United States v. Burgos-Montes ( 2015 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 13-2305
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    EDISON BURGOS-MONTES,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF PUERTO RICO
    [Hon. Jay A. García-Gregory, U.S. District Judge]
    Before
    Lynch, Chief Judge,
    Howard and Kayatta, Circuit Judges.
    Rachel Brill for appellant.
    Francisco A. Besosa-Martínez, Assistant United States
    Attorney, with whom Rosa Emilia Rodríguez-Vélez, United States
    Attorney, and Nelson Pérez-Sosa, Assistant United States Attorney,
    Chief, Appellate Division, were on brief, for appellee.
    May 13, 2015
    KAYATTA, Circuit Judge. Edison Burgos-Montes ("Burgos")
    appeals from his conviction for two counts of drug conspiracy and
    two counts of murder.       The latter stem from the disappearance of
    Burgos' girlfriend Madelin Semidey-Morales ("Semidey") shortly
    after Burgos learned that she had been acting as a government
    informant.     Although the government sought the death penalty, the
    jury sentenced Burgos to life in prison. Burgos now challenges his
    conviction on a large number of grounds. For the reasons described
    in this opinion, we affirm the district court in full.
    I.   Background
    In this appeal, Burgos challenges the sufficiency of the
    evidence supporting his conviction, the denial of several pre-trial
    motions to suppress evidence, and a number of other district court
    actions before and during trial.        We typically recite those facts
    relevant to sufficiency claims and challenges to a denial of a
    motion to suppress in the light most favorable to the verdict or to
    the district court's ruling.       See United States v. Bayes, 
    210 F.3d 64
    , 65-66 (1st Cir. 2000) (sufficiency); United States v. Soares,
    
    521 F.3d 117
    , 118 (1st Cir. 2008) (suppression). For other issues,
    such   as   claims   of   prejudicial   error,   we   offer   a   "balanced"
    treatment, see United States v. Felton, 
    417 F.3d 97
    , 99 (1st Cir.
    2005), in which we "objectively view the evidence of record."
    United States v. Nelson-Rodríguez, 
    319 F.3d 12
    , 23 (1st Cir.
    -2-
    2003).1   Given that we cannot simultaneously recite the facts in
    both manners, we limit our initial summary of this lengthy record
    to those details essential to framing the issues on appeal.     We
    then offer the key facts relevant to each issue as part of our
    discussion of that issue, recited in the appropriate form.   We do
    the same for the standard of review for each issue.
    In October 2004, Semidey agreed to work with agents of
    the federal Drug Enforcement Administration ("DEA") to inform on
    Burgos.   Semidey had begun dating Burgos while her husband was in
    jail, and she continued to do so after her husband was released.
    Over the next nine months, Semidey moved in with Burgos and
    provided information to the DEA, arranged a meeting in which
    undercover officers negotiated a cocaine sale with Burgos (although
    1
    In doing so, we note that this circuit has been inconsistent
    in its approach to reciting the facts of the case when considering
    a challenge other than the sufficiency of the evidence to support
    a conviction. See United States v. Rodríguez-Soler, 
    773 F.3d 289
    ,
    290 (1st Cir. 2014) (discussing the inconsistency). Generally,
    though, the nature of the question on appeal and the applicable
    standard of review should make self-evident whether an appellate
    court should present the record largely in equipoise (for example,
    when it is assessing how an added or omitted item may have tipped
    the balance, see 
    Felton, 417 F.3d at 99
    ), or present the evidence
    as if the factfinder favored the prosecution's side of any factual
    disputes (to ascertain, for example, whether the evidence was
    sufficient to sustain the conviction, see United States v. Ayala-
    García, 
    574 F.3d 5
    , 8 (1st Cir. 2009)), or assume that the jury
    could well have been persuaded by the defendant's side of such
    disputes (to ascertain, for example, whether the failure to submit
    an element of the offense to the jury requires reversal in the
    absence of any objection to the failure, see United States v.
    Georgacarakos, 
    988 F.2d 1289
    , 1294-97 (1st Cir. 1993), abrogated on
    other grounds by United States v. Scott, 
    270 F.3d 30
    , 35 (1st Cir.
    2001)).
    -3-
    the sale was never consummated), and recorded conversations between
    herself and Burgos.        In these conversations, Burgos described,
    among other things, techniques for importing cocaine from the
    Dominican Republic to Puerto Rico, and the prices he generally
    charged for kilogram-quantities of cocaine.             According to trial
    testimony, sometime around June 2005, one of Burgos' employees told
    Burgos   that    Semidey   was   an   informant,    a   claim   that     Burgos
    investigated     and   confirmed.     Semidey    also   told    her    handlers
    (according to her handlers) that Burgos had threatened to kill her
    over this rumor, and suggested that if she ever disappeared, agents
    should look for her body on a "farm" that Burgos owned.               On July 4,
    2005, Semidey disappeared after telling her handler that she had
    returned to Burgos' house.       A witness at trial testified that she
    last saw Semidey getting into Burgos' car on the night Semidey
    disappeared.      Two days later, law enforcement agents observed
    Burgos supervising an employee as the employee cleaned the inside
    of Burgos' car during a rainstorm.
    After efforts to locate Semidey proved unsuccessful, DEA
    agents sought and received the authorization to wiretap Burgos'
    cell phone in September 2005.               In December, DEA agents also
    recruited    a    co-conspirator       named     Neftalí   Corales-Casiano
    ("Corales") to work as an informant.             He recorded a number of
    telephone calls between himself and Burgos between December 20 and
    28.   Most incriminating was a December 28 conversation in which
    -4-
    Corales said he was concerned that Semidey's body would be found,
    to which Burgos replied, "It won't appear."               On December 29, the
    government sought and received authorization to search Burgos'
    farm, as well as the car that agents had observed Burgos having an
    employee clean two days after Semidey disappeared.               The search of
    the car revealed traces of blood that DNA analysis suggested was
    Semidey's. Semidey never reappeared, and her body was never found.
    In January 2006, Burgos was indicted for conspiring to
    import   and    conspiring   to     possess      with   intent   to   distribute
    controlled substances in violation of 21 U.S.C. §§ 846, 841(a),
    963, and 952.     The indictment described a conspiracy lasting from
    1998 to 2005, and described a number of acts in furtherance of the
    conspiracy that took place primarily between January and June 2005,
    including      discussions   with       unindicted      co-conspirators   about
    arrangements to purchase between one and ten kilograms of cocaine,
    and stealing a boat.     A May 2006 superseding indictment added two
    murder   counts,    stemming      from    Semidey's      disappearance.     The
    indictment charged that Burgos had murdered Semidey to prevent her
    from communicating with law enforcement and to retaliate against
    her for communicating with law enforcement in violation of 18
    U.S.C.   §§    1512(a)(1)(A)      and     (C),   and    1513(a)(1)(B).2      The
    2
    The indictment also included a forfeiture count that is not
    at issue in this appeal.
    -5-
    government also notified Burgos that it would seek the death
    penalty.
    In the lead-up to trial, Burgos filed a number of motions
    seeking to strike the death penalty, all of which were denied.   He
    also filed numerous motions to suppress evidence.      Although the
    district court granted some of his motions to suppress, it denied
    both a motion to suppress the evidence obtained through the
    wiretap, United States v. Burgos Montes, No. 06-009-01(JAG), 
    2010 WL 5184844
    , at *13 (D.P.R. Dec. 20, 2010), and a motion to suppress
    evidence from the search of Burgos' car and farm. United States v.
    Burgos Montes, No. Crim. 06-009 JAG, 
    2011 WL 1743420
    , at *1 (D.P.R.
    May 2, 2011).
    After hearing thirty days of evidence, the jury convicted
    Burgos on all four counts.   During the penalty phase of the trial,
    Burgos raised allegations of possible juror bias.      The district
    court held an in camera meeting with the juror in the presence of
    counsel and determined that there was no bias, so the juror
    returned to the box and the penalty phase continued.   On the basis
    of this episode, Burgos filed a motion for acquittal or new trial.
    He also moved for acquittal or new trial on the basis that the
    evidence fell short of the minimum sufficient to convict.3       The
    3
    Burgos argued that there was insufficient evidence that
    Burgos intended to kill Semidey because she was an informant, as
    opposed to for some other reason. He also argued that the evidence
    presented at trial constituted a fatal variance from that charged
    in the indictment. The latter argument was also the basis of a
    -6-
    court denied both motions in a sealed order.           Because the jury
    could not reach a unanimous verdict on the death penalty, Burgos
    was sentenced to life imprisonment.
    Burgos filed a timely notice of appeal challenging: (1)
    the denial of the motion to suppress evidence from the wiretap, (2)
    the denial of the motion to suppress evidence from the search of
    the car and farm, (3) the denial of the motion for acquittal or new
    trial on the basis of alleged jury bias, (4) the denial of the
    motions to strike the death penalty, (5) the denial of the motions
    to acquit or for a new trial based on the sufficiency of the
    evidence, and (6) various evidentiary rulings.
    II.   Analysis
    A.   Motion To Suppress Wiretap Evidence
    Burgos challenges the district court's denial, after an
    evidentiary   hearing,   of   his   motion   to   suppress   a   number   of
    conversations recorded through a wiretap of his cell phone after
    Semidey disappeared. The wiretap was authorized under Title III of
    the Omnibus Crime Control and Safe Streets Act of 1968, 18 U.S.C.
    §§ 2510-22, which imposes a set of statutory requirements on top of
    the constitutional requirements applicable to ordinary search
    warrants.   See United States v. Nelson-Rodríguez, 
    319 F.3d 12
    , 32
    (1st Cir. 2003).    Burgos advances four primary challenges to the
    wiretap, which we address in turn.
    mistrial motion that the district court denied in open court.
