue the line of questioning, (3) the quantum of other
    evidence indicative of guilt, (4) the intensity and frequency of the
    reference, and (5) the availability to the trial judge of an
    opportunity to grant a motion for mistrial or to give curative
    instructions.
    
    Id. at 1261
    .
    However, our holding in Lauder is inapposite. Specifically, in contrast to
    the situation presented here, the defendant in Lauder invoked his right to remain
    silent before trial. See 
    id. at 1260.
    Then, during trial, a government agent
    impermissibly referenced the defendant’s decision to remain silent. See 
    id. at 1260–61.
    Here, Mr. Barnes voluntarily chose to take the stand, thereby waiving
    his Fifth Amendment privilege. Thus, no error occurred in this case and,
    consequently, Lauder’s harmless-error analysis has no purchase here. 18
    18
    Therefore, it cannot be gainsaid that, notwithstanding Defendants’
    assertions to the contrary, the government did not “bec[o]me the benefactor of the abuse
    of the [Fifth Amendment] privilege.” Banks’s Opening Br. at 31. Indeed, once the
    privilege has been waived, the government is within its rights to comment on a
    defendant’s subsequent refusal to answer questions that are within the scope of the
    questions voluntarily given on direct examination. See United States v. Hanrahan, 
    508 F.3d 962
    , 967 (10th Cir. 2007) (holding that if a defendant chooses not to testify, the Fifth
    Amendment prohibits the government from commenting on that decision, but “[a]
    defendant who chooses to testify waives his privilege against compulsory self-
    (continued...)
    56
    Defendants also argue that the district court applied the law inconsistently,
    and that this warrants reversal. See Banks’s Opening Br. at 29–31. However,
    Defendants never clearly set forth what law is at issue—though one assumes they
    are referring to the general precepts of the Fifth Amendment—or how that law
    was applied inconsistently. See 
    id. They appear
    to be asserting that the district
    court applied the law inconsistently because it first held that Mr. Barnes waived
    his Fifth Amendment privilege by taking the stand and testifying but then
    “changed its position and erred in permitting Barnes to retake the stand and
    repeatedly invoke the Fifth in response to the Government’s further cross-
    examination.” 
    Id. at 28.
    This argument is without merit. The district court did not inconsistently
    apply the law. Rather, it properly instructed Mr. Barnes that he could either have
    his entire testimony stricken (and a curative instruction given), or he could
    18
    (...continued)
    incrimination with respect to the testimony he gives” (alteration in original) (quoting
    Harrison v. United States, 
    392 U.S. 219
    , 222 (1968)) (internal quotation marks omitted)).
    However, the government did not do this here. Specifically, the government did not
    comment on Mr. Barnes’s invocation of his Fifth Amendment privilege during closing
    arguments and did not request that the jury be instructed that it could draw negative
    inferences from Mr. Barnes’s belated invocation of his Fifth Amendment privilege.
    Rather, the only instruction given to the jury on this issue was as follows: “You should
    weigh Defendant Barnes’ testimony and evaluate his credibility in the same way as that of
    any other witness. You may consider his refusal to answer certain questions in assessing
    his credibility.” R., Vol. 1, at 825 (Final Jury Instrs., filed Oct. 20, 2011). Thus, if
    anything, the government showed restraint in its handling of Mr. Barnes’s refusal to
    answer questions on cross-examination, after having waived his Fifth Amendment
    privilege, and hardly sought to exploit the situation that Defendants themselves created.
    57
    continue to testify but, if he did so, he would be required to answer the
    government’s questions—to the extent they were within the scope of direct—and,
    if he chose not to answer, the government would be within its rights to comment
    on that silence. The district court’s approach involved a proper application of
    Fifth Amendment principles to the instant facts. And it involved no
    inconsistency. It was Mr. Barnes who chose to continue testifying, even after the
    district court admonished him that he would be legally obliged to answer the
    government’s questions. And it was Mr. Barnes who elected to invoke the Fifth
    Amendment and remain silent when ultimately confronted with the government’s
    questions, though fully aware, based on the court’s warnings, that he had waived
    his Fifth Amendment privilege. In short, the district court did not apply the law
    inconsistently, and there is no ground for reversal on that score.
