United States v. Michael White ( 2013 )


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  •                               UNPUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 11-5181
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.
    MICHAEL LAWRENCE WHITE, a/k/a Big Boy,
    Defendant - Appellant.
    No. 12-4158
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.
    VICTOR ANDRE THOMAS, a/k/a Flak, a/k/a Flat,
    Defendant - Appellant.
    Appeals from the United States District Court for the District
    of Maryland, at Baltimore. Richard D. Bennett, District Judge.
    (1:10-cr-00491-RDB-12; 1:10-cr-00491-RDB-3)
    Argued:   January 30, 2013                  Decided:   April 3, 2013
    Before MOTZ, KING, and FLOYD, Circuit Judges.
    Affirmed by unpublished per curiam opinion.
    ARGUED: Ruth J. Vernet, RUTH J. VERNET, ESQ., LLC, Rockville,
    Maryland; Gary Proctor, LAW OFFICES OF GARY E. PROCTOR, LLC,
    Baltimore, Maryland, for Appellants.  Christopher John Romano,
    OFFICE OF THE UNITED STATES ATTORNEY, Baltimore, Maryland, for
    Appellee. ON BRIEF: Rod J. Rosenstein, United States Attorney,
    Baltimore, Maryland, for Appellee.
    Unpublished opinions are not binding precedent in this circuit.
    2
    PER CURIAM:
    In       2010,       a       Harford,        Maryland,       drug         trafficking
    investigation yielded the arrests of Appellants Victor Thomas
    and     Michael    White. 1          Thomas       and     White    were       charged    with
    conspiracy to distribute cocaine and cocaine base, in violation
    of 21 U.S.C. § 846, and possession with intent to distribute the
    same,     in   violation       of   21     U.S.C.       § 841(a)(1).          Additionally,
    Thomas     was    charged      with      felony     possession     of     a    firearm,   in
    violation of 18 U.S.C. § 922(g)(1).
    Following        a   four-day        jury    trial,    Thomas     and     White    were
    convicted on both the conspiracy charge and the drug charge; a
    hung jury resulted on Thomas’s gun charge.                        Thomas and White now
    appeal their convictions on multiple grounds.                           Because we find
    their arguments lacking in merit, we affirm.
    I.
    Thomas      and      White     put    forth       several    challenges       to    the
    evidence introduced at trial.                     One of these issues they raised
    below; the others they did not.                    We review each alleged error in
    1
    Twelve other individuals were also apprehended. Eleven of
    them pled guilty. The twelfth, Rochelle Stokes, was tried with
    Thomas and White but was acquitted via a Rule 29 motion for
    judgment of acquittal at the end of the government’s case.
    3
    keeping with the preservation diligence, or lack thereof, that
    Thomas and White exercised.
    A.
    Thomas and White first allege that the district court erred
    in declining to suppress evidence retrieved via wiretap.                       We
    review the factual findings underlying a motion to suppress for
    clear error; the legal conclusions we review de novo.                      United
    States v. Cain, 
    524 F.3d 477
    , 481 (4th Cir. 2008).                       In every
    instance, we view the evidence in the light most favorable to
    the party that prevailed below—in this instance, the government.
    United States v. Jamison, 
    509 F.3d 623
    , 628 (4th Cir. 2007).
    The Harford County Narcotics Task Force (HCNTF) conducted
    the drug investigation leading to the apprehension of Thomas and
    White.   As part of its efforts, the HCNTF obtained authorization
    to wiretap a cell phone number connected to Thomas.                     The HCNTF
    monitored this number from April 26, 2010, to May 5, 2010, and,
    during that time, intercepted nearly two thousand phone calls.
    Thomas   and   White    maintain      that      the    HCNTF’s    interceptions
    violated both federal law and attorney-client privilege.
    Governmental wiretaps must comport with Title III of the
    Omnibus Crime Control and Safe Streets Act (Omnibus Act), 18
    U.S.C.   § 2510-2522,       a     statute      that    attempts    to     balance
    individuals’   right   to       privacy    against    the   beneficial    inroads
    4
    that electronic monitoring can provide in fighting crime, United
    States v. Clerkley, 
    556 F.2d 709
    , 712 (4th Cir. 1977).                         Relevant
    to this case, the Act requires the government to minimize its
    interceptions where possible to avoid monitoring communications
    that are nongermane to a suspected offense.                  18 U.S.C. § 2518(5)
    (“Every order [authorizing a wiretap] . . . shall be executed as
    soon as practicable, [and] shall be conducted in such a way as
    to    minimize    the   interception     of    communications       not    otherwise
    subject to interception under this chapter . . . .”).
    Thomas and White assert that the HCNTF violated the Omnibus
    Act by failing to minimize any of its interceptions on Thomas’s
    phone.    They also aver that because one of the intercepted calls
    was placed to an attorney, the HCNTF violated attorney-client
    privilege.        Notably,     Thomas   did    not   speak   with    the       attorney
    during   the     call   that   Thomas    and    White    reference;       he    left   a
    voicemail message in which he simply inquired about a court date
    for a civil case and asked the attorney to return his call.
    When Thomas asked the attorney to return his call, however, he
    provided a phone number different from the number that the HCNTF
    was monitoring.
    Based on these alleged violations, Thomas and White moved
    pre-trial to suppress all evidence “derived from” the wiretaps.
    The    district    court     denied     the    motion,    concluding       that     the
    wiretap on Thomas’s phone lacked “any minimization issues.”
    5
    1.