    -7-
    1.     "Omitted" Information About Semidey
    Burgos' first argument is that in the affidavit in
    support of their wiretap application, the DEA agents omitted
    information about Semidey that, had it been included, would have
    precluded a finding of probable cause under the Fourth Amendment of
    the United States Constitution.           In assessing such an argument
    (assuming the omitted information was intentionally or recklessly
    withheld), we ask whether the application, had it contained the
    omitted information, would still have provided a "sufficient" basis
    for authorizing the wiretap.4        United States v. Young, 
    877 F.2d 1099
    , 1102-03 (1st Cir. 1989) (citing Franks v. Delaware, 
    438 U.S. 154
    , 171-72 (1978)).
    The government's application for authorization to conduct
    a thirty-day wiretap of Burgos' cell phone was supported by a
    thirty-seven-page affidavit filed by DEA Agent Jacobsen, with the
    participation of Agent Iglesias, who was the lead agent on the
    case.        The affidavit described the investigation as being led by
    the DEA and involving the FBI, the Puerto Rico Police Department,
    and two Puerto Rico investigative units, the Hacienda and the NIE.
    4
    Young used several terms to describe the standard it was
    applying to the reformed affidavit, including "adequate,"
    "sufficient," and whether the omissions were "material" to a
    finding of probable 
    cause. 877 F.2d at 1102-04
    There is nothing
    to suggest the court intended the terms to convey different
    meanings; indeed, its reliance on Franks makes clear it was
    applying a sufficiency standard.      
    Franks, 438 U.S. at 171-72
    (asking whether a reformed affidavit contained "sufficient content
    . . . to support a finding of probable cause").
    -8-
    In addition to Burgos, one of the five targeted individuals was
    Corales, whom the affidavit described as a former police officer
    who was fired for corruption allegations in 1997, and who had
    multiple felony arrests and convictions between 1995 and 1998.
    The   evidence      supporting        the    affidavit       consisted     of
    information from three confidential sources, including Semidey
    (through her reports submitted prior to her disappearance).                            The
    first two sources described the activities of named individuals
    believed to be lower-level members of a drug trafficking conspiracy
    that brought cocaine into Puerto Rico from the Dominican Republic.
    The evidence connecting Burgos to drug trafficking came from or
    through   Semidey.          According      to    the    affidavit,        she   described
    conversations in which Burgos said he could procure large amounts
    of cocaine.     She also helped arrange a meeting between Burgos and
    undercover officers, which was recorded, and in which the officers
    arranged a cocaine purchase.              Toll registers confirmed that Burgos
    was in contact with the people that Semidey said he called to
    discuss the planned sale to the officers.                     Burgos never delivered
    any drugs, however.
    The application also described Semidey's statements that
    Burgos suspected the undercover officers were officers and that he
    had   confronted      her      with   a    rumor      that    she   was    cooperating.
    According     to   the      affidavit,      Burgos       threatened       to    make   her
    "disappear     from      the    earth."          It    also    described        Semidey's
    -9-
    disappearance on July 4, 2005, and agents' observations of Burgos
    supervising as an employee "rigorously" washed the interior of
    Burgos' car during a rainstorm on July 6.
    The affidavit described Semidey as a paid informant who
    was cooperating for personal reasons.             It then described her
    observations of Burgos' drug activities, her role in helping to
    arrange a failed buy-bust, the fact that Burgos had threatened her,
    and her disappearance. "Omitted" from the affidavit were the facts
    that Semidey was in a relationship with Burgos, that she was
    married to another man who had been released from prison shortly
    before she agreed to inform on Burgos, and that she may have been
    trying to avoid prosecution on unrelated charges.5
    Nothing in these omitted facts materially undercuts the
    affidavit's ample demonstration of probable cause.            The omitted
    information furnishes, at best, grist for a somewhat conjectural
    and by no means strong argument that one might make to discredit
    Semidey.   None of this grist is so probative as to make its
    omission particularly notable.       See 
    Young, 877 F.2d at 1103
    ("The
    law does not require an officer swearing out an affidavit for a
    warrant to include all possible impeachment material. It need only
    explain that the officer has found the informant to be reasonably
    reliable.").    We   note,   too,    that   key   portions   of   Semidey's
    5
    While there was trial testimony by Semidey's mother and
    sister that Semidey agreed to be an informant to avoid possible
    prosecution in another matter, the DEA agents involved denied this.
    -10-
    statements in the affidavit were corroborated within the affidavit
    itself.        The affidavit reflects that after Semidey introduced
    Burgos to undercover agents, Burgos himself spoke with undercover
    agents on at least three occasions regarding a potential cocaine
    sale.       Moreover, toll records corroborated Semidey's descriptions
    of Burgos' telephone communications about this potential sale.
    In sum, even had the affidavit included the omitted
    information, the affidavit would easily have contained a sufficient
    basis for concluding that a wiretap would produce evidence that
    Burgos was involved in a drug conspiracy or murder.             Burgos'
    challenge to the wiretap based on this "omission" of information
    concerning Semidey therefore fails.6       
    Young, 877 F.2d at 1102
    .
    2.     "Omitted" Information About Corales
    Burgos' next argument trains on the so-called "necessity"
    requirement of 18 U.S.C. § 2518(1)(c).        This subsection provides
    that wiretaps are generally only available when the government
    shows with a "full and complete statement . . . whether or not
    other investigative procedures have been tried and failed or why
    they reasonably appear to be unlikely to succeed if tried or to be
    too dangerous."       
    Id. 6 Our
    conclusion that the affidavit contained a sufficient
    basis to establish probable cause for the wiretap at the time of
    the Title III application also disposes of Burgos' argument that
    the information contained in the affidavit was "stale."
    -11-
    According to Burgos, the affidavit's claim that a wiretap
    was necessary was deficient because it did not provide "full and
    complete" information about Corales.   Specifically, Burgos argues
    that the affidavit did not give any indication that Corales had
    sometimes worked as an informant and could potentially be used as
    one in this investigation.   Burgos argues that a wiretap could not
    have been necessary until the government first tried to use Corales
    as an informant.
    In considering a claim that improperly omitted facts
    undermine the necessity of a wiretap, we use a similar approach to
    that which we use to assess a claim that such omissions undermine
    probable cause:    we ask whether, had the omitted information been
    included, there would still have been a "minimally adequate" basis
    for determining that the wiretap was necessary.7   See United States
    v. Cartagena, 
    593 F.3d 104
    , 109-11 (1st Cir. 2010).
    The answer to this question is "yes."       The affidavit
    explained why normal investigative techniques were not expected to
    yield results. In particular, agents had twice tried and failed to
    arrange a buy-bust, and using other informants was dangerous, given
    what appeared to have happened to Semidey.         That explanation
    provides more than adequate support for a conclusion that the
    exigencies did not warrant further delay in order to try to recruit
    7
    We do not read the "minimally adequate" standard to differ
    substantively from the sufficiency standard applied to a challenge
    that omissions undermine probable cause. See footnote 
    4, supra
    .
    -12-
    yet another confidential informant, much less for what appeared to
    be an exceedingly dangerous mission.            See 18 U.S.C. § 2518(1)(c)
    (recognizing      that   some   investigative     techniques     may   be    "too
    dangerous").       Whether Corales could have been recruited as an
    informant (or even the fact that he later acquired his own reasons
    to volunteer as an informant, as discussed in footnote 10 of this
    opinion) is therefore beside the point.
    3.      Sealing Of The Wiretap Recordings
    We   now    turn   to   Burgos'   argument   that   the    wiretap
    application failed to comply with certain procedural requirements
    under 18 U.S.C. § 2518(8)(a).             That subsection provides that
    "[i]mmediately upon the expiration of the period of the order"
    authorizing a wiretap, "such recordings shall be made available to
    the judge issuing such order and sealed under his directions." 
    Id. It further
    provides that "[t]he presence of the seal provided for
    by this subsection, or a satisfactory explanation for the absence
    thereof" is a prerequisite for any use of the evidence.                
    Id. Burgos makes
    two arguments:         (1) that the records were
    not sealed "immediately," because the government ended the wiretap
    on September 30 but the recordings were not sealed until October 7,
    and (2) that they were not sealed by the same judge who had issued
    the order.    The government does not dispute these deviations from
    the statutory requirements.          It argues, however, that because it
    has offered a "satisfactory explanation" for the late sealing, and
    -13-
    because the use of a different judge is immaterial, the recordings
    need not be suppressed.    After an evidentiary hearing to consider
    the issue of sealing, the district court denied Burgos' motion to
    suppress the wiretap evidence on these grounds.         Burgos Montes,
    
    2010 WL 5184844
    , at *5-8.
    Before turning to the substance, we must first address
    the threshold issue of the proper standard of review.          Neither
    party points us to a standard of review for the question of whether
    the government's explanation for the absence of a seal that
    complies    with   the   requirements   of    section   2518(8)(a)   is
    "satisfactory."    It appears that this circuit has never expressly
    articulated one.    Other circuits are split, with some employing a
    clearly erroneous standard, see, e.g., United States v. Coney, 
    407 F.3d 871
    , 874 (7th Cir. 2005), and others applying plenary review
    to the question of whether the explanation is satisfactory, even
    though subsidiary factual questions are reviewed for clear error,
    see, e.g., United States v. Sawyers, 
    963 F.2d 157
    , 159 (8th Cir.
    1992).     In United States v. Mora, 
    821 F.2d 860
    , 869-70 (1st Cir.
