United States v. Ducoudray-Acevedo , 882 F.3d 251 ( 2018 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 16-2247
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    FEDERICO DUCOUDRAY ACEVEDO,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF PUERTO RICO
    [Hon. Aida M. Delgado-Colón, U.S. District Judge]
    Before
    Barron, Selya, and Lipez,
    Circuit Judges.
    Linda Backiel on brief for appellant.
    Rosa Emilia Rodríguez-Vélez, United States Attorney, Mariana
    E. Bauzá-Almonte, Assistant United States Attorney, Chief,
    Appellate Division, and Thomas F. Klumper, Assistant United States
    Attorney, Senior Appellate Counsel, on brief for appellee.
    February 14, 2018
    BARRON,      Circuit    Judge.    Federico      Ducoudray     Acevedo
    ("Ducoudray"), formerly an attorney in Puerto Rico, appeals his
    convictions for tampering with a witness, victim, or an informant,
    
    18 U.S.C. § 1512
    (b)(1), and for obstructing the due administration
    of justice, 
    18 U.S.C. § 1503
    . These convictions arise from a visit
    that Ducoudray made in August of 2012 to an alleged co-conspirator
    of one of Ducoudray's clients, who at the time was facing several
    criminal charges in both state and federal court. The government
    alleged   that   Ducoudray   committed       the   underlying      offenses    by,
    during that visit, requesting that the co-conspirator "retract"
    the statements that he made to law enforcement that implicated
    Ducoudray's client.
    On    appeal,   Ducoudray       contends     that    there   was    not
    sufficient evidence to support the convictions.                He argues, in the
    alternative, that a series of errors occurred at his trial that,
    he   contends,   show    either    singly    or    in   combination     that   the
    convictions may not stand.         We affirm both convictions.
    I.
    We reserve a discussion of the full set of facts,
    complicated as they are, for our discussion of the individual
    issues Ducoudray raises.          For now, it suffices to recount those
    facts that make it possible to understand the charges underlying
    the convictions.
    - 2 -
    The relevant sequence of events begins on July 21, 2012.
    A federal criminal complaint was filed that day in the United
    States District Court for the District of Puerto Rico against Edwin
    Santana Hernández ("Hernández"), a client of Ducoudray.                          The
    complaint charged Hernández with being a participant in a drug
    trafficking conspiracy.
    The complaint included a probable cause affidavit.                       The
    affidavit stated that Hernández's cousin, Julio Santana Castillo
    ("Castillo"),    had    already     been   arrested      in   New   York        as    a
    participant in the same drug trafficking conspiracy in which
    Hernández was implicated.         The affidavit also stated that Castillo
    was cooperating with federal law enforcement by providing law
    enforcement   with     evidence    of   Hernández's   involvement          in   that
    conspiracy.
    Hernández was arrested on the same day that the federal
    criminal    complaint    was   filed    against   him.        Two   days    later,
    Ducoudray provided a "notice of appearance" in that federal case
    indicating that he had been retained to serve as Hernández's
    attorney.
    The next day, Castillo, who was being held at the time
    in a correctional facility in New York City on a New York state
    law charge of conspiracy to traffic narcotics, hired a defense
    attorney named Peter Frankel ("Frankel") to represent him.                      Over
    the course of the next week, Frankel met with Castillo in the
    - 3 -
    correctional     facility,   appeared     in   state   court   on   Castillo's
    behalf in connection with the conspiracy charges that had been
    brought against Castillo, and was present at a proffer session
    with state and federal authorities during which Castillo confessed
    to his participation in the drug trafficking conspiracy.
    Soon thereafter, on August 1, 2012, a grand jury in the
    United States District Court for the District of Puerto Rico
    indicted both Hernández and Castillo, as co-defendants.                    The
    indictment charged them with various counts related to the drug
    trafficking    conspiracy    in   which    they    were   alleged     to   have
    participated.1
    The next key events for present purposes were as follows.
    On the same day that the federal indictment of Hernández and
    Castillo came down, August 1, 2012, Ducoudray left Puerto Rico and
    headed to New York City in hopes of visiting with Castillo at the
    correctional facility where Castillo was being held.                Then, the
    next day, according to Castillo's testimony at Ducoudray's trial,
    Ducoudray met with Castillo at the correctional facility and told
    him that he should "retract [the] story" that he had told to law
    enforcement, as "Hernández was going to trial, and [Castillo's
    1 This indictment was docketed as a different matter than the
    matter in which the federal criminal complaint had previously been
    filed against Hernández, although the case previously filed
    against Hernández was merged into the newly docketed case on August
    1, 2012.