    We   think     it     pertinent       to    note    at     the     outset   that    the
    government has not clearly indicated whether the HCNTF indeed
    minimized    any     of    its     interception         on    Thomas’s       phone.       In
    responding     to        pre-trial       motions,        the        government        simply
    maintained    that       given     the   nature     of       the    investigation,       the
    HCNTF’s      interceptions           comported          with        the      minimization
    requirement of the Omnibus Act.                   Furthermore, at the pre-trial
    motions hearing, when the court queried the government, it again
    responded    in     a     manner    that    lacked       any       firm    indication     of
    minimization:
    I’m not in a position to advise the court at this
    point.    I asked the detective were in fact calls
    minimized and his response to me was there may be
    calls where portions of them were minimized. I can’t
    speak with any more specificity than that. There were
    calls I don’t think were minimized in their entirety.
    There may have very well have been calls that were
    minimized in part.
    The government’s brief here is no more enlightening.                             In fact,
    it noticeably lacks any delineation of minimization efforts or
    explicit denial of Thomas and White’s allegation that “out of
    thousands of calls not one was minimized.”
    We are not unaware of the statutory framework that exists
    for addressing alleged violations of the Omnibus Act.                                 See 18
    U.S.C.    § 3504(a)(1)       (providing          that    when      an     aggrieved    party
    alleges that “evidence is inadmissible because it is the primary
    6
    product of an unlawful act [under the Omnibus Act] or because it
    was    obtained     by     the   exploitation           of     an     unlawful       act,   the
    opponent of the claim shall affirm or deny the occurrence of the
    alleged unlawful act”); United States v. Apple, 
    915 F.2d 899
    ,
    905 (4th Cir. 1990) (recognizing that if allegations brought
    under § 3504(a)(1) lack specificity, the government can respond
    with   a    general      denial).      Because          Thomas       and    White    have   not
    contested the adequacy of the government’s response, however, we
    decline to rule on whether such response was sufficient as a
    matter     of    law.     Rather,     we       simply    document          the    government’s
    persistent equivocation on this point and note that it forces us
    to proceed, for the sake of argument only, on the assumption
    that Thomas and White’s allegation of zero minimization is true.
    Even assuming the truth of this allegation, however, we find no
    error in the admission of the wiretap evidence.
    a.
    Assessing        governmental       compliance          with        the    minimization
    mandate     of     the    Omnibus     Act          is   not     a    formulaic        process.
    Reasonableness is the overarching standard, but the facts of
    each     case     heavily    impact        a       determination           of     whether   the
    government’s behavior was in fact “reasonable.”                                  Clerkley, 556
    F.2d   at    716   (“In     testing    compliance             with    [the       minimization]
    requirement, the courts have proceeded on a case-by-case basis,
    7
    invoking    a    standard       of     reasonableness.”).                 We    employ          three
    factors in our evaluation: “(1) the nature and scope of the
    alleged    criminal          enterprise;       (2)    the     government’s         reasonable
    expectation       as     to     the     content        of,        and    parties       to,        the
    conversations; and (3) the degree of judicial supervision while
    the wiretap order is being executed.”                       Id.
    b.
    Here,      we     conclude       that    regardless          of    whether     the         HCNTF
    minimized       any    of     its     interceptions          on     Thomas’s       phone,         it
    complied    with       the    mandate     in    the        Omnibus      Act.       First,         the
    “nature and scope” of Thomas’s and White’s criminal activities
    weighs in favor of unrestricted interceptions.                                 This Court has
    previously recognized that “[w]hen law enforcement officials are
    confronted with large, far-flung and on-going criminal activity
    involving multiple parties, they are afforded greater latitude
    in   conducting        wiretaps.”            Id.;     see     also       United    States          v.
    Quintana,       
    508 F.2d 867
    ,     874        (7th    Cir.        1975)    (“Large          and
    sophisticated         narcotics       conspiracies          may     justify      considerably
    more interception than would a single criminal episode.”).                                       The
    HCNTF     was    investigating          an     elaborate          drug     conspiracy            that
    included    at       least     thirteen      individuals.                Without       a    doubt,
    Thomas’s and White’s conduct was “far-flung,” “on-going,” and
    “involve[ed]      multiple          parties.”         Clerkley,          556    F.2d       at    716.
    8
    Thus, the HCNTF had “greater latitude” in executing its wiretap
    than it might have otherwise had if the investigation involved
    fewer individuals and isolated crime.                           We conclude therefore
    that       a   ten-day    unrestricted        wiretap     on     Thomas’s      phone,   when
    examined in light of the first reasonableness factor, satisfied
    the minimization requirements of the Omnibus Act.                             Clerkley, 556
    F.2d at 716-17 (“[T]he legitimate investigation of conspiracies
    may    necessitate          the       interception        of     all     or    almost   all
    communications           over     a   given     period     of     time.”)       (collecting
    cases).
    Second,      we    consider      the    HCNTF’s     “reasonable         expectation”
    regarding        the     “content      of,    and    parties     to”     the    anticipated
    interceptions.           Id. at 716.         Here, we are concerned with whether
    the HCNTF had “sufficient advance knowledge” such that it could
    “tailor [its] minimization efforts.”                     Id. at 717.
    Outside      of    excerpts      from       the   order    that    authorized     the
    wiretap on Thomas’s phone, 2 the record provides little assistance
    on this point.            Nevertheless, we again conclude that the HCNTF
    was justified in not minimizing its interceptions.                             In relevant
    part, the order states,
    2
    The excerpts that Thomas and White have provided here are
    from an order that authorized a wiretap for another defendant.
    Regardless, because the government has cited to these excerpts
    in its brief, we rely on them as accurate reflections of the
    authorizing order for Thomas’s phone.