    1987), which articulated the factors that define a "satisfactory
    explanation" in this circuit, we accepted the district court's
    supported subsidiary factual findings, but applied de novo review
    to whether those facts were satisfactory under the newly announced
    test.    We will follow in those footsteps.
    -14-
    In assessing the ramifications of an untimely sealing,
    Mora established that the key inquiry was whether the government
    had proven "by clear and convincing evidence that the integrity of
    the tapes ha[d] not been compromised."   
    Id. at 867.
      Sealing helps
    ensure and demonstrate a lack of tampering.      To the extent that
    there is any delay in sealing, the field may open more widely for
    the defendant to question and explore what happened to the records
    pre-sealing.
    Here, the district court concluded that Iglesias was
    credible in his testimony that the "recordings were kept in a
    manner that sufficiently excludes the possibility of tampering,"
    and noted that Burgos had not even argued that they had been
    tampered with.    Burgos Montes, 
    2010 WL 5184844
    , at *7.   On appeal,
    Burgos again offers no allegations of tampering.   While the burden
    of proof is on the government, this does not mean the government
    must prove a negative when the defendant does not even allege that
    tampering has taken place.    Burgos also does not offer any facts
    speaking to the other factors in Mora, particularly indications of
    bad faith by law enforcement personnel or prejudice to him--his
    argument simply turns on the bare fact that seven days is not
    "immediately."     However, in Mora itself, the court found that
    delays of twenty and forty-one days, while concerning, did not
    automatically require suppression in light of the other factors.
    
    Id. at 869.
         We conclude the same here regarding the seven-day
    -15-
    delay, given the lack of any evidence of tampering or other
    possible prejudice, and the lack of evidence of bad faith.
    We can also quickly dispense with Burgos' objection to
    the sealing of the recordings by a judge other than the one who
    approved the wiretap.   When Iglesias took the recordings to the
    issuing judge, he was told that the judge was unavailable and was
    sent to a different judge, who sealed them.    Burgos cites no case
    where recordings have been suppressed under such circumstances.
    Few cases have addressed the issue at all, although the Second
    Circuit has suggested in dictum that when the issuing judge's
    unavailability would result in a delay, sealing by a non-issuing
    judge is permissible.   United States v. Poeta, 
    455 F.2d 117
    , 122
    (2d Cir. 1972).   As a purely textual matter, the agents appear to
    have complied with the statute in that they "made [the recordings]
    available to the [issuing] judge" and followed her "direction[]" to
    take them to a different judge for sealing.    Thus, this argument
    also fails.
    4.   Miscellaneous Shots At The Warrant
    Burgos lobs a number of other arguments at the substance
    of the affidavit, none of which give us significant pause.       He
    argues that the affidavit was not full and complete because some
    statements were too vague, and because it includes a one-sentence
    disclaimer that the affidavit included only information relevant to
    the wiretap application and not all of the information from the
    -16-
    entire investigation.      These arguments fail on the grounds that an
    affidavit need not include the "minutiae" of an investigation. See
    
    Cartagena, 593 F.3d at 110
    ; see also United States v. Yeje-Cabrera,
    
    430 F.3d 1
    , 9-10 (1st Cir. 2005).
    Burgos also complains that the affidavit's authorization
    to include individuals "yet unknown" violates the requirement that
    the application include "the identity of the person, if known,
    committing     the    offense    and   whose   communications   are     to   be
    intercepted."        18 U.S.C. § 2518(1)(b)(iv).       He argues that the
    government knew the names of certain other individuals that would
    eventually be recorded and failed to include them.                In United
    States v. Donovan, 
    429 U.S. 413
    (1977), the Court held that this
    requirement     to    identify   individuals    extends   to    those   whose
    conversations the government has probable cause to believe would be
    intercepted.    Although it is typically the unnamed individuals who
    challenge a wiretap under such circumstances, see 
    id. at 428;
    see
    also United States v. Chiarizio, 
    525 F.2d 289
    , 291-93 (2d Cir.
    1975), we will assume without deciding that a named individual can
    also bring such a challenge because it does not affect the outcome
    here.8   Nevertheless, Burgos offers no facts establishing that the
    8
    While this would make little sense in the Fourth Amendment
    context, where the named individual would be asserting the unnamed
    individual's rights, in this context the named individual is
    claiming that his conversations were recorded pursuant to a
    statutorily deficient wiretap, even though it is difficult to see
    how the deficiency could be prejudicial.
    -17-
    government had probable cause to believe that the other individuals
    would be intercepted on the targeted telephone, so this argument
    also fails.
    B.   Motion To Suppress Evidence From Burgos' Car And Farm
    Burgos next challenges on a number of grounds the denial
    of his motion to suppress evidence seized from his car and farm
    pursuant to a search warrant.   As with the wiretap warrant, Burgos
    argues that the application for the warrant was deficient because
    of omissions and inaccuracies in the application.   In considering
    such a challenge, our approach is similar to the one we used with
    regard to the wiretap:   "we excise the offending inaccuracies and
    insert the facts recklessly omitted, and then determine whether or
    not the 'corrected' warrant affidavit would establish probable
    cause."   Burke v. Town of Walpole, 
    405 F.3d 66
    , 82 (1st Cir. 2005)
    (quoting Wilson v. Russo, 
    212 F.3d 781
    , 789 (3d Cir. 2000)).9
    Burgos also argues that the application did not satisfy the
    "particularity" requirement of the Fourth Amendment.   In reviewing
    the denial of a motion to suppress based on such a claim, we review
    the district court's fact-finding for clear error, and conclusions
    of law de novo.   United States v. Kuc, 
    737 F.3d 129
    , 132 (1st Cir.
    2013).
    9
    While the rule applies to omissions made with intentional or
    reckless disregard for the truth, see 
    Burke, 405 F.3d at 81-82
    , we
    need not decide whether or not the omissions here were reckless or
    intentional, because either way, they do not undermine probable
    cause.
    -18-
    1.     "Omitted" Information About Corales and Semidey
    A warrant application must include sufficient information
    to establish probable cause both that a crime has been committed,
    and that evidence of the crime will be found in the place to be
    searched.    United States v. Hicks, 
    575 F.3d 130
    , 136 (1st Cir.
    2009).    Burgos argues that the application for the warrant was
    deficient because it omitted material information undermining the
    credibility of Semidey and Corales, whose statements comprised much
    of the information in the affidavit.       Burgos again argues that the
    affidavit did not explain the nature of Semidey's relationship with
    Burgos or her potential motivations for serving as an informant,
    nor the fact that Corales was a disgraced former cop with a history
    of perjury and multiple felony convictions.
    The affidavit provided the following as a basis for
    probable cause:
    •           Semidey's statements to a DEA agent that Burgos had
    confronted her with a rumor that she was an informant,
    and had threatened to kill her;
    •           Semidey's statements that if she ever disappeared, law
    enforcement should look for her on Burgos' farm;
    •           Observations of Burgos having an employee "rigorously"
    wash the interior of his car in the rain two days after
    Semidey   disappeared    and   shortly   after   the   police
    contacted him with questions about Semidey;
    -19-
    •         High call volume from Burgos' phone to Semidey's that
    stopped the night of her disappearance, followed by a
    single call to her number after the police contacted him
    about her disappearance;
    •         Visual observations by Iglesias of "what appeared to be
    a   newly   turned   area     of   earth   in   the   approximate
    dimensions of a grave" on the farm;
    •         A recording of a call between Burgos and co-conspirator
    Radamés Castillo-Martinez ("Castillo") in which Castillo
    said he was concerned that something might have happened
    to Burgos because of "this girl";
    •         Statements by Corales and Castillo that Burgos knew
    Semidey was an informant;
    •         Several     statements   by     Corales,   identified    in   the
    affidavit as "CS #2," recounting conversations in which
    Burgos said he was not concerned to hear that co-
    conspirator Castillo had been arrested because he was
    confident that the police were not going to find Semidey;
    that the DEA would have arrested him by then if it could;
    and that he didn't understand how Semidey could have
    "cause[d] damage" to him after he had paid her bills and
    her children's living expenses;10
    10
    Corales volunteered to serve as an informant in December
    2005, after he learned that co-conspirator Castillo had been
    arrested on charges related to their preparations to import cocaine
    -20-
    •         A conversation between Corales and Burgos in which Burgos
    said that Semidey's body "won't appear" and that "[t]hey
    can look for her in Yauco, Ponce, and Mayaguez and
    they're not going to find her."        In the conversation,
    Burgos and Corales also made plans to bury a stolen boat
    on the farm.    (This conversation was recorded, although
    the affidavit does not make that clear.);
    •         Corales' statement that he believed Semidey may be buried
    on the farm.
    This evidence clearly suffices to establish probable
    cause, even considering the affidavit in light of the omitted
    information   about   Semidey   and   Corales.   In   particular,    the
    credibility of Semidey's statements that Burgos had threatened her
    are not undercut by the kind of information that might cast doubt
    on her credibility with regard to Burgos' drug activities.          When
    informant Jane reports that target John threatened to kill her
    because John learned that Jane is an informant, and Jane then
    disappears after last being seen getting into John's car, after
    which John is seen washing the car in a rainstorm, it almost goes
    without saying that there exists probable cause to conduct further
    investigations into John no matter what one thinks about Jane's
    motives for serving as an informant. See United States v. Hibbard,
    
    963 F.2d 1100
    , 1101-02 (8th Cir. 1992) (upholding a warrant
    from the Dominican Republic.