    - 4 -
    retraction] was the only way [Hernández] was going to beat [his]
    case."    In addition, Castillo testified, Ducoudray first told
    Castillo that he had called Castillo's lawyer several times and
    that Castillo's lawyer never picked up.          But, Castillo testified,
    Ducoudray later in the conversation "changed the story" to say
    that Castillo's lawyer had, in fact, given Ducoudray permission to
    speak with Castillo.
    Ducoudray ended the meeting, according to Castillo's
    testimony, by telling Castillo that he should not tell his brother
    or his attorney about the meeting.         But, Castillo testified, after
    the visit Castillo feared for his safety and told his brother about
    the visit.
    Soon after meeting with Castillo, moreover, Ducoudray
    contacted Frankel, according to Frankel's testimony at Ducoudray's
    trial.   Frankel testified that, when the two men talked, Ducoudray
    identified    himself   as   Hernández's    attorney   and    asked    Frankel
    whether Castillo was cooperating with law enforcement but that
    Ducoudray did not reveal that he was in New York City or that he
    had just visited Castillo.       Frankel also testified that, after he
    later learned from Castillo's brother that there had been an
    unauthorized    visit   by   a   lawyer    to   Castillo,    Frankel    called
    Ducoudray.    According to Frankel's testimony, Ducoudray initially
    denied that the visit had occurred, stating that he was in Puerto
    Rico, but, when pressed by Frankel, admitted that he had visited
    - 5 -
    and spoken with Castillo, though he stated it was only to "find
    out who [Castillo's] lawyer was."
    The next morning, Frankel testified, he contacted the
    Assistant United States Attorney ("AUSA") prosecuting Hernández's
    case and reported the incident to that AUSA, both orally and later
    by email.   The email included an account of what Castillo had told
    Frankel about what Ducoudray had said to Castillo during their
    meeting at the correctional facility.
    In 2015, Ducoudray was indicted on federal charges of
    obstructing the due administration of justice2 and tampering with
    a witness, victim, or an informant,3 in connection with his visit
    to Castillo.    A jury trial was held in January 2016, after which
    Ducoudray was convicted of both offenses.4   He now appeals.
    2  "Whoever corruptly, . . . impedes, or endeavors to
    influence, obstruct, or impede, the due administration of justice,
    shall be punished . . . ." 
    18 U.S.C. § 1503
    .
    3 "Whoever knowingly . . . corruptly persuades another person,
    or attempts to do so, . . . with intent to . . . influence, delay,
    or prevent the testimony of any person in an official proceeding
    . . . shall be fined under this title or imprisoned . . . ." 
    18 U.S.C. § 1512
    (b).
    4 Prior to trial, in October 2012, Castillo and Hernández
    entered into plea agreements with respect to the federal drug
    charges against them.    They were both sentenced in 2013, with
    Castillo receiving a reduced sentence recommendation due to his
    cooperation with law enforcement.
    - 6 -
    II.
    We   first     address   Ducoudray's       contention      that     the
    District       Court   wrongly    denied   his    motion    for   a     judgment    of
    acquittal pursuant to Federal Rule of Criminal Procedure 29, as to
    both charges.5         To succeed on his Rule 29 motion, Ducoudray must
    show that the evidence presented at trial, even when viewed in the
    light most favorable to the government, did not suffice to prove
    the elements of the offenses beyond a reasonable doubt. See United
    States v. Gabriele, 
    63 F.3d 61
    , 67 (1st Cir. 1995).
    In order to convict Ducoudray of a violation of 
    18 U.S.C. § 1512
    (b)(1), the government had to prove beyond a reasonable doubt
    that       Ducoudray   "(i)   knowingly    (ii)   . . .    corruptly      persuaded
    [Castillo], or attempted to do so . . . (iii) with intent to
    influence[, delay, or prevent the] testimony [of Castillo] (iv) in
    an official proceeding."           United States v. Cruzado-Laureano, 
    404 F.3d 470
    , 487 (1st. Cir. 2005). We have previously held, moreover,
    that "[t]rying to persuade a witness to give false testimony counts
    as 'corruptly persuading' under § 1512(b)[(1)]."                  Id.