    9
    Due to the nature of this electronic surveillance
    investigation, . . .  and  the   fact   that  personal
    conversations during intercepted calls may frequently
    be interwoven with or precede conversations of a
    criminal nature, initially, for the first three days,
    all calls intercepted will be both monitored and
    recorded for approximately three (3) minutes before
    spot monitoring will be utilized.     . . . After the
    first three days, plant operators are to consider the
    previously established patterns of conversations, if
    any, and the identities of the conversants in
    determining when a conversation is of a non-pertinent
    nature. 3
    Although this excerpt does not provide explicit indication of
    the       “advance        knowledge”     possessed        by    the    HCNTF,      its
    authorization        to    intercept     the    initial    three   minutes   of    all
    calls for the first three days implies a less-than-robust level
    of “advance knowledge.”             And this implication is bolstered by
    the   order’s    grant       of   full   discretion       to   plant   operators   in
    distinguishing        which       conversations      were      pertinent     to    the
    investigation.        These factors lead us to again conclude that to
    the extent the HCNTF failed to minimize any of its interceptions
    on Thomas’s phone, such action was reasonable.
    3
    The record lacks any quotes from the applications and
    affidavits on which the authorizing judge based his finding of
    probable cause for issuance of the order.    We note, however,
    that Thomas and White have not contested the district court’s
    pre-trial finding that the order was supported by “ample
    probable cause.” Accordingly, we rely on what the order implies
    regarding the facts that necessitated its issuance, viewing it
    in a manner that favors the government.  See Jamison, 509 F.3d
    at 628.
    10
    Finally, we address the third factor, judicial supervision.
    As to this step, the record is silent.                           We may still conclude,
    however, that the HCNTF’s presumably unrestricted interceptions
    were       reasonable.             While       the      Omnibus        Act     permits       “the
    [authorizing]            judge     to    ask      for       interim    reports        from   the
    investigating agents,” it does not require that the judge do so.
    Quintana, 508 F.2d at 875 (noting that “[t]he statute permits
    but    does   not        require”       interim       reports);       see    also   18   U.S.C.
    § 2518(6)      (“Whenever           an     order        authorizing         interception      is
    entered pursuant to this chapter, the order may require reports
    to    be   made     to    the    judge     who     issued      the    order    showing       what
    progress      has    been       made     toward       achievement      of    the    authorized
    objective and the need for continued interception.                              Such reports
    shall be made at such intervals as the judge may require.”).
    Accordingly, even assuming that the HCNTF provided no progress
    reports to the authorizing judge, its unrestricted interceptions
    were not per se unlawful.                 Cf. Clerkley, 556 F.2d at 718 (“Where
    the    authorizing         judge    required          and    reviewed       interim    reports,
    courts have been more willing to find a good faith attempt at
    minimization.” (citing Quintana, 508 F.2d at 875)).
    Having reviewed the limited record and the circumstances
    under which the HCNTF conducted its wiretap on Thomas’s phone,
    we conclude that the HCNTF acted reasonably, even if it failed
    to minimize any of its interceptions.                           Simply put, Thomas and
    11
    White have produced no evidence that compels us to find error.
    And although the government’s evidence is slim, we must examine
    it in a manner that inures to its benefit.                   Jamison, 509 F.3d at
    628.        Accordingly,    we    hold     that    the   district     court   properly
    denied Thomas and White’s motion to suppress the government’s
    wiretap evidence based on their contention that the HCNTF failed
    to minimize its interceptions.
    2.
    We    turn   now    to    Thomas    and    White’s   allegation        that   the
    government       violated        Thomas’s        attorney-client       privilege     by
    intercepting        his   voicemail       message.       Evidentiary    rulings      are
    subject to harmless error review.                    See United States v. Cole,
    
    631 F.3d 146
    , 154 (4th Cir. 2011) (“[A] conviction will not be
    overturned on account of an erroneous evidentiary ruling when
    that error is deemed harmless within the meaning of Federal Rule
    of Criminal Procedure 52(a).”).               Under this standard, “to find a
    district court’s error harmless, we need only be able to say
    with fair assurance, after pondering all that happened without
    stripping the erroneous action from the whole, that the judgment
    was not substantially swayed by the error.”                      United States v.
    Brooks, 
    111 F.3d 365
    , 371 (4th Cir. 1997) (quoting United States
    v. Heater, 
    63 F.3d 311
    , 325 (4th Cir. 1995)) (internal quotation
    marks       omitted).      Here,    we     conclude      that   any    violation     of
    12
    Thomas’s     attorney-client        privilege     was     harmless;        thus,   we
    decline to rule on whether the district court properly denied
    Thomas and White’s suppression motion on this basis.                       See United
    States v. Banks, 
    482 F.3d 733
    , 741 (4th Cir. 2007) (“We need not
    decide whether the district court erred . . . because we hold
    that any error would be harmless . . . .”).
    Thomas and White allege,
    Given the obvious importance of the call, as well
    as the fact that the interception occurred early in
    the investigation, there is a substantial probability
    that   evidence  derived   from  the   privileged  and
    indisputably important call was improperly used as a
    basis for further wiretaps or was introduced at
    trial . . . .
    And the government counters,
    [W]hile   the   call   was  pertinent  from   the
    standpoint that Thomas provided a different number
    than the one he was calling from, no conversations on
    the other phone number were ever obtained.    The only
    line that was intercepted by investigators with regard
    to Thomas was the number from which he placed the call
    to the attorney’s [voicemail] system.