    4
    Finally, Defendants allege that the curative instructions given by the
    district court were insufficient and that this violated their Sixth Amendment right
    to a fair trial. The district court considered two separate curative instructions.
    The first concerned Mr. Barnes’s testimony on direct examination and his
    decision to invoke his Fifth Amendment privilege during cross-examination. This
    instruction would have informed the jury that Mr. Barnes’s testimony during
    direct examination was being stricken and was not to be considered by the jury.
    The second proposed curative instruction concerned Mr. Walker’s attempt to
    58
    invoke Mr. Barnes’s Fifth Amendment rights and his motion for a mistrial.
    The district court repeatedly offered to give the first curative instruction;
    however, Mr. Barnes twice refused the instruction and chose instead to continue
    his testimony on cross-examination. Defendants now argue that the failure to
    give the first instruction was error. This argument is without merit. Because
    Defendants explicitly and intentionally instructed the court not to give the
    instruction, any error was invited, and they have waived their right to challenge
    this issue on appeal. See United States v. Cornelius, 
    696 F.3d 1307
    , 1319 (10th
    Cir. 2012) (noting in the context of a jury instruction that “[a] waived claim or
    defense is one that a party has knowingly and intelligently relinquished” (quoting
    Wood v. Milyard, --- U.S. ----, 
    132 S. Ct. 1826
    , 1832 n.4 (2012)) (internal
    quotation marks omitted)); see also 
    id. (noting that
    “a party that has waived a
    right is not entitled to appellate relief” (quoting United States v. Cruz-Rodriguez,
    
    570 F.3d 1179
    , 1183 (10th Cir. 2009)) (internal quotation marks omitted)).
    As for the second curative instruction relating to Mr. Walker’s purported
    invocation of Mr. Barnes’s Fifth Amendment rights, Defendants allege that the
    instruction was “cursory and wholly insufficient,” Aplts.’ Principal Br. at 47, and,
    by not instructing the jury immediately—that is, by delaying issuance of the
    curative instruction until after the jury took a lunch recess—the court
    “disregard[ed] its duty to minimize the obvious prejudice to the jury, so as to
    maintain as much of its impartiality as possible,” id.; see also 
    id. at 50
    (“[T]he
    59
    Court declined to instruct the jury within the immediate aftermath of the injurious
    episode [of Mr. Walker’s Fifth Amendment objection], other than directing the
    panel to take lunch recess. This is wholly insufficient.” (citation omitted)).
    However, Defendants’ challenge based on these allegations is presented for the
    first time on appeal; in other words, Defendants lodged no contemporaneous
    objections relating to either the substance or the timing of the Walker-related
    curative instruction.
    Accordingly, we review this challenge only for plain error. See, e.g.,
    
    Fabiano, 169 F.3d at 1302
    . Contrary to Defendants’ suggestion, it is only in the
    face of clear or obvious error that would work a manifest injustice—which is the
    kind of error addressed by the plain-error standard, see, e.g., Richison v. Ernest
    Grp., Inc., 
    634 F.3d 1123
    , 1128 (10th Cir. 2011) (“[W]e will entertain forfeited
    theories on appeal, but we will reverse a district court’s judgment on the basis of
    a forfeited theory only if failing to do so would entrench a plainly erroneous
    result.”); 
    id. at 1129
    (discussing “applying the plain error/manifest injustice
    standard to newly raised legal theories”)—that the court has a duty to take
    corrective action “regardless of whether it was affirmatively requested . . . by any
    party,” Aplts.’ Principal Br. at 50–51.
    We conclude that Defendants cannot even establish the first prong of the
    plain-error standard—viz., they cannot establish that the district court erred at all.