    -21-
    authorizing the search of defendant's residence for the whereabouts
    of a missing person based entirely on the fact that the defendant
    had threatened the victim and that the victim was last seen in the
    defendant's presence).     Whatever additional corroboration such
    statements might need is amply provided for by the recorded
    conversation between Burgos and Corales in which Burgos stated that
    Semidey was not going to appear.      In short, nothing in the omitted
    evidence cast any material doubt on Semidey's statements relevant
    to the warrant application.
    As   for   Corales,   the   corroborating   information   not
    dependent on his credibility is sufficient to establish a nexus to
    the car and the farm.   The search of the car was based primarily on
    agents' observations of Burgos having the car's interior washed in
    the rain two days after Semidey disappeared, and shortly after law
    enforcement went to Burgos house to attempt to question him.         As
    for the farm, the affidavit established a nexus based on Semidey's
    statements that law enforcement should look for her body on the
    farm if she disappeared, as well as the recorded conversation in
    which Burgos and Corales agreed to bury a boat on the farm.     Thus,
    even considering the affidavit in light of Corales' potential
    unreliability, there is a sufficient basis for probable cause.
    2.   Other Probable Cause Arguments
    Burgos makes several other arguments for why the warrant
    failed to establish probable cause.       First, he points to certain
    -22-
    inaccuracies      in    the    warrant's      description           of   events.       In
    particular, he argues that Iglesias' trial testimony regarding his
    observations of disturbed earth on the farm appear to vary from his
    description    in      the   affidavit.           As    discussed    above,   however,
    probable    cause      existed      even   without        the   observation    of     the
    disturbed earth, so we need not delve into this argument.                          As for
    the car, Burgos attempts to build a probable cause challenge based
    on the fact that the affidavit described Burgos washing the inside
    of his vehicle with an employee, while testimony in the suppression
    hearing    made   clear      that    Burgos       was    actually    supervising      the
    employee and did not participate in the washing himself.                           Burgos
    argues that having a third party wash the car is inconsistent with
    an attempt to remove evidence of a crime, where one would expect
    great secrecy.      However, the description of the car-washing in the
    affidavit does indicate that a third party, who seemed to be
    Burgos' employee, was involved, so this minor difference in how
    Iglesias described the event is not material.
    Finally, Burgos makes a staleness argument based on the
    passage of time between Semidey's disappearance in July 2005 and
    the government's application for a search warrant in December,
    after Corales agreed to cooperate.                      Burgos argues that even if
    there was probable cause to believe that there had once been
    evidence in the car, the affidavit did not include any reason to
    believe that it would have still remained six months later.                            An
    -23-
    allegation of staleness is evaluated not merely on how old the
    information is, but circumstances including the nature of the
    suspected crime, the character of the items to be seized, the
    habits of the suspect, and the nature of the premises to be
    searched.   United States v. Bucuvalas, 
    970 F.2d 937
    , 940 (1st Cir.
    1992), abrogated on other grounds by Cleveland v. United States,
    
    531 U.S. 12
    , 18 (2000).       Burgos cites no case where evidence was
    suppressed on the basis of a failure to state the common-sense
    notions that bodies often stay where they are disposed of, and that
    DNA evidence can last longer than six months, and we decline to
    announce such a rule here--particularly given that the passage of
    time    without   Semidey's   reappearance     made   foul   play    appear
    increasingly more likely.
    3.   Particularity
    Burgos next argues that the search warrant violates the
    Constitutional    requirement    that   a   warrant   must   "particularly
    describ[e] . . . [the] things to be seized."          U.S. Const. amend.
    IV.    The warrant authorizes a search for "[e]vidence and trace
    evidence relevant to the homicide of Madelin Semidey-Morales in
    violation of Title 18, United States Code, Section 1513.            See also
    the attached affidavit, which is hereby incorporated and made part
    hereof."    Burgos argues that "evidence and trace evidence" is
    insufficiently particular, and that the failure to define the kind
    of "trace evidence" sought was particularly egregious because
    -24-
    Iglesias admitted that he used the broad term precisely to avoid
    limiting the forensic analysis.
    Although federal courts do not generally uphold warrants
    authorizing the search for "evidence of crime X" unless that
    statement follows a list of illustrative examples, see United
    States v. Bithoney, 
    631 F.2d 1
    , 2-3 & n.1 (1st Cir. 1980), Burgos'
    argument fails because the warrant incorporates by reference the
    affidavit, which describes the target of the search as "the person,
    or remains, of Madelin Semidey-Morales, evidence of the manner of
    her death and her personal effects."        Affidavit language expressly
    incorporated   by   the   warrant     can   satisfy    the   particularity
    requirement.   See Rivera Rodríguez v. Beninato, 
    469 F.3d 1
    , 5 (1st
    Cir. 2006); cf. Groh v. Ramirez, 
    540 U.S. 551
    , 557-58 (2004)
    (collecting circuit cases allowing incorporation by reference and
    leaving open the possibility of incorporation).         While there still
    exists some generality in terms like "evidence of the manner of her
    death" and "her personal effects," this is a situation in which the
    "circumstances of the crime make an exact description of the fruits
    and instrumentalities a virtual impossibility."          United States v.
    Timpani, 
    665 F.2d 1
    , 5 (1st Cir. 1981) (quoting Spinelli v. United
    States, 
    382 F.2d 871
    , 886 (8th Cir. 1967)).           In such cases, "the
    searching officer can only be expected to describe the generic
    class of items he is seeking."      
    Id. (quoting Spinelli,
    382 F.2d at
    886).
    -25-
    4.      Compliance With Rule 41(e)
    Burgos next attacks the warrant on the grounds that the
    issuing magistrate failed to fill in two of the spaces on the pre-
    printed warrant form:        one for the date by which the warrant was to
    be executed, and one for the judge to whom the warrant should be
    returned.        (The space on the form for the return date is followed
    by the parenthetical "not to exceed 10 days.")              Burgos argues that
    these        omissions   violate   Federal     Rule   of   Criminal    Procedure
    41(e)(2)(A) (2009), which required the warrant to "command the
    officer . . . to execute the warrant within a specified time not
    longer than 10 days" and to "return the warrant to the magistrate
    judge designated in the warrant," and that such violation mandates
    suppression.11
    In United States v. Bonner, 
    808 F.2d 864
    (1st Cir. 1986),
    we considered a different subdivision of Rule 41, one providing
    that officers must leave a copy of the warrant at the place to be
    searched. See Fed. R. Crim. P. 41(f)(1)(c).12 We held that because
    the subdivision is "ministerial," a violation does not require
    suppression        unless   the    defendant   can    demonstrate     prejudice.
    
    Bonner, 808 F.2d at 869
    .            Prejudice means being "subjected to a
    search that might not have occurred or would not have been so
    11
    In 2009, Congress amended Rule 41(e), increasing to 14 days
    the time to execute the warrant.
    12
    At the time Bonner was decided, the subdivision was numbered
    41(d).
    -26-
    abrasive" had the rules been followed.     
    Id. (internal quotation
    marks omitted).   Other circuits have held the same applies to all
    the prerequisites of Rule 41. See United States v. Schoenheit, 
    856 F.2d 74
    , 76-77 (8th Cir. 1988); United States v. Burke, 
    517 F.2d 377
    , 386-87 (2d Cir. 1975).
    We have little trouble concluding that the prejudicial
    error rule of Bonner should extend to the failure by the issuing
    magistrate to define the time period of the search when the form
    itself provides that the search is to be completed within the time
    frame specified by the rule, and to the failure to designate a
    magistrate to whom the form should be returned. "The exclusionary
    rule should be limited to those situations where its remedial
    objectives are best served, i.e., to deter illegal police conduct,
    not mistakes by judges and magistrates."   
    Bonner, 808 F.2d at 867
    (citing United States v. Leon, 
    468 U.S. 897
    , 908, 916 (1984)).
    Burgos does not suggest why he was prejudiced by the warrant's
    technical failings.   Absent a showing of prejudice, there is no
    basis for suppressing the evidence.13
    5.   Fruit Of The Poisonous Tree
    While serving as an informant, Semidey (against her
    handlers' instructions) took a number of documents--including some
    13
    The warrant was executed in compliance with the 10-day
    statutory maximum in effect at the time, and Burgos does not argue
    it was not.    The warrant was issued on December 29, 2005; the
    search of the farm took place on December 30 and 31, 2005, and the
    search of the car took place on January 5, 2006.
    -27-
    pertaining to the farm--from Burgos' residence.        The physical
    evidence of this unconstitutional search was suppressed.      Burgos
    now argues that any evidence from the farm should be suppressed as
    the fruit of the poisonous tree.       The district court denied the
    motion to suppress on the grounds that a search of the farm was
    inevitable.   See United States v. Scott, 
    270 F.3d 30
    , 42-45 (1st
    Cir. 2001) (explaining the inevitable discovery doctrine).        On
    appeal, Burgos argues in a single conclusory sentence that the
    government has not met its burden of proving by a preponderance of
    the evidence that the farm would have been discovered by lawful
    means.   He does not challenge the specific evidence from which the
    district court concluded that discovery was inevitable:          DEA
    agents' conversations with Semidey and Corales, as well as an
    instance where local police seized some stolen containers from the
    property.     This argument, even if not waived for perfunctory
    briefing, see United States v. Zannino, 
    895 F.2d 1
    , 16 (1st Cir.
    1990), fails in the face of the evidence found persuasive by the
    district court.