    The    government       has   indicated    that    it   did     not    intercept
    calls on the alternate number given by Thomas, and Thomas and
    White   have      provided    no   evidence    that     leads   us    to     conclude
    otherwise.     Moreover, Thomas’s inquiry related to a civil case,
    not this criminal matter.             Accordingly, we conclude that any
    violation    of    Thomas’s    attorney-client        privilege      was    harmless,
    and we decline to reverse Thomas’s and White’s convictions on
    13
    the ground that the government’s wiretap evidence should have
    been suppressed.
    B.
    Next, we consider the three evidentiary claims that Thomas
    and White failed to raise below:                     (1) that admission of their
    criminal      history    under    Federal       Rule      of   Evidence   404(b)       was
    unduly prejudicial, (2) that Detective Brandon Underhill lacked
    sufficient credentials for portions of his expert testimony, and
    (3)   that    Underhill       testified    both      as    a   fact   witness    and    an
    expert      witness     without    appropriate            safeguards    against     jury
    confusion. 4
    Because Thomas and White failed to preserve these issues,
    our       “authority     to     [provide        a]     remedy . . . is          strictly
    circumscribed.”         Puckett v. United States, 
    556 U.S. 129
    , 134
    (2009).      Indeed, when a party does not inform a trial court of
    an error at the time that it occurs, the party is barred from
    4
    The table of contents and facts section of Thomas and
    White’s brief indicates their belief that other law enforcement
    officers also provided expert testimony regarding matters about
    which they had not been qualified as experts, and that the
    district court erred in admitting such testimony.        Because
    Thomas and White failed to develop this apparent argument in the
    body of their brief, we decline to consider it here.    See Fed.
    R. App. P. 28(a)(9)(A) (requiring the argument section of an
    appellant’s   opening   brief   to   include  the   “appellant’s
    contentions and the reasons for them”).
    14
    raising that issue on appeal, id. at 135, unless it can show
    that    an   error        “(1)       was     made,    (2)     is     plain    (i.e.,    clear        or
    obvious), and (3) affects substantial rights,” United States v.
    Strieper,     
    666 F.3d 288
    ,     295   (4th     Cir.     2012)     (quoting       United
    States v. Lynn, 
    592 F.3d 572
    , 577 (4th Cir. 2010)).                                    Even then,
    we “may exercise [our] discretion to correct the error only if
    it     ‘seriously          affects          the      fairness,        integrity        or     public
    reputation of judicial proceedings.’”                           Id. at 295 (alteration in
    original) (quoting Lynn, 592 F.3d at 577).
    1.
    First,        we        review       Thomas      and    White’s        contention           that
    admission       of    their          criminal        history        under    Federal        Rule     of
    Evidence     404(b)            was        unduly   prejudicial.              Federal        Rule    of
    Evidence 404(b) disallows admission of “[e]vidence of a crime,
    wrong, or other act . . . to prove a person’s character in order
    to   show    that         on    a    particular         occasion      the     person    acted        in
    accordance with [that] character.”                             Although such evidence is
    admissible      to        prove,          inter    alia,      that    a     defendant       had     the
    requisite       “intent”             or     “knowledge”        to    commit     the     crime       in
    question, Fed. R. Evid. 404(b)(2), it becomes inadmissible if
    its “probative value is substantially outweighed by a danger
    of . . . unfair prejudice,” Fed. R. Evid. 403.
    15
    a.
    Pre-trial, the government filed a motion seeking to admit
    evidence of a prior narcotics conviction for each appellant and
    a   prior   firearm     conviction      for   Thomas.      The   district    court
    granted the motion, reasoning that the evidence was admissible
    because     it   related    to   the   knowledge    and   intent      necessary    to
    commit the crimes for which Thomas and White were on trial.                        It
    also reasoned that the evidence would not unfairly prejudice
    Thomas and White under Federal Rule of Evidence 403 because it
    did   not    “involve      conduct     that   was   any   more   sensational      or
    disturbing than the crimes” with which Thomas and White were
    charged     in   the    present      case.     Accordingly,      at    trial,     per
    stipulation of the parties, the government stated,
    White, on or about October 27 of 2001, was convicted
    and sentenced . . . for the crimes of controlled
    dangerous   substance,  manufacture,  distribution  of
    narcotics and possession with intent to distribute
    narcotics. This evidence is relevant to the issue of
    knowledge and intent regarding the crime for which the
    defendant stands accused.
    Further, regarding Thomas, it stated,
    Thomas, on or about August 12, 1992, was convicted and
    sentenced . . . for   the   crime  of  conspiracy   to
    distribute cocaine, and[,] . . . on or about October
    10, 1997, was convicted and sentenced . . . for the
    crime of attempted distribution of cocaine[, and] on
    or about June 22, 1994 . . . was convicted . . . on
    two counts of criminal possession of a weapon in the
    third degree, to wit, handguns.
    16
    The   district      court      then    immediately        instructed      the      jury    as
    follows:
    This evidence is being offered only on the issue of
    knowledge and intent. It is not to be accepted by you
    that someone is a bad person because of a prior
    conviction, it is not to be considered by you in terms
    of a propensity to commit an offense.     It is merely
    being offered on the issue of knowledge and intent,
    which is very important in this case, and it’s being
    offered in that context alone and no other context.
    Following     this      clarification      from      the     court,    the    government
    proceeded with the remainder of its case.