    Here, the court’s instruction was straightforward and provided a correct statement
    60
    of the law: it properly instructed the jury that statements or objections made by a
    defendant while not testifying (i.e., Mr. Walker) were not evidence. Defendants
    have offered us no legal authority to substantiate their conclusory assertion that
    this instruction was (as a matter of law) “wholly insufficient,” Aplts.’ Principal
    Br. at 47, and we conclude that the jury was not misled regarding the governing
    law. Nor have Defendants directed us to anything in the record to bolster their
    equally conclusory—as well as speculative—suggestion that the court’s brief
    delay in providing the instruction (i.e., until after the lunch break) constituted an
    abuse of discretion and prejudiced them because it gave the jury “ample time to
    refine [its] deleterious interpretations,” 
    id. at 50
    , of Mr. Walker’s objection.
    Jurors are presumed to follow a trial court’s instructions. See, e.g., United States
    v. Chanthadara, 
    230 F.3d 1237
    , 1251 (10th Cir. 2000) (“Generally, we assume
    that jurors follow the judge’s instructions.”). And we have no reason to believe
    that the relatively brief lunch recess would have led these jurors to disregard the
    court’s curative instruction regarding Mr. Walker’s objection and to instead act
    on any contrary impressions (deleterious or otherwise) that they had formed of his
    objection. Accordingly, like the legal substance of the jury instruction, we
    discern no error in the timing of the district court’s delivery of the instruction. In
    other words, the district court did not commit error, much less clear or obvious
    (i.e., plain) error.
    61
    C
    We turn now to Defendants’ claim that the district court abused its
    discretion in excluding two of Defendants’ proposed witnesses, Andrew Albarelle
    and Kellie Baucom. We review the district court’s decision to exclude both
    expert and lay witness testimony as a sanction for violation of Federal Rule of
    Criminal Procedure 16 for abuse of discretion. See United States v. Wicker, 
    848 F.2d 1059
    , 1060–61 (10th Cir. 1988). “We review de novo whether the district
    court employed the proper legal standard and performed its gatekeeper role in
    determining whether to admit or exclude expert testimony,” and “[w]e review for
    abuse of discretion the manner in which the district court performs this
    gatekeeping role.” United States v. Nacchio, 
    555 F.3d 1234
    , 1241 (10th Cir.
    2009) (en banc) (internal quotation marks omitted). Assuming that the district
    court performs this role, “[our] review is deferential: we will not disturb the
    ruling unless it is arbitrary, capricious, whimsical or manifestly unreasonable, or
    we are convinced that the district court made a clear error of judgment or
    exceeded the bounds of permissible choice in the circumstances.” 
    Id. (internal quotation
    marks omitted).
    Defendants argue that Mr. Albarelle and Ms. Baucom should have been
    permitted to testify as expert witnesses, or alternatively, that the witnesses should
    have been permitted to testify as fact witnesses. The district court disallowed the
    testimony of both witnesses on the grounds that Defendants failed to disclose the
    62
    witnesses in accordance with Federal Rule of Criminal Procedure 16 and Federal
    Rule of Evidence 702. Although Defendants concede that they failed to comply
    with the disclosure requirements of Rules 16 and 702, they nevertheless argue
    that “the record reflects that their efforts were made in good faith, and the Court’s
    chosen remedy of exclusion was in contravention to established precedent.”
    Aplts.’ Principal Br. at 56.
    We begin by addressing the events leading up to the exclusion of
    Defendants’ witnesses. We then address the district court’s decision to exclude
    Defendants’ witnesses as a sanction for failing to comply with Federal Rule of
    Criminal Procedure 16’s disclosure requirements and also with Federal Rule of
    Evidence 702. We then turn to Defendants’ alternative argument that Mr.
    Albarelle and Ms. Baucom should have been allowed to testify as fact witnesses.
    Finally, we address Defendants’ argument that their Sixth Amendment rights were
    violated by the district court’s exclusion of the witness testimony.
    1
    On October 8, 2010, Defendants filed an expert disclosure in accordance
    with the requirements of Federal Rule of Criminal Procedure 16. The disclosure
    contained a summary of the opinions to be offered by Donald Vilfer, but included
    no other proposed expert witnesses. During a pretrial conference regarding the
    admissibility of Mr. Vilfer’s testimony, Defendants again failed to provide
    disclosures regarding any other potential expert witnesses. During opening
    63
    statements to the jury, Defendants made references to the fact that they would be
    calling expert witnesses to testify regarding business practices in the staffing
    industry. The government then informed the district court that it had not received
    disclosures of expert testimony relating to these topics and noted that it would
    object to the introduction of such testimony. At the close of its case-in-chief, the
    government again put Defendants and the court on notice that it would object to
    any expert testimony that had not been disclosed in accordance with Rule 16.