    C.   Juror Bias
    We now turn to Burgos' claim that the district court
    abused its discretion when it first failed to hold an evidentiary
    hearing to investigate allegations of juror bias, and then failed
    to grant a new trial on account of that alleged bias, all in
    violation of Burgos' Sixth Amendment right to a trial by impartial
    -28-
    jury.        U.S. Const. amend. VI.   This claim arises out of an incident
    during the sentencing phase of trial in which a juror appeared to
    slump in his chair when a man we will call Juan walked into the
    room.        Juan was married to one of the witnesses who testified for
    the defense in the penalty phase.             At the next break, Juan told
    defense counsel that he was a second cousin of the juror (their
    grandmothers were sisters).           Defense counsel told the judge that
    the juror was appearing to hide from Juan.
    The judge held an in camera meeting in which he asked the
    juror if he recognized anyone in the court room that day.              The
    juror said he had not recognized anyone "involved in the case," and
    stressed that if he recognized anyone, he would speak up.14            The
    district court asked several more times (e.g., "So far in the case,
    you haven't recognized anybody?").            To each question, the juror
    responded that he had not, and that "[i]f I . . . recognize
    somebody, I will tell the Court.         But I didn't."   He also explained
    that he slumped because he was uncomfortable, and that although he
    had grown up the part of Puerto Rico where the events at issue had
    taken place, he had moved away from his hometown more than two
    decades before, and rarely returned to visit. The court also asked
    specifically if he recognized the name "Juan," and the juror
    responded that he did not.
    14
    "I'm telling the truth, if in any case I would recognize
    anybody of the persons involved in the case, it would come from me
    to tell the Court . . . . I haven't."
    -29-
    Satisfied with the juror's credibility, the district
    court continued the penalty phase of the trial.        Based on this
    episode, Burgos filed a motion for acquittal or new trial and
    requested an evidentiary hearing.      His motion also raised the new
    argument that a defense witness from the guilt phase was also
    related to the juror (her father was the juror's mother's cousin).15
    The district court denied this motion on the grounds that the juror
    was credible when he said he didn't recognize anyone in the
    proceedings, and that moreover there hadn't been even a suggestion
    that he had recognized the witness during the guilt phase.     Burgos
    now appeals the denial of this motion.
    Burgos can hardly complain now that the district court
    failed to remove the juror.   After all, the only jury finding made
    after Burgos raised the issue favored Burgos by rejecting the death
    penalty.   So he must train his argument on a claim that the
    district court abused its discretion by failing to grant a new
    trial because of later-discovered bias relevant to the guilt phase.
    All Burgos has to go on is his belated complaint that a witness he
    himself had called was a distant cousin of the juror.     Because the
    district court took as credible the juror's statement that he did
    not recognize anyone in the proceedings, Burgos instead makes an
    argument based on implied bias:     that either the bare fact of a
    15
    In the motion, Burgos also raised a number of even more
    attenuated connections.
    -30-
    blood relationship, or the fact that the juror lied about the
    existence of a blood relationship, is sufficient to imply bias as
    a matter of law.       See Amirault v. Fair, 
    968 F.2d 1404
    , 1406 (1st
    Cir. 1992) (per curiam).
    Neither argument prevails.        First, the district court
    concluded that the juror did not lie about not recognizing anyone
    in the proceedings, and nothing suggests that finding was clearly
    erroneous.     See 
    id. at 1405
    (stating that a court's findings of
    juror credibility merit "great deference").           As for the bare fact
    that the juror and the witness were distant cousins, implied bias
    requires "exceptional" or "extreme" circumstances, 
    id. at 1406
    (quoting Smith v. Phillips, 
    455 U.S. 209
    , 222 (1982) (O'Connor, J.,
    concurring)), and we cannot conclude that the district court erred
    in finding the situation fell well short of this mark, given that
    the familial connections were so attenuated that no one during the
    guilt phase seems to have even noticed that the witness and the
    juror were distant cousins.
    Burgos' alternative argument challenges the procedure
    employed by the district court.         He says that the court erred by
    investigating    the    claim   of   juror   bias   through   an   in   camera
    discussion, rather than an evidentiary hearing.               The case law
    suggests otherwise.      While a district court must make an "adequate
    inquiry" into non-frivolous claims of juror bias or misconduct,
    United States v. Ortiz-Arrigoitia, 
    996 F.2d 436
    , 442 (1st Cir.
    -31-
    1993), the district court has "broad discretion to determine the
    type of investigation which must be mounted."               United States v.
    Boylan, 
    898 F.2d 230
    , 258 (1st Cir. 1990).            The court "may, but
    need not, convene a full-blown evidentiary hearing."                  
    Id. We review
    the district court's determination of how to investigate
    such claims for patent abuse of discretion.           
    Id. The district
    court certainly did not patently abuse that
    broad discretion here.     The relevant question is not whether the
    juror was actually related to anyone in the proceedings; it is
    whether such a relationship, if it exists, biased the juror against
    the defendant.    Indeed, the district court accepted that the juror
    may have been related to the witness, but it credited the juror's
    testimony that he did not recognize anyone, let alone harbor any
    bias against the defendant as a result of that unrecognized
    relationship with a witness for the defense.                 Thus, while an
    evidentiary hearing could conceivably have proven the relationships
    if they were at issue, they were not at issue.          The district court
    did not patently abuse its discretion.
    D.   Trial Before A Death-Qualified Jury
    Prior    to   trial,   Burgos   filed   a    number    of   motions
    challenging the government's decision to seek the death penalty.
    The district court denied them all.         Burgos was tried before a
    death-qualified jury, and sentenced to life in prison.                 He now
    argues that because he never should have faced the death penalty,
    -32-
    his   trial    before     a   death-qualified    jury    violated      his   Sixth
    Amendment rights.
    For his argument that he never should have faced the
    death penalty in the first place, Burgos simply incorporates by
    reference his pre-trial motions, offering no arguments for why the
    district court erred in dismissing those motions.                      Arguments
    incorporated into a brief solely by reference to district court
    filings are deemed waived.           See Exec. Leasing Corp. v. Banco
    Popular de P.R., 
    48 F.3d 66
    , 67-68 (1st Cir. 1995).                     As such,
    Burgos has waived his argument that the district court erred when
    it rejected his various motions to strike the death penalty.
    Given   a   proper   death     penalty    charge,   it    is    well
    established that using a death-qualified jury for the guilt phase
    does not violate a defendant's Sixth Amendment rights. Buchanan v.
    Kentucky, 
    483 U.S. 402
    , 414-16 (1987).           Here, Burgos faced charges
    of murdering Semidey to prevent her from, or in retaliation for,
    communicating with law enforcement in violation of 18 U.S.C.
    §§ 1512(a)(1)(A) and (C), and 1513(a)(1)(B), and the death penalty
    is available for these violations as a matter of law.                          
    Id. §§ 1111(b),
    1512(a)(3)(A), 1513(a)(2)(A).              Thus, there has been no
    Sixth Amendment violation.
    E.    Sufficiency Of The Evidence
    Burgos next appeals from the order denying his motion for
    acquittal or new trial on the basis of insufficient evidence to
    -33-
    convict.   This court reviews a denial of a Rule 29 motion for
    acquittal based on insufficiency of the evidence de novo, examining
    the evidence in the light most favorable to the verdict,    United
    States v. Troy, 
    583 F.3d 20
    , 24 (1st Cir. 2009), and asking whether
    a rational jury could find guilt beyond a reasonable doubt, United
    States v. Andujar, 
    49 F.3d 16
    , 20 (1st Cir. 1995).      A district
    court's denial of a motion for a new trial is reviewed for manifest
    abuse of discretion.   United States v. González-González, 
    136 F.3d 6
    , 12 (1st Cir. 1998).
    Burgos argues that the government presented insufficient
    evidence that he killed Semidey with the intent to prevent her
    attendance or testimony in an official proceeding, 18 U.S.C.
    § 1512(a)(1)(A), to "prevent a communication about the commission
    or possible commission of a federal offense to a federal law
    enforcement officer," 
    id. § 1512(a)(1)(C),
    or to "retaliate" for
    providing such information, 
    id. § 1513(a)(1)(B).
      As Burgos would
    have it, the evidence at worst established two equally plausible
    reasons for him to have killed Semidey:       he killed her in a
    domestic dispute because they had an argument three days before her
    disappearance that, according to trial testimony, did not seem to
    have anything to do with her being an informant,16 or he killed her
    16
    Semidey's mother testified that the fight began when Burgos
    said he wouldn't sell a kilogram of cocaine to a certain person and
    Semidey said she would have sold the drugs.        Her mother then
    responded affirmatively to defense counsel's characterizing the
    fight as being about the fact that Burgos didn't like that Semidey
    -34-
    because of her informing.           Alternatively, he says that it was
    equally plausible that another member of the conspiracy killed her.
    We    agree   with   the    district      court    that these other
    theories were not equally plausible. The jury heard testimony that
    Burgos tried several times to confirm whether or not Semidey was an
    informant,    that    he   concluded     that    she   was,    and   that   he   had
    threatened to kill her and "make her disappear from the face of the
    earth" if he ever found out that she was cooperating with the
    government.       The jury heard, too, evidence of Burgos' drug-related
    activities and Semidey's knowledge of those activities, providing
    him with ample motive to make sure she never testified against him.
    If Burgos was merely unhappy with his non-marital relationship, he
    had numerous options for ending that relationship.                     If he was
    unhappy   because      Semidey    was    a     government      informant    clearly
    possessed of knowledge sufficient to convict him, he had fewer
    reliable options available to him other than murder, or so the jury
    could reasonably have concluded.
    F.   Prejudicial Variance
    Burgos then argues that the evidence presented at trial
    regarding the duration of the drug conspiracy constituted a fatal
    was "acting like a drug dealer." Agent Iglesias also testified
    that Semidey told him that the fight had to do with Burgos'
    reluctance to sell drugs to a certain person.