    After       the   government       closed        its    case,    but      prior      to
    presentation of defense evidence and witnesses, Juror Number 12
    submitted     a    list    of    questions      to     the    court.         One    of    the
    questions     said,      “What    is    meant     by    the    stipulation         for    her
    knowledge and not to show good or bad person?”                          After a bench
    conference in which the judge shared the questions with counsel
    for each party, he said to the jury, “Ladies and gentlemen,
    actually      [J]uror          Number     12,        with      respect        to     those
    questions, . . . I             have     made      those       questions       that        you
    have . . . known          to    the    lawyers,      they     can   address        them    in
    whatever fashion they want.”               Counsel for Thomas and White did
    not object to the manner in which the court dealt with Juror
    Number 12’s questions.
    During closing arguments, counsel for White and counsel for
    the government both referenced the purpose for which the prior
    17
    conviction evidence was admitted.          In its closing argument, the
    government   stated,    “Now,   [counsel    for    White]     in   his   opening
    [argument] told you that his client, I think the word he used
    was a p[au]per.      Most respectfully, I don’t think there’s any
    evidence for that, but I submit to you what there is evidence
    [of] is that he’s a criminal.”             Similarly, in rebuttal, the
    government stated,
    Mr. White’s status is not the issue in this case,
    ladies and gentlemen.    His status is not an issue.
    He’s a criminal.      Because the evidence that we
    presented over the last week establishes that he’s
    guilty.   And as such, the government has proven his
    criminal conduct. We’re not here to prove his status
    or attack him as a person.
    Again, counsel for Thomas and White recorded no objection to
    these statements.
    Here, Thomas and White cite Juror Number 12’s question and
    the government’s statements during closing as evidence that they
    were unfairly prejudiced by admission of the prior conviction
    evidence.    We disagree.
    b.
    First, Thomas’s and White’s prior convictions were similar
    to the charges they faced in this case.                 Such evidence was
    therefore    relevant   to   whether     they     possessed    the   requisite
    knowledge and intent to commit the narcotics crimes with which
    they were charged.      Furthermore, immediately after admission of
    the evidence, the court provided clear instructions to the jury
    18
    as    to   the    legitimate          implications           of   the    prior     convictions.
    Thomas      and        White       argue,        of     course,     that        this     limiting
    instruction           was     insufficient        to     assuage        the    prejudice       that
    resulted.         But       they     fail    to       tell   us   exactly       what    prejudice
    ensued.     In their brief, they argue,
    When the jurors stated mid-trial that they did not
    understand the court’s [404(b)] instructions regarding
    use of prior acts to establish whether the defendant
    is a “good or bad person,” the court was presented
    with clear evidence of unfair prejudice . . . and
    [had] an obligation to take appropriate corrective
    measures at that time.
    But    such      is     not    the     case.           First,     “the        jurors”    did    not
    collectively state anything regarding a lack of understanding.
    Rather, one juror, Juror Number 12, posed a question regarding
    the appropriate use of the evidence.                              Moreover, Juror Number
    12’s question did not “present[]” the court “with clear evidence
    of unfair prejudice.”                   Instead, it simply revealed confusion
    about the court’s limiting instruction.                           To the extent that such
    confusion        resulted       in    unfair          prejudice,    that        result    is    not
    “clear or obvious” to us, as the plain error standard requires.
    Second,         we     decline       to    conclude        that    the      government’s
    comments      during          closing       arguments        caused      unfair        prejudice.
    Taken in context, neither comment clearly referred to White’s
    prior conviction; rather, the statements simply urged that on
    the whole, the evidence presented during trial indicated that
    White was “a criminal.”                 In our view, the comments referred to
    19
    White’s status based on his actions in the present case; they
    did not beseech the jury to issue a guilty verdict based on
    White’s prior criminal conduct.    To the extent that the comments
    were interpreted as a reference to White’s prior conduct, such a
    result is not “clear or obvious.”      Thus, we decline to reverse
    Thomas’s and White’s convictions based on the district court’s
    admission of evidence regarding their previous crimes or the
    government’s statements during closing argument.
    2.
    Next, we review Thomas and White’s contentions regarding
    Underhill’s testimony: (1) that portions of it were unsupported
    by a reliable methodology and (2) that it mixed fact testimony
    and expert testimony, such that the jury was confused.
    a.
    When the government called Detective Underhill to testify
    as an expert, he indicated that he had been employed by the
    Harford County Sheriff’s Office for ten years and that he was
    presently assigned to work with the HCNTF.    He testified that he
    had been with the HCNTF for “just over four years” and that his
    primary duties were “investigations of mid to upper level drug
    traffickers and drug trafficking organizations in and around the
    Harford County area.”   Underhill further testified that he had
    20
    received      forty     hours        of   specialized          training     related         to
    narcotics investigations and had participated “in hundreds of
    arrests involving drug investigations.”                       He also stated that he
    had completed course work in other specialized areas related to
    drug investigations and undercover operations.                         Underhill noted
    that he had acted in an undercover capacity and that in that
    role    had    purchased        cocaine,      crack      cocaine,      oxycodone,       and
    marijuana.          Underhill    also     attested      that     he   had   acted      as   a
    monitor of phone calls for wiretap investigations; he estimated
    that he had monitored between 10,000 and 15,000 drug-related
    phone conversations during his career.                    Underhill testified that
    he monitored the phone calls that were intercepted on Thomas’s
    phone   in    this    case.      Relevant         to   such    monitoring,      Underhill
    indicated that it was “common” for drug conspirators “to attempt
    to   conceal    or     code    their      phone    conversations”         and   that    his
    “training,” “knowledge,” and “experience” had made him “familiar
    with those terms and codes.”