    “[D]efendants failed to respond in any way to the Government’s objection or to
    inform the Court that this was an issue that needed to be addressed before the trial
    began.” R., Vol. 2, at 2342.
    Defendants called Mr. Albarelle as their first witness and stated that they
    were “going to establish [him] as an expert.” 
    Id. at 2288
    (Jury Trial Tr., dated
    Oct. 6, 2011). When the court questioned Defendants regarding whether they had
    made a Rule 16 disclosure or submitted a Rule 702 opinion, Defendants
    responded: “Your Honor, we were informed we could qualify him on the stand.”
    
    Id. However, Defendants
    were “unable or unwilling to disclose the identity of
    this legal advice.” 
    Id. at 2342.
    Defendants then argued that a letter sent by Mr.
    Albarelle to the United States Attorney’s Office satisfied Rule 16’s disclosure
    requirements. 19 The court rejected this argument. Defendants then proposed that
    19
    The contents of the letters written by Mr. Albarelle and Ms. Baucom are
    discussed in greater detail in Part II.C.2, infra.
    64
    Mr. Albarelle and another potential expert witness, Ms. Baucom, could testify as
    lay witnesses. The court rejected this argument as well, noting that the type of
    testimony Defendants wanted to introduce through these individuals constituted
    expert testimony.
    Although the court initially ruled that Defendants could not offer testimony
    from Mr. Albarelle, Ms. Baucom, or a third witness, Joseph Thurman, it later
    revised its ruling to allow testimony from Mr. Thurman. In so ruling, the court
    acknowledged that the “exclusion of evidence for violating discovery orders
    should not be done lightly,” 
    id. at 2341,
    but held that the sanction was warranted
    under these circumstances where Defendants had “not offered any legitimate
    reasons for failing to submit their Rule 16 disclosures as to these two witnesses,”
    
    id. 20 While
    the court held that the testimony of Mr. Albarelle and Ms. Baucom
    was inadmissible, it concluded that the government had received some notice that
    Mr. Thurman would be called 21—though it noted that the disclosure regarding Mr.
    20
    While the court acknowledged that Defendants were proceeding pro se, it
    noted that Defendants had “repeatedly rejected [the] Court’s offer to appoint stand-by
    advisory counsel.” R., Vol. 2, at 2341. Moreover, “[D]efendants were also aware that
    they would be required to follow the same procedural rules that govern other litigants . . .
    [and] knew, or should have known, that they were expected to submit Rule 16
    disclosures.” 
    Id. 21 A
    few months prior to trial, Defendants had submitted to the government a
    stack of materials that included a document prepared by Mr. Thurman entitled “Expert
    Report on Staffing Industry Standards and Best Practices.” R., Vol. 2, at 2344 (internal
    (continued...)
    65
    Thurman was inadequate—and thus allowed Mr. Thurman to provide expert
    testimony regarding the staffing industry. In light of its decision to allow Mr.
    Thurman to testify, the court also noted that any testimony offered by Mr.
    Albarelle and Ms. Baucom would have been cumulative.
    2
    In light of the foregoing facts, we conclude that the district court did not
    abuse its discretion in excluding the testimony of Mr. Albarelle and Ms. Baucom
    due to Defendants’ failure to comply with Rule 16’s disclosure requirements.
    Specifically, Rule 16 of the Federal Rules of Criminal Procedure provides that
    “[t]he defendant must, at the government’s request, give to the government a
    written summary of any testimony that the defendant intends to use under Rule[]
    702 . . . of the Federal Rules of Evidence as evidence at trial.” Fed. R. Crim. P.
    16(b)(1)(C). “If a party fails to comply with this rule, the court may . . . prohibit
    that party from introducing the undisclosed evidence; or . . . enter any other order
    that is just under the circumstances.” 
    Id. §§ 16(d)(2)(C),
    (D).