    -35-
    variance from that charged in the indictment.17   Burgos was charged
    with one count of conspiracy to possess cocaine with intent to
    distribute, and one of conspiracy to import cocaine, both of which
    were charged to have extended from 1998 to 2005.      Burgos argues
    that because the only evidence of the conspiracy in the 1998-99
    time frame came from Corales, who was in prison for six months
    starting in 2001, and who also testified as a witness for the
    government in an unrelated murder case, there could not have been
    a continuous 1998-2005 conspiracy to import and distribute cocaine.
    He argues that at best, the government has presented evidence of
    two distinct conspiracies (a distribution conspiracy in 1998-99,
    and a conspiracy to import and distribute in 2004-0518), creating
    a fatal variance from the 1998-2005 conspiracy charged in the
    indictment.
    To determine whether a variance exists, we "review the
    record to determine whether the evidence and reasonable inferences
    therefrom, taken as a whole and in the light most favorable to the
    prosecution, would allow a rational jury to determine beyond a
    17
    Burgos preserved this objection below through a mistrial
    motion that the district court denied in open court.
    18
    Burgos' view of the events could arguably be characterized
    as three or four conspiracies:          separate importation and
    distribution conspiracies in both 2004-05 and 1998-99, although as
    we discuss below, he argues that there was no evidence of an
    importation conspiracy in 1998-99. However, because his primary
    complaint turns on two distinct periods of time, we follow his lead
    in referring to only "two" conspiracies.
    -36-
    reasonable doubt that a single conspiracy existed."           United States
    v. Mangual-Santiago, 
    562 F.3d 411
    , 421 (1st Cir. 2009) (internal
    quotation marks omitted).       "Although conflicting inferences may
    arise, so long as the evidence is adequate to permit a reasonable
    trier of fact to have found a single conspiracy beyond a reasonable
    doubt, the jury's finding will not be disturbed on appeal."              
    Id. Even if
    we find a variance, it "does not warrant reversal unless it
    is prejudicial."   United States v. Yelaun, 
    541 F.3d 415
    , 419 (1st
    Cir. 2008).   We review de novo the question of whether a variance
    was prejudicial.       United States v. Wihbey, 
    75 F.3d 761
    , 774 (1st
    Cir. 1996).
    The record contains sufficient evidence to support the
    jury's finding that Burgos participated in a conspiracy from 1998
    to 2005.   Corales testified that he met Burgos in 1998.            At the
    time, both had their own drug points and were involved in unrelated
    drug activities, although they knew people in common.           After their
    meeting, he and Burgos began selling each other kilogram-quantities
    of cocaine.   Corales went to jail, but only for six months in 2001,
    during which time the two remained in contact (for example, Burgos
    provided the ice cream for an inmate party Corales organized), and
    when   Corales   was    released,   Burgos   gave   him   a   job   in   his
    construction company.        Sometime around 2003 or 2004, the two
    developed the plan to import drugs from the Dominican Republic,
    which only got as far as stealing a boat.           When the government
    -37-
    asked whether the exchange of drugs between Corales and Burgos
    lasted throughout their seven-year relationship (meaning 1998 to
    2005), Corales answered in the affirmative.19
    The government presented no evidence that other people
    were involved in the conspiracy with Corales and Burgos until they
    began planning to import drugs sometime around 2003 or 2004.
    Thus, there is no evidence of a 1998-2005 conspiracy unless Corales
    remained a member for the entire time.      Burgos argues that the gap
    in the government's evidence and the bare fact that Corales went to
    prison means that the conspiracy ended in 1999 and re-started
    several years later.        A six-month hiatus, however, does not
    necessarily mean the conspiracy ended.           See United States v.
    Alejandro-Montañez, 
    778 F.3d 352
    , 359-60 (1st Cir. 2015). Nor does
    the   imprisonment   of   conspiracy   members   necessarily   require   a
    finding of withdrawal or abandonment.       See 
    Mangual-Santiago, 562 F.3d at 422-23
    .
    Burgos points to two additional points that could suggest
    Corales withdrew from the conspiracy: the fact that he gave up his
    19
    The exchange followed a discussion in which Corales was
    unable to estimate how many kilograms of cocaine had changed hands
    between him and Burgos during their relationship. It consists of:
    Q: Well, is it fair to say that this relationship
    went on for close to seven years?
    A: Yes.
    Q:   And throughout that time period, were there
    exchanges of drugs, either from you to him or from him to
    you in kilo quantities of cocaine?
    A: Yes.
    -38-
    own drug points; and the fact that in 1999 he agreed to testify for
    the government in unrelated cases.           (Although defense counsel
    pushed Corales to admit he was "working for" or an "informant" for
    the government, Corales insisted that all he agreed to do was show
    up in court and testify.)     On balance, though, while the evidence
    could have allowed the jury to infer that Corales withdrew from the
    conspiracy with Burgos and began a new conspiracy with Burgos out
    of the blue around 2003, it is also sufficient to support an
    inference that Corales never withdrew from the original conspiracy.
    Thus, there is no variance.
    G.   Evidentiary Rulings
    Finally, Burgos challenges a number of the district
    court's   evidentiary    rulings,   both   individually    and   for   their
    cumulative impact.       As a general matter, this circuit reviews
    evidentiary rulings for abuse of discretion.              Baker v. Dalkon
    Shield Claimants Trust, 
    156 F.3d 248
    , 251-52 (1st Cir. 1998).
    However, if the evidentiary ruling rests on an interpretation of
    law, we review it de novo, with subsidiary fact-finding reviewed
    for clear error.   
    Id. Even if
    a district court errs, such error does not
    require reversal if it was harmless--i.e., if it can be said that
    "'the judgment was not substantially swayed by the error.'" United
    States v. Meserve, 
    271 F.3d 314
    , 329 (1st Cir. 2001) (quoting
    Kotteakos v. United States, 
    328 U.S. 750
    , 765 (1946)).                   The
    -39-
    government generally bears the burden of persuasion on whether an
    error was harmless, although an appellate court may also consider
    sua sponte whether an error was harmless.         United States v. Rose,
    
    104 F.3d 1408
    , 1414-15 (1st Cir. 1997) (holding that a court may
    hold that an error was harmless even if the government does not
    make that argument, because of the seemingly mandatory text of Fed.
    R. Crim. P. 52(a) and the policy interest in conserving judicial
    resources).
    For claims that an evidentiary ruling violated the Sixth
    Amendment's Confrontation Clause, the error must be harmless beyond
    a reasonable doubt.     United States v. Cameron, 
    699 F.3d 621
    , 652
    (1st Cir. 2012).    Cumulative errors may merit a reversal if they
    achieve a "critical mass" that "cast[s] a shadow upon the integrity
    of the verdict."    United States     v. Sepulveda, 
    15 F.3d 1161
    , 1196
    (1st Cir. 1993).
    1.    Semidey's Hearsay Statements
    Burgos argues that the district court erred in admitting
    Semidey's statements under the "forfeiture by wrongdoing" exception
    to the rule against hearsay.         Fed. R. Evid. 804(b)(6).           That
    exception allows the admission of hearsay statements "against a
    party that wrongfully caused--or acquiesced in wrongfully causing--
    the declarant's unavailability as a witness, and did so intending
    that result."     
    Id. We review
    for clear error the question of
    whether   the   government   has   demonstrated   that   Burgos   had    the
    -40-
    requisite intent for this exception to apply.    See 
    Baker, 156 F.3d at 252
    ; see also United States v. Scott, 
    284 F.3d 758
    , 762 (7th
    Cir. 2002) (question of whether Rule 804(b)(6) applies turns on
    fact-finding).    This circuit has not defined the standard of
    evidence necessary to establish the requisite intent, although for
    the closely analogous claim that a defendant has waived his Sixth
    Amendment right to confront a potential witness by murdering that
    witness, this circuit requires the government to prove waiver by a
    preponderance of the evidence, see United States v. Houlihan, 
    92 F.3d 1271
    , 1280 (1st Cir. 1996), and the majority of circuits seem
    to apply this standard to Rule 804(b)(6), see Davis v. Washington,
    
    547 U.S. 813
    , 833 (2006).   We do the same here.
    Our finding that the evidence was sufficient to convict
    Burgos of murdering Semidey to make sure she did not share further
    her knowledge of his criminal activity readily disposes of this
    evidentiary challenge.   The only wrinkle Burgos seeks to introduce
    is a claim that, for purposes of Rule 804(b)(6), the prosecution
    must prove that charges had been filed at the time he killed
    Semidey.    This circuit has previously held that the analogous
    exception to the Confrontation Clause applies to the murder of
    witnesses in criminal investigations even before charges have been
    brought.   
    Houlihan, 92 F.3d at 1280
    .   The reasoning of that case is
    just as applicable here, as the rule that Burgos advocates would
    simply create an incentive to "murder suspected [witnesses] sooner
    -41-
    rather than later."           
    Id. Thus, the
    forfeiture-by-wrongdoing
    exception is available for statements by a witness who was murdered
    before charges were brought if it was "reasonably foreseeable that
    the investigation [would] culminate in the bringing of charges."
    
    Id. Here, the
    district court did not clearly err in concluding
    that Burgos intended to prevent Semidey from testifying at a trial
    that, had she continued working with the government, was reasonably
    foreseeable to occur.
    Burgos' attempt to rely on Giles v. California, 
    554 U.S. 353
    (2008) is misplaced.            That case merely established that
    Rule 804(b)(6) and the analogous Confrontation Clause provision do
    not   apply    without   an   intent    to    prevent   testimony--i.e.,   the
    exception is not available for statements by murder victims simply
    because the defendant made them unavailable.              