    After the parties had an opportunity to examine Underhill
    regarding his qualifications, the court asked, “Is there any
    challenge to [Underhill’s] expertise with respect to the matter
    of drug terminology and drug jargon from the point of view of
    the defense counsel?”            Defense counsel indicated that it had no
    objections.         The court then qualified Underhill as an expert “to
    testify      with    respect    to    drug   jargon      and    drug   terms     and    the
    21
    methodology        of   drug   distribution,”      cautioning         the     jury    that
    “[a]s with all witness, [it was] up to [them] to accept or
    reject [Underhill’s] testimony.”
    Underhill went on to testify as to the meaning of certain
    phrases and terms used in the phone calls that were intercepted.
    For example, Underhill testified, “Jolly Rancher is a reference
    to    crack      cocaine . . . and     Lassie      is    a    reference       to   powder
    cocaine.”        He further testified as to the phrase “outfit in the
    dryer,” explaining that “in the process of converting cocaine
    hydrochloride into cocaine base there is a drying process that
    has to take place and this is referencing that drying process.”
    And   as    to    the   phrase   “I    don’t     think       Shorty’s    dressed      up,”
    Underhill interpreted it to mean, “[a]ll [the seller] has is
    cocaine powder, he doesn’t have any cocaine that’s been cooked
    up into crack cocaine.”
    At one point during Underhill’s testimony, referring to a
    recorded      phone     call   that   had   been   played       for     the   jury,    the
    government engaged in the following colloquy with Underhill:
    Q.     Detective Underhill, there’s a reference to Mr.
    Moore telling Mr. White that he was holding that
    for him and Mr. White responding that he has the
    change for that.
    A.     Yes.
    Q.     What is that a reference to, sir?
    A.     Mr. Moore had cocaine for Mr. White and Mr. White
    was indicating that he had money for him.
    22
    Immediately following this testimony, without any objection by
    defense    counsel,     the    court      initiated       a   bench     conference     and
    cautioned the government to keep Underhill’s testimony within
    “the ambit of an expert.”                In the court’s view, “the phrase I
    was holding that for you in no way involve[d] expertise as to
    drug language.”          The court did not strike this testimony or
    instruct the jury to disregard it, however.
    In     addition     to    providing        expert        testimony    as    to    the
    interpretation of coded words and phrases from intercepted phone
    calls,    Underhill     also    testified       as    a   fact    witness       regarding
    various aspects of the case—the circumstances of arrests, the
    recovery of drugs, and the execution of a search warrant.                              When
    Underhill provided this testimony, neither the parties nor the
    court     distinguished       it    from    the      expert      testimony      that    he
    provided.         According        to     Thomas      and      White,     “[Underhill]
    seamlessly transitioned between lay and expert testimony.”
    At     the   end     of       the    trial,      during      its     formal       jury
    instructions,      the     court         referenced       Underhill’s        testimony,
    stating,
    In weighing [expert] opinion testimony, you may
    consider the witness’s qualifications, his or her
    opinions, the reasons for testifying as well as all of
    the other considerations that ordinarily apply when
    you are deciding whether or not to believe a witness’s
    testimony.    You may give the opinion testimony
    whatever weight, if any, you find it deserves in light
    of all of the evidence in this case. You should not,
    23
    however, accept opinion testimony merely because I
    allow the witness to testify concerning his or her
    opinion, nor should you substitute it for your own
    reason, judgment and common sense.
    b.
    Federal     Rule    of    Evidence    702    governs      the        admission    of
    expert testimony, stipulating, inter alia, that “[a] witness who
    is qualified as an expert . . . may testify in the form of an
    opinion . . . if . . . the testimony is the product of reliable
    principles    and    methods.”         Notably,        Thomas   and       White    do    not
    challenge Underhill’s qualification as an expert.                           They instead
    contest      the     methodology       that        supported          his     testimony,
    maintaining that his opinion regarding the meaning of terms and
    phrases was simply “rank speculation.”                    They aver that “almost
    no topic of conversation was safe from Detective Underhill’s
    leap to a connection with the drug world” and that “almost never
    did    Detective    Underhill       explain      the    methodology          he   used   in
    concluding that certain words [were] used as drug code rather
    than because of their plain and ordinary meaning.”                           We conclude
    otherwise.
    Before analyzing the intricacies of Underhill’s testimony,
    we    reiterate    the    well-settled       principle     that       a     “trial   judge
    [has] considerable leeway in deciding in a particular case how
    to go about determining whether particular expert testimony is
    reliable.”    Kumho       Tire   Co.   v.    Carmichael,        
    526 U.S. 137
    ,   152
    24
    (1999).       Moreover, this Court has previously advised that the
    “test    of    reliability        [in    Federal   Rule   of    Evidence    702]   is
    flexible.”      United States v. Wilson, 
    484 F.3d 267
    , 274 (4th Cir.
    2007)    (quoting      Kumho      Tire    Co.,   526    U.S.   at    141-42).      For
    example,       experiential       expert     testimony     is       noticeably   less
    “testable” than testimony based on pure science; nevertheless,
    per Rule 702, experience can still form the basis for reliable
    expert testimony.           Id.    Indeed, the advisory committee notes to
    Rule 702 explicitly contemplate the use of experiential expert
    testimony by law enforcement agents in a trial that involves
    drug transactions:
    [T]he principle used by the agent is that participants
    in such transactions regularly use code words to
    conceal the nature of their activities.      The method
    used by the agent is the application of extensive
    experience    to   analyze    the   meaning    of   the
    conversations.   So long as the principles and methods
    are reliable and applied reliably to the facts of the
    case, this type of testimony should be admitted.