    In United States v. Wicker, 
    848 F.2d 1059
    (10th Cir. 1988), we set forth
    three factors that the district court should consider in determining the appropriate
    sanction for a Rule 16 violation: (1) the reason for the delay, including whether
    the non-compliant party acted in bad faith; (2) the extent of prejudice to the party
    21
    (...continued)
    quotation marks omitted).
    66
    that sought the disclosure; and (3) “the feasibility of curing the prejudice with a
    continuance.” 
    Id. at 1061.
    We also noted that “these three factors should merely
    guide the district court in its consideration of sanctions; they are not intended to
    dictate the bounds of the court’s discretion.” 
    Id. Thus, for
    example, it may be
    appropriate for a district court “to suppress evidence that did not comply with
    discovery orders to maintain the integrity and schedule of the court even though
    the [party entitled to the disclosure] may not be prejudiced.” 
    Id. Here, the
    Wicker factors all support the district court’s decision to exclude
    Defendants’ witnesses. As the court noted, Defendants offered no legitimate
    reasons for their failure to comply with Rule 16’s disclosure requirements.
    Moreover, the government would have been prejudiced if Defendants had been
    allowed to call expert witnesses on the ninth day of trial—viz., the government
    would have been hobbled in its ability to prepare an effective cross-examination
    challenging the experts’ qualifications and conclusions. See United States v.
    Russell, 
    109 F.3d 1503
    , 1512 (10th Cir. 1997) 22 (White, J., sitting by designation)
    (concluding that there was “no doubt that the prosecution would have been
    prejudiced” had new witnesses been allowed to testify on the same day the
    government received notice of the witnesses, as “the government would need time
    to research the background of the . . . witnesses in order to cross-examine them in
    22
    Although Russell was not a Rule 16 case, we noted in Russell that cases
    involving Rule 16 provide a “satisfactory precedent to deal with violations of orders
    requiring pretrial disclosure of 
    witnesses.” 109 F.3d at 1511
    .
    67
    an effective manner”).
    Finally, with regard to the third Wicker factor, it was not an abuse of
    discretion for the district court to refuse a continuance given that it was the ninth
    day of trial and the government had already rested its case. See 
    Russell, 109 F.3d at 1512
    (finding that the district court did not abuse its discretion in refusing a
    continuance, “even in the absence of bad faith,” where the new witnesses were
    disclosed on the fifth day of trial).
    As we noted in Russell, the “admonition that the trial court must impose the
    least severe sanction that will accomplish . . . prompt and full compliance with
    the court’s discovery orders does not mean that a continuance is necessary just
    because it will cure the prejudice.” 
    Id. (omission in
    original) (citation omitted)
    (quoting 
    Wicker, 848 F.2d at 1060
    ) (internal quotation marks omitted); cf. Taylor
    v. Illinois, 
    484 U.S. 400
    , 413 (1988) (holding that the exclusion of a defense
    witness in a case suggesting bad faith and willfulness on the part of the defense
    did not offend the Sixth Amendment, even when less drastic sanctions were
    available). Accordingly, under the three factors set forth in Wicker, it was not an
    abuse of discretion for the district court to exclude the testimony of Mr. Albarelle
    and Ms. Baucom based on Defendants’ failure to comply with Rule 16’s
    disclosure requirements.
    3
    We further conclude that Defendants failed to establish that Mr. Albarelle’s
    68
    and Ms. Baucom’s proposed testimony was admissible under Federal Rule of
    Evidence 702, and this provides an additional basis for refusing to allow the
    proposed testimony. “Under Rule 702, the district court must satisfy itself that
    the proposed expert testimony is both reliable and relevant, in that it will assist
    the trier of fact, before permitting a jury to assess such testimony.” 
    Nacchio, 555 F.3d at 1241
    (internal quotation marks omitted). Specifically, Rule 702 provides:
    A witness who is qualified as an expert by knowledge, skill,
    experience, training, or education may testify in the form of an
    opinion or otherwise if: (a) the expert’s scientific, technical, or
    other specialized knowledge will help the trier of fact to
    understand the evidence or to determine a fact in issue; (b) the
    testimony is based on sufficient facts or data; (c) the testimony
    is the product of reliable principles and methods; and (d) the
    expert has reliably applied the principles and methods to the facts
    of the case.