    5
    The Rule 29 motion Ducoudray filed appeared to be limited
    to a motion for acquittal on just the 
    18 U.S.C. § 1512
    (b)(1)
    offense. However, the District Court did reference the criminal
    statutes underlying both offenses in its ruling denying the motion.
    On appeal, Ducoudray appears to argue that his Rule 29 motion
    encompassed the convictions for both offenses, and the government
    does not contest this characterization. For the purpose of our
    Rule 29 analysis, therefore, we assume without deciding that
    Ducoudray's Rule 29 motion below concerned both offenses.
    - 7 -
    In order to convict Ducoudray of violating 
    18 U.S.C. § 1503
    , the government had to prove beyond a reasonable doubt the
    following: that there was a pending judicial proceeding; that
    Ducoudray had notice of the proceeding; and that Ducoudray acted
    corruptly with the intent to influence or obstruct, or endeavored
    to influence or obstruct, the proceeding.             See United States v.
    Cueto,    
    151 F.3d 620
    ,   633   (7th   Cir.   1998);   United   States   v.
    Frankhauser, 
    80 F.3d 641
    , 650-51 (1st Cir. 1996).             The government
    contends that proof that Ducoudray tried to persuade Castillo to
    provide    false   testimony    at    Hernández's    criminal   trial   would
    suffice to support Ducoudray's conviction for violating § 1503,
    just as it would suffice to support his conviction for violating
    § 1512(b)(1).      Ducoudray makes no argument to the contrary.
    Accordingly, setting to one side any other theories of
    criminal liability that the parties address in their briefing to
    us, Ducoudray's challenge to the denial of his Rule 29 motion fails
    if the evidence at trial sufficed to show that, in Ducoudray's
    words, he "knowingly attempted to persuade [Castillo] to violate
    the law by providing false testimony."            Our review of the denial
    of the motion is de novo.           United States v. Hernández, 
    218 F.3d 58
    , 64 (1st Cir. 2000).6        But that review is "quite limited," as
    6 Ducoudray submitted a Rule 29 motion at the close of the
    government's evidence, but he did not renew his Rule 29 motion
    after the verdict. Contrary to the government's assertion that
    this failure to renew means the standard of review should be "for
    - 8 -
    "we must affirm unless the evidence, viewed in the light most
    favorable to the government, could not have persuaded any trier of
    fact of the defendant's guilt beyond a reasonable doubt."                   
    Id.
    (quoting United States v. Paradis, 
    802 F.2d 553
    , 559 (1st Cir.
    1986)).    Moreover, "[i]n applying this standard, 'no premium is
    placed upon direct as opposed to circumstantial evidence; both
    types of proof can adequately ground a conviction.'"              
    Id.
     (quoting
    United States v. Ortiz, 
    966 F.2d 707
    , 711 (1st Cir. 1992)).
    Finally,   "[a]   trial   court   in   passing   on   [a   Rule    29]   motion
    considers all of the evidence it has admitted, and . . . it must
    be this same quantum of evidence which is considered by the
    reviewing court."     United States v. Diaz, 
    300 F.3d 66
    , 77 (1st
    Cir. 2002) (quoting Lockhart v. Nelson, 
    488 U.S. 33
    , 41-42 (1988)).
    Thus, on appeal, "[u]nder Rule 29, we must examine 'all the
    evidence submitted to the jury, regardless of whether it was
    properly admitted.'"       
    Id.
     (quoting United States v. Gonzalez-
    Sanchez, 
    825 F.2d 572
    , 588 (1st Cir. 1987)).7
    clear and gross injustice only," because Ducoudray did not put on
    any evidence in his defense he did not have to renew his motion in
    order to preserve the issue. See Hernández, 
    218 F.3d at
    63 n.3.
    As such, our review is de novo. See 
    id. at 64
    .
    7 We thus reject Ducoudray's contention that we must ignore,
    or discount the weight to be given, certain evidence in evaluating
    his challenge to the denial of his Rule 29 motion due to the errors
    that he alleges the District Court made at trial with respect to
    that evidence. Later in this opinion, however, we do consider the
    challenges that Ducoudray makes to those trial rulings, but only
    in connection with Ducoudray's contention that those alleged
    - 9 -
    Applying these principles, we first consider Ducoudray's
    contention that the evidence did not supportably show beyond a
    reasonable doubt that Ducoudray "knew . . . [Castillo] was a
    witness in Hernández's pending proceeding."              In considering that
    contention, however, we must keep in mind that "[t]he key is not
    whether the defendant knows or doesn't know that someone is a
    'witness.'"      See United States v. Misla-Aldarondo, 
    478 F.3d 52
    , 69
    (1st Cir. 2007).       The key is whether the defendant knew that the
    person   might    be   providing   testimony   in   an    upcoming    official
    proceeding that the defendant's actions were likely to affect.