    Fed.    R.    Evid.   702    advisory     committee’s     note.       Further,   this
    Court has previously held that “law enforcement officers with
    extensive drug experience are qualified to give expert testimony
    on the meaning of drug-related code words.”                    Wilson, 484 F.3d at
    275.
    Thomas and White are concerned about the explanation of
    methodology      (or    lack      thereof)       that   accompanied      Underhill’s
    testimony.      But our precedent does not require a law enforcement
    25
    officer providing experiential expert testimony to painstakingly
    explain       his    deciphering     methodology.             See     United      States    v.
    Baptiste, 
    596 F.3d 214
    , 222-23 & n.6 (4th Cir. 2010) (holding
    that a district court did not commit plain error in admitting
    the     testimony      of    a   drug   expert         when    that    expert       had    not
    “specifically          mention[ed]        the     word        ‘methodology’          in    his
    testimony” but had stated that he was experientially “familiar
    with the street-level jargon associated with drug trafficking”
    and that he decoded conversations by examining their context).
    Thus, to the extent that the district court erred in finding
    Underhill’s         methodology     sufficiently        reliable,          such    error   was
    not plain.
    Thomas      and     White   are     also        concerned          that    Underhill
    interpreted phrases that were commonplace and not in need of
    elucidation by an expert.               Again, we find that if the district
    court erred, such error was not plain.                        Even assuming, for the
    sake    of    argument      only,   that    the    court       should       have    stricken
    Underhill’s testimony regarding the phrase “I was holding that
    for you,”        we cannot ascertain that the court’s failure to do so
    violated Thomas’s and White’s substantial rights, especially in
    light    of    the    two    instructions        the    court       gave    regarding      the
    weight of the testimony.             Accordingly, we decline to reverse the
    verdict on this ground.
    26
    c.
    Thomas       and        White        also    contend          that      when     Underhill
    “seamlessly” testified both as an expert and fact witness, the
    district court failed to adopt adequate safeguards to prevent
    jury confusion.          Dual-role testimony is not per se prejudicial
    to a defendant.             Baptise, 596 F.3d at 224.                      However, when a
    witness plays such a dual role, the district court must take
    precautions to ensure that the jury does not become confused and
    accord    undue    weight       to     fact      witness      testimony        given      by    the
    expert.     Id. (quoting Wilson, 484 F.3d at 278 n.5).                              Appropriate
    precautions       include       (1)    having         the    expert       witness     make      two
    separate     trips      to     the     stand      and       (2)    issuing     a     cautionary
    instruction to the jury regarding the witness’s dual role.                                  Id.
    Here,    lay       and     expert      testimony         were    interwoven          and     no
    cautionary     instruction            was    issued;        thus,     the     risk     of      jury
    confusion    was       high.      This      Court       recently      addressed       a   nearly
    identical    circumstance            in     Baptiste.             Although    it     ultimately
    declined to reverse the jury verdict in that case because it was
    constrained       by    a      plain      error       standard       and     “the    facts        in
    the . . . case placed it in a gray area of the law,” the court
    issued a caution regarding the handling of dual-role testimony:
    [W]e note that the district courts should take steps
    to ensure that there is a clear demarcation in the
    jury’s mind between a witness’s lay and expert roles.
    This may be accomplished, for example, by cautionary
    warnings or instructions, by requiring the witness to
    27
    take separate trips to the stand in each capacity, or
    by ensuring that counsel makes clear when he is
    eliciting lay versus expert testimony.
    Baptiste, 596 F.3d at 225 n.9.
    Given our discussion of appropriate safeguards in Baptiste,
    and the district court’s failure in this case to implement any
    of those safeguards, we can readily say that the court erred in
    not employing methods to help the jurors “understand that they
    [could] not give [Underhill’s] lay testimony additional weight
    simply because of his dual-role as an expert.”               Id.   We cannot
    say that the district court’s error merits reversal, however.
    Under the plain error standard, reversal requires an obvious
    error that affects substantial rights.             Thomas and White have
    failed to demonstrate how the district court’s error rises to
    such a level.       In their brief, they claim that “[t]he errors
    were numerous and the confusion widespread.”              However, they fail
    to cite any specific examples of this “widespread” confusion.
    Accordingly, we are once again constrained to uphold the jury’s
    verdict.
    II.
    Thomas and White next contend that the district court erred
    in declining to give a multiple conspiracies jury instruction.
    A   multiple   conspiracies    jury   instruction    is    appropriate   when
    “the   proof   at   trial   demonstrates    that   [the]    appellants   were
    28
    involved only in separate conspiracies unrelated to the overall
    conspiracy       charged    in    the    indictment.”             United      States   v.
    Squillacote, 
    221 F.3d 542
    , 574 (4th Cir. 2000) (quoting United
    States v. Kennedy, 
    32 F.3d 876
    , 884 (4th Cir. 1994)) (internal
    quotation marks omitted).
    The government’s evidence supporting Thomas’s and White’s
    conspiracy      charges    consisted       of    (1)    wiretap    evidence      showing
    contact between Michael Moore 5 and Thomas and between Moore and
    White    and    (2)    evidence   showing       that    Moore     and   Thomas    shared
    customers—namely, Stokes, Leandre Preston, and Joseph Hensley,
    all individuals who were apprehended with Thomas and White.
    At the jury charge conference, Thomas and White requested a
    multiple       conspiracies      jury    instruction,      maintaining         that    the
    government’s          evidence    proved        there    were     “essentially         two
    distribution       networks”      with    individual       buyers       and    that    the
    government made “no connection between the distribution networks
    and any of [the] individual buyers.”                    The district court denied
    Thomas and White’s request, and they contend that it erred in
    doing so.