    Fed. R. Evid. 702.
    “The proponent of expert testimony bears the burden of showing that its
    proffered expert’s testimony is admissible.” 
    Nacchio, 555 F.3d at 1241
    . Here,
    Defendants failed to establish that the proposed testimony of Mr. Albarelle and
    Ms. Baucom was either reliable or relevant. The only items in the record from
    Defendants for the court to use in conducting its admissibility inquiry were two
    letters—one written by Mr. Albarelle and the other written by Ms. Baucom—that
    were mailed to John Walsh, the United States Attorney for the District of
    Colorado.
    The letters sent by Mr. Albarelle and Ms. Baucom to Mr. Walsh failed to
    69
    set forth any facts or data that would establish the reliability of the proposed
    testimony. 23 Accordingly, the district court properly performed its gatekeeping
    function in concluding that the letters failed to establish that any opinions to be
    offered by the witnesses were “based on facts which [would] satisfy Rule 702’s
    reliability requirements.” 
    Id. (internal quotation
    marks omitted). It therefore
    inexorably follows that it was not an abuse of discretion for the court to rule that
    the testimony should be excluded.
    We also reject Defendants’ alternative argument that Mr. Albarelle and Ms.
    Baucom should have been permitted to testify as fact witnesses. “A district court
    has broad discretion to determine whether a lay witness is qualified under Rule
    701 to testify on a matter of opinion.” United States v. Garcia, 
    994 F.2d 1499
    ,
    1506 (10th Cir. 1993) (internal quotation marks omitted). Rule 701 of the Federal
    Rules of Evidence provides that opinions by lay witnesses must be “(a) rationally
    based on the witness’s perception; (b) helpful to clearly understanding the
    witness’s testimony or to determining a fact in issue; and (c) not based on
    23
    The letters written by Mr. Albarelle and Ms. Baucom can best be
    characterized as letters of support on behalf of Defendants. For example, the letter
    written by Mr. Albarelle set forth Mr. Albarelle’s belief that Defendants had not engaged
    in criminal wrongdoing. See R., Vol. 1, at 1273–74 (Albarelle Letter, dated July 18,
    2011). The letter gave no indication that Mr. Albarelle would be called as a witness by
    Defendants and concluded with a request that “this case be dismissed without prejudice.”
    
    Id. at 1274.
    The letter written by Ms. Baucom similarly gave no indication that Ms.
    Baucom sought to testify, but rather, stated her belief that she “was shocked at the
    allegations” and that she “firmly believe[d] [Defendants] were not trying to pull off a
    scam.” 
    Id. at 1271
    (Baucom Letter, dated July 20, 2010).
    70
    scientific, technical, or other specialized knowledge within the scope of Rule
    702.” Fed. R. Evid. 701.
    Here, Defendants informed the court that the witnesses would “[t]alk about
    the staffing industry . . . how companies engage staffing companies, how staffing
    companies interact with contractors and employees, as well as 1099 contractors
    for staffing companies.” R., Vol. 2, at 2292. The district court properly
    concluded that this would amount to expert testimony. See 
    id. at 2293.
    Specifically, the court’s conclusion was sound because Defendants failed to
    establish that Mr. Albarelle or Ms. Baucom had personal knowledge of the facts
    which formed the basis of their opinions as required by Rules 701 and 602. 24 See
    
    Garcia, 994 F.2d at 1506
    (“[T]he witness must have ‘first hand knowledge’ of the
    events to which he is testifying.” (quoting United States v. Hoffner, 
    777 F.2d 1423
    , 1425 (10th Cir. 1985))). Given the failure of Defendants to establish that
    the witnesses had personal knowledge of Defendants’ businesses or the facts in
    issue, the district court properly concluded that the witnesses could not testify as
    fact witnesses because their testimony was expert in nature.
    4
    Finally, Defendants argue that their Sixth Amendment right to present a
    complete defense was violated because they should have had the opportunity to
    24
    Rule 602 provides that “[a] witness may testify to a matter only if evidence
    is introduced sufficient to support a finding that the witness has personal knowledge of
    the matter.” Fed. R. Evid. 602.