    See 
    id.
     (interpreting § 1512(b) and explaining that the inquiry is
    into   "whether    [the   defendant]   is   intending     to   head   off   the
    possibility of testimony in an 'official proceeding'"); United
    States v. Aguilar, 
    515 U.S. 593
    , 599 (1995) (holding, with respect
    to intent to influence, obstruct, or impede testimony in an
    official proceeding under § 1503, a defendant must have "knowledge
    that his actions are likely to affect the judicial proceeding").
    Here, the government put forth sufficient evidence from
    which a jury could find "that [Ducoudray] knew that an official
    proceeding had begun [against Hernández], or that he believed one
    to be likely in the future," Misla-Aldarondo, 
    478 F.3d at 69
    (footnote omitted).        The government also put forth sufficient
    errors provide a basis, either individually or in combination, for
    vacating his convictions. See infra §§ III-IV.
    - 10 -
    evidence from which a jury could reasonably conclude that Ducoudray
    knew that Castillo was likely to be a witness for the government
    in that proceeding.
    That evidence included a copy of the notice of appearance
    that        Ducoudray      filed      in     federal      court   confirming       his
    representation of Hernández in the federal case against him.                      That
    evidence also included Castillo's testimony about Ducoudray's
    request that Castillo "retract" his statements to law enforcement
    so that Hernández could "beat his case" at trial.                      After all, a
    jury could reasonably conclude from this testimony that Ducoudray
    was concerned about getting Castillo to change his story to help
    Hernández "beat his case" because Ducoudray thought that Castillo
    was likely both to testify as a witness against Hernández at trial
    and to provide testimony that would help the government to convict
    Hernández.           Hernández, 
    218 F.3d at 64
     (explaining that "all
    reasonable inferences [are] made in the light most favorable to
    the government" (quoting United States v. Loder, 
    23 F.3d 586
    , 590
    (1st       Cir.    1994)));   Diaz,    
    300 F.3d at 77
       ("In   assessing    the
    sufficiency of the evidence under Rule 29, 'we view the evidence
    and draw reasonable inferences in the light most favorable to the
    verdict.'" (quoting United States v. McGauley, 
    279 F.3d 62
    , 66
    (1st Cir. 2002))).8
    8
    Ducoudray also contends that Castillo's testimony cannot
    suffice to sustain the verdicts because he was a "biased witness,"
    - 11 -
    We turn, then, to the question of whether the evidence
    also sufficed to show that Ducoudray "knowingly" sought to persuade
    Castillo to give false testimony, if need be, at the upcoming trial
    of Hernández.      Ducoudray's chief argument that the evidence did
    not suffice in that regard is that "[t]he prosecution made no
    effort to show that . . . Ducoudray knowingly asked [Castillo] to
    retract truthful statements."       He contends the evidence suffices
    at most to show that Ducoudray was merely asking Castillo either
    to not "falsely implicate[]" Hernández or to invoke a valid Fifth-
    Amendment privilege against testifying.        In connection with this
    contention, Ducoudray argues the testimony that he told Castillo
    to "accept [his] responsibilities" shows that, in asking Castillo
    to "retract" what he had told authorities, Ducoudray was merely
    asking Castillo to "correct what [Hernández] had told [Ducoudray]
    were lies."
    We must, however, consider the evidence in the light
    most   favorable   to   the   verdict.     Hernández,   
    218 F.3d at 64
    (explaining that the court of appeals "must uphold any verdict
    that is 'supported by a plausible rendition of the record'"
    who was cooperating with the government. But, in reviewing the
    denial of a Rule 29 motion, we do not "weigh the evidence or make
    credibility judgments; these tasks are solely within the jury's
    province." Hernández, 
    218 F.3d at 64
    . Insofar as Ducoudray is
    also challenging the District Court's failure to provide a
    requested cooperating witness jury instruction, we separately
    address that argument later in this opinion. See infra § III.B.