    Giles, 554 U.S. at 367-77
    .    It did not announce a rule that the murder must actually
    follow the filing of charges.
    2.      Hearsay References To Burgos Being Under Investigation
    At trial, Burgos pursued lines of attack that made
    relevant whether law enforcement had a preexisting investigation of
    or interest in Burgos prior to Semidey becoming an informant.                A
    DEA supervisor therefore testified that he already knew Burgos as
    a person of interest before Semidey came into his office.                  Two
    other agents so agreed. None of the witnesses testified about what
    -42-
    it was that caused the agents to initially become suspicious of
    Burgos.
    Burgos   now   claims   that   all   of   this   was   somehow
    inadmissable hearsay.       We think not.    Having placed at issue the
    chronology of the investigation, Burgos can hardly complain that
    the government put on direct witnesses who could say when they
    started looking at Burgos.      The fact that such testimony may have
    implied that other persons told the agents something that caused
    them to focus on Burgos hardly causes their first-hand, relevant
    testimony concerning the investigation's status to become hearsay.
    None of them even related the substance of what unnamed others may
    have said, let alone offered it for its truth.20        See Fed. R. Evid.
    801(c)(2).
    3.      Daubert Challenge To Testimony Of Dog Handlers
    At trial, the government introduced the testimony of
    several law enforcement officers that one of two so-called "cadaver
    dogs" "alerted" when led by an area on Burgos' property where one
    of the officers had identified a possible grave site approximately
    six months before.     Because no human remains were discovered, the
    sole purpose of this testimony was to suggest that, because the dog
    alerted, the jury could conclude that the location had, at one
    point, concealed a human cadaver.
    20
    Semidey's husband's testimony that he had heard of the
    investigation from the supervisor, even if it was hearsay, was
    harmless because it was cumulative of the admissible testimony.
    -43-
    Burgos objected to this testimony on several grounds, in
    particular that the testimony constituted, under Federal Rule of
    Evidence 702, an expert opinion that the cadaver dog could reliably
    locate a spot in which human remains had been buried, and that the
    government had failed to lay a proper basis for its reliability
    under Daubert v. Merrell Dow Pharmaceuticals, Inc., 
    509 U.S. 579
    (1993). The district court nevertheless allowed the testimony, and
    Burgos now challenges that ruling on appeal.
    Upon reviewing the record, we tend to agree with Burgos
    that the government did not lay out much of a case that a dog could
    reliably identify a spot in which there had been (presumably months
    earlier) a human cadaver, as opposed to simply responding to animal
    remains or to the leash-holding handler's conscious or unconscious
    cues.   It is one thing to use a dog to identify a place in which
    one might look to see if human remains are present.    It is quite
    another to use a dog to identify dirt that was once exposed to a
    human cadaver.   The prosecution witnesses offered virtually no
    evidence that the scientific reliability of such a use had been
    established, or that their investigation protocols were generally
    accepted for such a use.   Burgos' experts, in turn, provided easy-
    to-follow testimony explaining numerous basic defects in the use of
    the dogs for the purpose for which they were used here.   They also
    offered much common sense, noting, for example, that the officer
    -44-
    using the dog on a leash that alerted was the officer who had
    previously identified the suspected spot.
    Ultimately, however, we need not determine whether the
    admission of the testimony was an abuse of discretion because it is
    plain that, for two reasons, any possible error was harmless.
    First, the government presented a large amount of much more
    compelling circumstantial evidence that Burgos was responsible for
    Semidey's death.   That evidence included testimony from Semidey's
    brother-in-law that Burgos had repeatedly tried to confirm, and
    then said he had confirmed, a rumor that Semidey was an informant;
    testimony from Semidey's handlers that Semidey told them that
    Burgos had threatened to make her disappear if he found out she was
    working for the government; testimony from another witness that
    Burgos had threatened to kill that witness if he told anyone that
    Burgos knew that Semidey was an informant; testimony by Corales
    that after Burgos learned that Semidey was an informant, Burgos had
    asked Corales for a gun and said that Semidey was going to
    disappear; and testimony that Semidey was last seen in Burgos' car.
    The jury heard the recorded conversation between Corales and Burgos
    in which Burgos said that Semidey would not be found.    They also
    heard testimony that Burgos had choked Semidey during a fight,
    which--even if the fight did not have to do with Semidey being an
    informant--demonstrated (assuming the jury found it credible) that
    -45-
    Burgos was capable of violence.            Finally, trace DNA evidence was
    found in the trunk of Burgos' car.
    It is no doubt true that Burgos offered evidence to the
    contrary.    Among other things, Burgos pointed out a number of
    inconsistencies in the testimony of the DEA agents investigating
    him; established that Corales' credibility is, to put it mildly,
    questionable; and offered evidence that the suspicious car-washing
    and the DNA evidence recovered from the trunk may have had innocent
    explanations.      On balance, though, we conclude that the evidence
    other than the dog alert, while circumstantial, pointed quite
    forcefully at Burgos.
    Our    second   reason   for    this   conclusion    is   that   the
    testimony about the dog alert carried very little incremental
    probative force because its limitations would be almost certainly
    apparent to any reasonable jury.            Even though the dog handlers'
    testimony    was    "scientific,     technical,     or   other    specialized
    knowledge," see Fed. R. Evid. 702, it was at the non-technical end
    of the spectrum.      Indeed, the prosecution did not even propose it
    as expert testimony, and the witnesses offered no technical or
    jargon-laden support for their claims.             The defense exposed the
    limitations in the handlers' claims through easy-to-follow cross-
    examination and persuasive testimony from an expert clearly more
    knowledgeable on the matter than the officers.                  We expect the
    jurors were well able to understand and evaluate these types of
    -46-
    arguments that a dog may not be able to distinguish soil that once
    contained a decomposed human from soil that once contained a
    decomposed animal, or that a handler walking the dog on a leash
    might cause the dog to alert.     In short, the testimony about the
    alert of a cadaver dog that found no cadaver added little to the
    case.
    This is not to say that the district court does not have
    a responsibility to exercise its gatekeeper role under Rule 702
    with regard to such testimony.    Indeed, in other contexts in which
    the government seeks to offer dog alerts as substantive evidence
    (for example, of the presence of an accelerant in an arson case),
    courts routinely test the reliability of such testimony under
    Daubert. See, e.g., United States v. Marji, 
    158 F.3d 60
    , 62-63 (2d
    Cir. 1998) (per curiam).      It is, rather, to say that failure to
    conduct such an analysis, assuming it is error, is more likely to
    be harmless in a case such as this, in which the prosecution
    witnesses cited no studies or reports to buttress their experience-
    based observations, nor claimed any special scientific expertise,
    and in which the defense gave the jury ample evidence from which to
    judge for themselves whether a cadaver dog alert that revealed no
    cadaver was anything more than a false alert.
    4.   Prior Bad Acts
    At trial, the government introduced as evidence a number
    of recordings that Semidey had made of conversations with Burgos.
    -47-
    One of those recordings reveals Burgos' involvement with drug
    trafficking in a time frame that supports the prosecution's claim
    that Burgos had been involved in such activity for a long time.           A
    portion of that recording also includes a statement that, as part
    of that drug trafficking conspiracy, he had served as a lookout for
    a murder.
    Burgos objected to the evidence on two grounds: (1) that
    the government failed to comply with Fed. R. Evid. 404(b)(2), which
    requires that, upon request, the government must give notice of the
    evidence of prior bad acts that it seeks to offer; and (2) that the
    evidence was in any event inadmissible as propensity evidence
    prohibited by Fed. R. Evid. 404(b). The district court allowed the
    recording to be played, but also instructed the jury that the
    statements about the murder may be false and should be ignored.21
    We begin with the notice issue.         The wrinkle in Burgos'
    argument is that the government had provided the recordings to
    defense several years before trial.           What it did not do was
    specifically   call   attention   to   the   fact    that   they   contained
    Rule 404(b) material, even though the defense sent an e-mail
    21
    The district court instructed the jury as follows: "These
    statements by Mr. Burgos are uncorroborated and, as I mentioned to
    you before lunch, for all we know he may have been huffing and
    puffing to impress his girlfriend. Okay? You must not consider
    the statements regarding those incidents for the truth of those
    events. In other words, you must not take those things as proof
    that the events actually occurred or that Mr. Burgos was in any way
    involved in them, neither may you hold them against Mr. Burgos in
    any other manner."
    -48-
    specifically requesting such information.    We do not reject the
    distinct possibility that a large bulk production may well be,
    without more, deficient notice.       However, we need not decide
    whether it is so here, because even if the notice was deficient,
    the error was harmless.
    Burgos makes no argument at all that the lack of clear
    notice caused him any prejudice at all.   Indeed, he does not even
    argue that his counsel did not know beforehand that the government
    would seek to play the recordings. We also have not identified for
    ourselves any way that the defense strategy was hampered by lack of
    specific notice, and therefore conclude that the lack of specific
    notice was harmless.22
    That leaves the question of whether the evidence was
    admissible on its merits.   On that question, Burgos argues both
    that the district court erred in determining the evidence to be
    admissible as offered for something other than propensity, and that
    the admission of the evidence was not harmless. On the question of
    admissibility, our review is for abuse of discretion.       United
    States v. Rivera-Rivera, 
    477 F.3d 17
    , 20 (1st Cir. 2007).