    71
    present “witness testimony that impeaches material Government witness
    testimony.” Banks’s Opening Br. at 43. Accordingly, they argue that Mr.
    Albarelle and Ms. Baucom “should have been allowed to testify how they work
    with start up companies, how they bill, and what is allowable billing in their
    operations.” 
    Id. at 43–44.
    This argument is wholly unpersuasive.
    Specifically, Defendants had a full opportunity to confront and cross-
    examine the government’s witnesses. Moreover, Defendants were given the
    opportunity to present a comprehensive defense. In fact, despite their failure to
    comply with Rule 16’s disclosure requirements, the court allowed Defendants to
    present testimony from Mr. Thurman, who testified concerning the relationship
    between staffing companies and clients, payrolling, and how staffing companies
    are compensated. See R., Vol. 2, at 2618–903. Defendants therefore had an
    ample opportunity to present testimony regarding staffing companies and their
    billing operations, and this “meaningful opportunity to present a complete
    defense” easily satisfies the Sixth Amendment. United States v. DeChristopher,
    
    695 F.3d 1082
    , 1095 (10th Cir. 2012) (internal quotation marks omitted). The
    district court was also within its rights to conclude that any testimony from Mr.
    Albarelle and Ms. Baucom would have been cumulative, not to mention subject to
    exclusion under Rules 16 and 702. See 
    id. at 1096
    (observing a district court’s
    broad discretion in imposing “reasonable limits on cross-examination based on
    concerns about . . . prejudice, confusion of the issues, . . . or interrogation that is
    72
    repetitive” (omissions in original) (quoting Delaware v. Van Arsdall, 
    475 U.S. 673
    , 679 (1986)) (internal quotation marks omitted)).
    Accordingly, Defendants have failed to establish that the district court
    abused its discretion in preventing Mr. Albarelle and Ms. Baucom from testifying
    for the defense.
    D
    Defendants’ final argument is that, taken together, the errors they have
    alleged deprived them of a fair trial and led to their conviction. In analyzing such
    a claim, “we aggregate all the errors that we have found to be harmless and
    determine ‘whether their cumulative effect on the outcome of the trial’ mandates
    reversal.” United States v. Anaya, 
    727 F.3d 1043
    , 1060–61 (10th Cir. 2013)
    (quoting United States v. Rivera, 
    900 F.2d 1462
    , 1470 (10th Cir. 1990) (en
    banc)). Stated otherwise, we ask whether a defendant has demonstrated that
    “multiple non-reversible errors” infected his trial. United States v. Barrett, 
    496 F.3d 1079
    , 1121 (10th Cir. 2007).
    Here, Defendants’ failure to establish any error—harmless or
    otherwise—makes the cumulative-error doctrine unavailable to them. See United
    States v. Lopez-Medina, 
    596 F.3d 716
    , 741 (10th Cir. 2010) (concluding that a
    similarly situated defendant “cannot benefit from the cumulative error doctrine”
    (internal quotation marks omitted)). It is well-settled that a cumulative-error
    inquiry is warranted “only if true errors occurred.” 
    Anaya, 727 F.3d at 1061
    . By
    73
    contrast, “[c]umulative error cannot be predicated on non-errors,” United States v.
    Oldbear, 
    568 F.3d 814
    , 825 (10th Cir. 2009), or on invited error, see Lopez-
    
    Medina, 596 F.3d at 733
    n.10, 741; United States v. Vizinaiz, 
    428 F.3d 1300
    ,
    1310–12 (10th Cir. 2005). We thus reject Defendants’ cumulative-error argument
    because we find no error among the appealed issues and, as a result, have nothing
    to aggregate.
    III
    For the foregoing reasons, we AFFIRM the judgment of the district court. 25
    25
    On February 17, 2014, Defendants filed in this court a motion to strike an
    order entered by the district court which placed certain docket entries under seal.
    Specifically, the motion contended that the district court lacked jurisdiction to enter the
    order because the case was on appeal. Because we affirm in full the judgment of the
    district court, we DENY this motion as moot.
    74