    - 12 -
    (quoting Ortiz, 
    966 F.2d at 711
    )).         In addition, "if the evidence
    can be construed in various reasonable alternatives, the jury is
    entitled to freely choose from among them."               United States v.
    Smith, 
    680 F.2d 255
    , 259 (1st Cir. 1982).                Furthermore, "the
    government    need   not   present   evidence     that     precludes   every
    reasonable hypothesis inconsistent with guilt in order to sustain
    a conviction."     Hernández, 
    218 F.3d at 64
     (quoting Loder, 
    23 F.3d at 590
    ).
    When we review the record from this verdict-friendly
    perspective, it is clear that the evidence did not require the
    jury to view Ducoudray's attempt to persuade Castillo to "retract"
    his statements to authorities as merely a request to testify
    truthfully or to invoke a valid privilege.              Most significantly,
    Castillo testified that he understood the "retract" statement not
    to be advice that he should invoke a Fifth-Amendment right, but
    rather to be a request that he lie to authorities to help Hernández
    to "beat his case" at trial. Furthermore, Castillo testified that,
    during the same conversation in which the "retract" statement was
    made, he had told Ducoudray that what he had told authorities about
    Hernández's culpability for the conspiracy was the truth.              Thus,
    the jury could supportably find that, in making the request to
    "retract"    the   statement,   Ducoudray   was   not    merely   requesting
    Castillo to stay silent or tell the truth, but instead, if need
    - 13 -
    be, to lie in his own testimony at Hernández's trial to enable
    Hernández to "beat his case."
    The   reasonableness     of   such    a   conclusion   about    the
    intention behind Ducoudray's request to Castillo is bolstered by
    the   ample    record    evidence    that   supports     the    conclusion   that
    Ducoudray was trying to hide the fact of his visit to Castillo.
    That evidence ranges from evidence that shows that Ducoudray
    entered a false address in the visitor log of the correctional
    facility at which he visited Castillo, to evidence that shows that
    Ducoudray      lied   to   Castillo     about      Castillo's    lawyer   giving
    Ducoudray permission to speak with Castillo, to evidence that shows
    that Ducoudray told Castillo not to tell anyone about the visit,
    to evidence that shows that Ducoudray falsely claimed that he had
    not made the visit when Frankel initially asked him about it.
    To be sure, a jury was by no means required to conclude
    that Ducoudray sought to conceal his visit because he had asked
    Castillo to lie.        Perhaps, as Ducoudray posits in his reply brief,
    the jury could have found that Ducoudray was "aware[] that he was
    at least skirting a professional rule" -- namely Model Rule 4.2 of
    the American Bar Association Model Rules of Professional Conduct
    ("Rule 4.2")9 -- and thus that he "act[ed] surreptitiously [only]
    in order to avoid potential professional problems."
    9Rule 4.2 states that "[i]n representing a client, a lawyer
    shall not communicate about the subject of the representation with
    - 14 -
    But, a jury was entitled to draw a less favorable
    inference.      And, thus, the evidence supports the convictions.    See
    Misla-Aldarondo, 
    478 F.3d at 69
     (interpreting § 1512(b)).            For,
    even if, as Ducoudray posits, there might be some other "reasonable
    hypothesis" with respect to his actions that is "inconsistent with
    guilt," that possibility, on this record, does not reveal the
    evidence   to    be   insufficient.   Accordingly,   we   conclude   that
    Ducoudray's challenge to the denial of his Rule 29 motion fails.10
    a person the lawyer knows to be represented by another lawyer in
    the matter, unless the lawyer has the consent of the other lawyer
    or is authorized to do so by law or a court order." Model Rules
    of Prof'l Conduct r. 4.2 (Am. Bar Ass'n 2016).
    10  In light of the evidence just described, Ducoudray's
    challenge to the Rule 29 motion fails even if we assume that, as
    he contends, the District Court was mistakenly of the view both
    that, in visiting Castillo, Ducoudray violated Rule 4.2 and that
    such a violation "was relevant to proof of intent" with respect to
    either offense. But, wholly apart from whether there was evidence
    to support a finding that Ducoudray violated the prohibition set
    forth in Rule 4.2, a jury could have reasonably found from the
    evidence that we have described above that Ducoudray knew that
    Castillo was likely to testify at Hernández's trial and that
    Ducoudray encouraged Castillo, if need be, to lie in providing
    that testimony.