    22
    Burgos offers two cases that he argues stand for the
    proposition that the failure to provide notice of Rule 404(b)
    evidence cannot be harmless. Both involve surprise testimony that
    hampered the defense strategy in identifiable ways. United States
    v. Carrasco, 
    381 F.3d 1237
    , 1240-41 (11th Cir. 2004) (undermining
    a defense based on a lack of intent); United States v. Vega, 
    188 F.3d 1150
    , 1155 (9th Cir. 1999) (surprise witness prevented defense
    from preparing for cross-examination on the prior acts).
    -49-
    We   cannot   find   that    the    district   court   abused   its
    discretion in allowing the recording as evidence relevant to an
    issue other than propensity.      Although the government offered the
    recording for purposes of dating the conspiracy, the district court
    also stated that it was admissible as evidence of "motive" or
    "opportunity." The recording confirms in Burgos' own voice that he
    told Semidey things to which he would certainly not want her to
    testify.   That fact was relevant to his motive to kill her.            And it
    also corroborated her general claim that he confided in her in that
    matter.    To the extent that the evidence might nevertheless have
    been excluded as unfairly prejudicial under Rule 403, given that
    the government had presented other evidence of Burgos' motive, the
    trial court's limiting instruction to the jury tilted the balance
    enough to trigger our deference to such a balancing.
    5.    Cell Phone Records
    Semidey   owned      and     used     a   cell    phone.        Her
    telecommunications carrier was a company named Centennial, which
    has since been acquired by AT&T Puerto Rico. In the regular course
    of its business, Centennial maintained in its computer files data
    for each call made by each user, including Semidey.                   The data
    included the phone numbers dialed on Semidey's phone or from which
    it received calls; the dates, times, and durations of the calls;
    whether each call was incoming or outgoing; and the particular cell
    tower that connected the phone to the network during the call.
    -50-
    During trial, the government introduced as an exhibit a
    print-out    of       Centennial's   data      concerning   Semidey's   phone's
    activity on various dates. The government also introduced a record
    maintained by Centennial showing the locations of its cell towers,
    including those cell towers to which its records show Semidey's
    phone connected on the pertinent dates.             Centennial's records were
    accompanied by a certification of the custody of Centennial's
    records in compliance with Fed. R. Evid. 803(6)(D) and 902(11).
    The government also presented testimony from a Centennial employee
    describing Centennial's record-keeping practices and explaining the
    data in the actual exhibits.            The employee who testified was not
    the same employee who had queried Centennial's database to compile
    the print-out used at trial.
    Burgos raised below (in connection with a motion in
    limine and a voir dire examination of the Centennial witness) and
    now presses on appeal three objections to the cell phone records.
    First, Burgos contends that because the print-out of
    Semidey's phone records "was a highly specific document prepared
    pursuant    to    a    request   from   law    enforcement,   containing   only
    information requested by the agency," it did not qualify as an
    exception to the hearsay rule under Fed. R. Evid. 803(6)(B) and
    (D).   That exception applies to documents "kept in the course of a
    regularly conducted activity of a business," and for which "making
    the record was a regular practice of that activity."              
    Id. Burgos -51-
    devotes one sentence to this contention in a 127-page brief and
    cites no precedent.
    Burgos' complaint about the Centennial exhibits could
    apply to virtually any print-out of data stored in computerized
    business records.    This circuit has previously held that exhibits
    showing selected data pulled from records that a company keeps in
    the ordinary course of business fall under the business records
    exception, even if the physical exhibits themselves were made to
    comply with a request from law enforcement.       United States v.
    Cameron, 
    699 F.3d 621
    , 641-42 (1st Cir. 2012) (holding that
    exhibits showing internet providers' records of when the defendant
    logged in and out of his account and the IP address from which he
    had logged in fell into the business records exception even though
    the exhibits themselves were created in response to a search
    warrant).    Other circuits have directly held that phone records
    fall into the business records exception. See, e.g., United States
    v. Yeley-Davis, 
    632 F.3d 673
    , 678-79 (10th Cir. 2011);       United
    States v. Green, 396 F. App'x. 573, 575 (11th Cir. 2010) (per
    curiam).    We see no reason to disagree here.
    Burgos argues, second, that the admission of the records
    "failed the Confrontation Clause standard set in Melendez-Diaz v.
    Massachusetts, 
    557 U.S. 305
    , 325 (2009)."    Why this is so, Burgos
    does not explain.      Melendez-Diaz held that business records,
    although not usually testimonial for purposes of triggering the
    -52-
    Confrontation Clause, may be testimonial if the regularly conducted
    business activity is the creation of evidence for trial, such as
    analyzing substances at a forensic lab.      See 
    id. at 321-24.
      In
    this case, however, the exhibits contained no data or analysis
    created for trial.    Rather, they were simply print-outs of data
    created and stored by Centennial in the course of running a phone
    company.
    Again, Cameron is instructive.    There, even though the
    court concluded that records the company made in the regular course
    of providing internet service were not testimonial for purposes of
    triggering the Confrontation Clause, it held that records of the
    company's reports to a child pornography tip line were.           It
    reasoned that even though company employees made such reports as
    part of the regular course of business, the purpose of reviewing
    and reporting suspected child pornography was to facilitate law
    enforcement.23   
    Id. at 647-48.
       "[T]o create each Report, someone
    at Yahoo! analyzed Yahoo!'s data, drew conclusions from that data,
    and then made an entirely new statement [the tip line Report]
    reflecting those conclusions. . . . This means that someone at
    Yahoo! analyzed Yahoo!'s business records and concluded that (1) a
    crime had likely been committed and (2) a particular user likely
    committed that crime."   
    Id. 23 Because
    the records triggered the Confrontation Clause, the
    court did not analyze whether they satisfied the business records
    exception.
    -53-
    Here, Centennial responded to a request for data that it
    had   previously    gathered    and   maintained   for   its   own   business
    purposes.     The fact that the print-out of this data in this
    particular format was requested for the litigation does not turn
    the data contained in the print-out into information created for
    litigation.      Rather, the physical manner in which the exhibit was
    generated simply reflects the fact that the business records were
    electronic, and hence their production required some choice and
    offered   some    flexibility   in    printing   out   only    the   requested
    information. See, e.g., 
    Yeley-Davis, 632 F.3d at 678-79
    .
    Third, Burgos challenges a statement by the Centennial
    witness that Semidey's phone was "in or around" the cell tower
    listed as connecting the phone during a call. She then expanded on
    this statement by responding in the affirmative when the government
    asked whether the cell tower that connected the call "was closest
    to the cell phone being used" when the call was initiated.             Burgos
    argues that the witness was not qualified under Fed. R. Evid. 702
    to offer testimony on the technical matter of how cell phone calls
    are routed through a company's towers.             It does seem that the
    witness's responses exceeded her knowledge--nothing on the exhibit
    indicated that the connecting cell tower was always the closest
    cell tower, and the witness explained on voir dire that she did not
    have the knowledge or expertise to opine that the connecting cell
    tower was actually closer than any other cell tower.
    -54-
    However, we conclude that the witness's gloss was of no
    apparent material affect.    The prosecution used the evidence to
    argue that Semidey must not have had her phone on July 2, shortly
    before she disappeared: testimony established that at around eight
    o'clock in the morning she was in Guánica, but the connecting tower
    for a call received at 7:50 a.m. was in Levittown, more than sixty
    miles away on the other side of the island.       (This, in turn, lent
    indirect support to testimony by Semidey's brother-in-law that
    Burgos said that he had confirmed Semidey was an informant because
    he had her phone, and had seen that she had used it to call the
    DEA.) Whether or not a phone necessarily connects to the "closest"
    tower, any juror could have easily concluded that a cell phone
    would not be sixty miles away from its connecting tower.            The
    custodian's assertion that the connecting tower is the one closest
    to the phone was of no significance at all in that context.
    Moreover, it is not even clear who the records helped
    most.    Burgos'   counsel   chose   to   avoid   cross-examining   the
    Centennial witness in front of the jury, and then used the exhibits
    in closing to make several exculpatory points, one of which
    involved the location of the phone.       While this approach did not
    waive Burgos' objection to the exhibits, it does support our
    conclusion that the Centennial witness's opinion about which tower
    a phone connects to did not do real damage to Burgos' defense, and
    may even have helped it.
    -55-
    6.     Bolstering DNA Evidence With Hearsay
    At trial, the government introduced DNA evidence that
    traces of Semidey's blood were found in Burgos' car. Burgos raised
    a   number   of   concerns   about   the    analyst's   methodology.   The
    government was allowed to elicit testimony that the department
    protocol was to have each analyst's work reviewed by a second
    analyst, and if they disagreed, then a third analyst was called.
    It also elicited testimony that a third analyst was not called in
    this case.    Burgos argues that this constitutes de facto testimony
    by the second analyst that he was in agreement with the first.
    Burgos argues that this violates the Confrontation Clause under
    
    Melendez-Diaz, 557 U.S. at 310-11
    , because Burgos was unable to
    cross-examine the second analyst.
    Burgos points to no case prohibiting the introduction of
    testimony that internal review protocols had been followed unless
    the reviewer is available to testify.           We again have difficulty
    identifying this non-statement as hearsay, and also note that such
    a rule would create a disincentive to this sort of internal control
    mechanisms in forensic investigations.            As such, we decline to
    announce such a rule, and hold that if there was error, any error
    was harmless beyond a reasonable doubt because Burgos had ample
    opportunity to cross-examine the primary analyst.
    Because we have disposed of several issues on harmless
    error grounds, we have also considered whether all such possible
    -56-
    errors   cumulatively were harmless.   We find that they were, given
    how tangential the challenged evidence in question was, as compared
    to the strong body of plainly admissible evidence supporting the
    verdict.
    III. Conclusion
    For the reasons stated above, we affirm.
    -57-