    “We review [a] district court’s decision to give or refuse
    to give a jury instruction for abuse of discretion.”                              United
    5
    Michael Moore was charged with White and Thomas but is not
    a party to this appeal.
    29
    States v. Sarwari, 
    669 F.3d 401
    , 410–11 (4th Cir. 2012) (quoting
    United States v. Passaro, 
    577 F.3d 207
    , 221 (4th Cir. 2009))
    (internal quotation marks omitted).                   We will find refusal to
    give an instruction erroneous only if the requested instruction
    “(1)    was   correct,    (2)    was   not      substantially        covered    by    the
    court’s charge to the jury, and (3) dealt with some point in the
    trial    so   important     that    the    failure       to   give    the   requested
    instruction     seriously        impaired       the     defendant’s      ability       to
    conduct his defense.”           United States v. Green, 
    599 F.3d 360
    , 378
    (4th Cir. 2010) (quoting Passaro, 577 F.3d at 221).                            Here, we
    conclude the district court properly denied Thomas and White’s
    request for a multiple conspiracies jury instruction.
    Thomas   and      White     maintain      that     the   instruction          they
    requested     was   correct      because    “[t]he      government     presented       no
    evidence that [they] had any relationship with each other, or
    any acquaintances of alleged co-conspirators in common.”                             They
    admit    that    the     government       presented       evidence      that     Stokes
    purchased her drugs from both Thomas and Moore and that White
    purchased his drugs from Moore, but they aver that such evidence
    is insufficient to show that White and Thomas were involved in
    the same conspiracy.        We are unconvinced.
    Thomas and White fail to accord sufficient weight to our
    precedent regarding the proof necessary for a conspiracy.                               A
    conspiracy      need       not      “have        a      discrete,       identifiable
    30
    organizational     structure.”          United         States      v.     Banks,    
    10 F.3d 1044
    ,   1054    (4th    Cir.   1993).            Rather,      it    can     be    simply     “a
    loosely-knit association of members linked only by their mutual
    interest in sustaining the overall enterprise of catering to the
    ultimate demands of a particular drug consumption market.”                                  Id.
    Moreover, “[o]nce it has been shown that a conspiracy exists,
    the evidence need only establish a slight connection between the
    defendant and the conspiracy to support conviction.”                                  United
    States v. Burgos, 
    94 F.3d 849
    , 861 (4th Cir. 1996) (alteration
    in original) (quoting United States v. Brooks, 
    957 F.2d 1138
    ,
    1147 (4th Cir. 1992)) (internal quotation marks omitted).                                    In
    fact,   proof    of    a    conspiracy      does       not    even        require    that     a
    defendant “know all of his coconspirators.”                          Id.      Such is the
    case    here.         The    government          may    not        have     outlined        the
    organizational structure of Thomas and White’s conspiracy, but
    it   presented   evidence      sufficient         to    show       that    they     were,    at
    minimum, part of a “loosely-knit association of members” that
    existed   for    the    purpose   of     drug      trafficking.              We    therefore
    conclude that the district court did not act “arbitrarily or
    irrationally”     in    declining      to    give      the    multiple       conspiracies
    jury instruction that Thomas and White requested.
    31
    III.
    Finally, we address White’s contention that the government
    presented      insufficient        evidence        to    support     his   conspiracy
    conviction.          When   we    review      a    trial    to    determine   whether
    sufficient evidence supported conviction on a certain charge, we
    view the evidence through a lens that favors the government, and
    we ask, “Could any reasonable juror have found the defendant
    guilty of this charge beyond a reasonable doubt?”                          See United
    States v. Murphy, 
    35 F.3d 143
    , 148 (4th Cir. 1994).
    We have reviewed the evidence that the government presented
    against White, and we are satisfied that it was sufficient for a
    reasonable juror to find White guilty of conspiracy under 21
    U.S.C. § 846.        White argues that the government “may have proved
    that a drug trafficking conspiracy existed, [but] there was no
    evidence    to   support     a    finding         that . . . White       knowingly   or
    voluntarily participated in that conspiracy.”                        Further, White
    contends      that    the   government’s            circumstantial       evidence    of
    White’s participation in the sale of drugs was insufficient to
    prove his involvement in the conspiracy.                   We are unpersuaded.
    At trial, the government presented evidence showing that on
    several occasions, White called Moore to purchase powder cocaine
    and   crack    cocaine.          The   government        also    presented    evidence
    indicating     that    on   April      8,    2010,      after    White   called   Moore
    requesting cocaine, he met with Moore in a black Nissan and then
    32
    exited the Nissan and entered a white Dodge.                        After a “brief
    time, approximately a minute or so,” White exited the Dodge and
    re-entered the Nissan.           “[J]ust a couple of minutes after the
    meeting,”     law     enforcement        officers    stopped       the     Dodge    and
    discovered    crack     cocaine     in     the    driver’s       possession.        The
    government     also     presented    evidence        of       several    other     brief
    meetings between White and Moore.
    We     recognize    that     such      evidence      may     seem    negligible.
    Nonetheless, it is sufficient to support a conclusion that White
    participated in a conspiracy with Thomas and Moore.                            And when
    enough    evidence      exists      to     support        a    reasonable        juror’s
    conclusion    of    guilt,   we     will    not     second-guess         the   verdict.
    Accordingly, we again decline to reverse White’s conviction.
    IV.
    We have reviewed the evidence provided to us in the record,
    and we have considered each of Thomas’s and White’s allegations.
    Because we ascertain no reversible error, we affirm the jury’s
    verdict on all counts.
    AFFIRMED
    33