    Moreover, because the evidence suffices to support the
    convictions apart from whether the evidence reveals that Ducoudray
    violated Rule 4.2, we need not address Ducoudray's additional
    argument that the District Court erred in denying his Rule 29
    motion for the separate reason that there was no evidence that
    Ducoudray knew that Castillo was represented in the "same matter"
    as Hernández and thus that there was no basis for finding that
    Ducoudray violated Rule 4.2. We do address later in this opinion,
    however,   Ducoudray's   challenge   to  the   supplemental   jury
    instruction concerning Rule 4.2, see infra § III.D, including his
    contention that the instruction was unwarranted by the facts.
    - 15 -
    III.
    Ducoudray contends in the alternative that, even if his
    convictions need not be reversed due to insufficiency of the
    evidence, they must be vacated due to various trial errors that
    the District Court made.        We consider these various claimed trial
    errors in turn.
    A.
    Ducoudray first argues that the District Court erred
    when it admitted into evidence the email that Frankel sent to the
    AUSA and certain testimony that Frankel provided at trial, insofar
    as this evidence purported to describe what Castillo told Frankel
    concerning Castillo's conversation with Ducoudray.                 Ducoudray
    contends that the email and the testimony -- by offering that
    description -- were inadmissible hearsay under Federal Rule of
    Evidence 802 and that the erroneous admission of this evidence was
    not harmless.       In this regard, Ducoudray contends that this
    evidence had the prejudicial effect of lending credibility to
    statements of Castillo, "a convicted felon," by allowing such
    statements to be repeated through "the modulated voice of an
    attorney, practiced in the art of addressing judges and juries."
    "We review the legal interpretation of a rule of evidence
    de novo, but the decision to admit or exclude evidence is reviewed
    for an abuse of discretion."         United States v. Phoeun Lang, 
    672 F.3d 17
    ,   23   (1st   Cir.   2012).      In   addition,   we   review   any
    - 16 -
    "subsidiary fact-finding" that bears on the issue "for clear
    error."   See United States v. Burgos-Montes, 
    786 F.3d 92
    , 114 (1st
    Cir. 2015).
    1.
    We    start    with   Ducoudray's      challenge      to    the    Frankel
    testimony.        That testimony concerned what Castillo told Frankel
    about what Ducoudray "advised" Castillo during his visit with him.
    That testimony also concerned what Ducoudray told Castillo during
    that visit with respect to "whether or not . . . Ducoudray had
    spoken to [Frankel] prior to [that] visit."
    The problem for Ducoudray is the following.                       At first
    Ducoudray    made    a     hearsay   objection      to   the   admission        of   any
    testimony    from     Frankel      concerning    the     content    of    Castillo's
    conversation       with    Ducoudray.        But,    before     Frankel        actually
    testified as to what Castillo told him, Ducoudray's counsel then
    reversed course by telling the District Court that "whatever was
    covered in direct examination or cross-examination of [Castillo]
    could be covered by [Frankel]," because "[i]t would be hearsay,
    but it would be admissible."            As the record shows that Castillo
    had testified on direct examination and cross-examination about
    his conversation with Ducoudray at the correctional facility, we
    thus agree with the government that Ducoudray waived his hearsay
    objection to the Frankel testimony insofar as it purported to relay
    - 17 -
    what Ducoudray had said to Castillo during the visit.          See United
    States v. Sánchez-Berríos, 
    424 F.3d 65
    , 74 (1st Cir. 2005).
    2.
    We turn, then, to the email that Frankel sent.             The
    government    acknowledges    that   Ducoudray    preserved   his   hearsay
    objection to the admission of the email.         The government contends,
    however, that even if the email was improperly admitted, any error
    was harmless.     We agree.    Ducoudray does not contend on appeal
    that the email described any statements attributed to Castillo
    that exceeded the scope of Frankel's testimony about what Ducoudray
    or Castillo had said during their meeting. Thus, because Ducoudray
    waived his challenge to the Frankel testimony, any error in
    admitting the email was harmless.         See, e.g., United States v.
    Vigneau, 
    187 F.3d 70
    , 78-79 (1st Cir. 1999); United States v.
    Fulmer, 
    108 F.3d 1486
    , 1502 (1st Cir. 1997).
    B.
    Ducoudray also challenges the jury instructions.          But
    here, too, we find Ducoudray's arguments unpersuasive.
    Ducoudray first challenges the District Court's refusal
    to grant his request to give the jury a portion of the District
    Courts of the First Circuit Pattern Criminal Jury Instruction 2.08
    "on the caution due testimony witnesses cooperating under an
    - 18 -
    agreement with the prosecution."11             Ducoudray argues that the
    District Court's refusal to give his requested instruction was in
    error because Castillo was a cooperating witness. Ducoudray points
    out that Castillo "testified in [Ducoudray's] case as a result of
    his status as an accomplice in another [case -- the case against
    Hernández    --],   in   which   he   signed    a   plea   and   cooperation
    agreement."
    Ducoudray further contends that he was prejudiced by the
    District Court's refusal to give this "caution due" instruction.
    As he explains, even though "[t]he defense theory hung upon the
    lack of credibility of [Castillo]'s testimony," "the jury never
    learned the legal principle that [Castillo]'s testimony should be
    received with 'particular caution' because he 'may have had reason
    to make up stories or exaggerate . . [sic] because he wanted to
    help himself."
    Ducoudray concedes, however, that, insofar as he failed
    to object or renew his request for this instruction at trial after
    it had been denied, then our review is only for plain error.            And,
    11The instruction as requested by Ducoudray read: "You have
    heard the testimony of [Castillo].     He provided evidence under
    agreements with the government[.] Some people in this position
    are entirely truthful when testifying. Still, you should consider
    the testimony of [Castillo] with particular caution. He may have
    had reason to make up stories or exaggerate what others did because
    he wanted to help himself.       You must determine whether the
    testimony of such a witness has been affected by any interest in
    the outcome of this case, any prejudice for or against the
    defendant."
    - 19 -
    because we find that he did so fail, Ducoudray must overcome the
    hurdle of plain error review, which "nowhere looms larger than in
    the context of alleged instructional errors."            See United States
    v. Paniagua-Ramos, 
    251 F.3d 242
    , 246 (1st Cir. 2001).12
    To "vault this hurdle," Ducoudray must show "that an
    error occurred," "that the error was clear or obvious," "that the
    error affected his substantial rights," and "that the error so
    seriously impaired the fairness, integrity, or public reputation
    of the proceedings as to threaten a miscarriage of justice."             
    Id.
    We   have   made   it   clear,   moreover,   that   "a   showing   of   'mere
    possibilities [is] not enough' to prove that an instructional error
    affected a defendant's substantial rights."              United States v.
    Rivera-Izquierdo, 
    850 F.3d 38
    , 44 (1st Cir.), cert. denied, 
    137 S. Ct. 2204
     (2017) (quoting United States v. Procopio, 
    88 F.3d 21
    , 31
    (1st Cir. 1996)).
    Here, in light of the fact that the requested instruction
    would have only cautioned the jury that Castillo might have had
    "reason to make up stories or exaggerate" to "help himself," we do
    not see how Ducoudray can show on this record that the "outcome of
    the case would likely have changed" if the omitted instruction had
    been given.    
    Id.
     (quoting United States v. Colon, 
    744 F.3d 752
    ,
    12
    We, therefore, need not address the government's argument
    that Ducoudray waived appellate review of this challenge due to
    his actions below.
    - 20 -
    758 (1st Cir. 2014)).     Ducoudray does not dispute that he visited
    Castillo   and   asked   him   to   "retract"   his    statements   to   law
    enforcement.     He contends instead that he was not asking Castillo
    to lie. But Castillo's less innocent interpretation of Ducoudray's
    "retract" request was bolstered circumstantially by the wealth of
    evidence indicating that Ducoudray sought to conceal his visit
    with Castillo.
    The conclusion that Ducoudray has failed to show the
    required effect on his substantial rights, draws further support
    from the fact the District Court did instruct the jurors that they
    "[did not] have to accept the testimony of any witness if [they
    did not] find the witness credible" and that they should consider
    a witness's "apparent fairness or any bias that they may have
    displayed" and "any interest [they] may discern that [a witness]
    may have had in the outcome of the case."             See United States v.
    Carr, 
    5 F.3d 986
    , 992 (6th Cir. 1993).       Given that "we customarily
    assume that jurors follow the instructions given to them by the
    district court," United States v. Rodríguez, 
    735 F.3d 1
    , 12 (1st
    Cir. 2013), and that the jury had been apprised of both the
    evidence of Castillo's plea agreement (including its terms) and
    his cooperation with law enforcement, those general instructions
    provided a basis for the jury to be on the lookout for Castillo's
    potential bias.
    - 21 -
    Accordingly,   on   this   record,   "it   would   be     pure
    speculation to conclude that the [failure to provide the 'caution
    due' instruction] had any effect on deliberations," and "[s]uch
    speculation is insufficient to ground a successful claim that a
    clear error affected the defendant's substantial rights."         United
    States v. McFarlane, 
    491 F.3d 53
    , 61 (1st Cir. 2007); see also
    Carr, 
    5 F.3d at 992
     (finding no error in the trial court's failure
    to give a particular credibility instruction where the court had
    given general credibility instructions that "adequately informed
    the jury regarding the credibility of witness testimony").           Nor
    does Ducoudray identify any authority suggesting otherwise.           We
    thus find no plain error.
    C.
    Ducoudray separately argues that the instructions for
    the offense of tampering with a victim, witness, or an informant
    under 
    18 U.S.C. § 1512
    (b)(1) misstated the offense.     He points to
    the fact that the District Court rejected the Third Circuit pattern
    instruction regarding the specific intent element of that offense.
    He also contends that the failure to give that instruction was
    especially problematic because of the way that the District Court
    - 22 -
    described the offense and because the District Court also gave a
    supplemental instruction on Rule 4.2.13
    But, here, too, we find that the challenge to the
    District Court's instruction fails.             Prior to instructing the jury
    on this count, the District Court modified the instruction that
    the District Court intended to give the jury by including some
    additional text regarding the meaning of "corruptly persuades" in
    light of concerns that Ducoudray raised.             The District Court then
    announced the text of the instruction that would be (and was)
    provided       to   the     jury.     In    response,     Ducoudray's   counsel
    affirmatively stated that he had "no objection."                 We thus find
    that Ducoudray waived this challenge. See United States v. Hansen,
    
    434 F.3d 92
    , 101 (1st Cir. 2006).
    D.
    That brings us to Ducoudray's final challenge to the
    jury        instructions,     which   concerns      the    supplemental   jury
    13
    In his opening brief, Ducoudray states that his "arguments
    [with respect to the tampering with a victim, witness, or informant
    count] concerning the definition of 'corruptly' . . . apply with
    equal force to [the obstructing the due administration of justice
    count]."    However, Ducoudray does not explain why his argument
    concerning the instruction on the "corruptly persuades" element of
    the offense of tampering with a victim, witness, or informant would
    be applicable to the distinct jury instruction concerning the
    "corruptly" element of the offense of obstructing the due
    administration of justice.     Accordingly, we find the argument
    waived.    See United States v. Zannino, 
    895 F.2d 1
    , 17 (1990)
    ("[I]ssues adverted to in a perfunctory manner, unaccompanied by
    some effort at developed argumentation, are deemed waived.").
    - 23 -
    instruction that the District Court gave regarding Rule 4.2.       The
    instruction stated:
    The Cannons of Professional Conduct for
    Lawyers provide that, while representing a
    specific   client,   the  lawyer    shall  not
    communicate   about   the   subject    of  the
    representation with another defendant whom the
    lawyer knows to be represented by another
    lawyer in the matter, unless the lawyer has
    the consent of the other lawyer or is
    authorized to do so by law or a court order.
    These Canons are part of the Local Rules of
    this Court and have the force of law.
    The District Court, with respect to this instruction, did not
    instruct the jury that it had to find whether or not a violation
    of Rule 4.2 occurred.
    Ducoudray attacks the Rule 4.2 instruction on a number
    of grounds.    None, however, has merit.
    Ducoudray first argues that the instruction on Rule 4.2
    "was unwarranted by the facts."       He contends that "Frankel never
    represented [Castillo] in any federal case."         He also contends
    that the record does not support the finding that Ducoudray knew
    that Castillo was a defendant in the same case as Hernández.        He
    argues, therefore, that in meeting with Castillo he could not
    possibly have been violating Rule 4.2.
    It    does   not   appear    that   Ducoudray   raised   this
    "unwarranted by the facts" objection to the Rule 4.2 instruction
    below.   But, even if our review of the District Court's decision
    - 24 -
    to give this instruction on this record is only for an abuse of
    discretion, we find none.          See United States v. Anguiano-Morfin,
    
    713 F.3d 1208
    , 1209 (9th Cir. 2013) ("We review for an abuse of
    discretion whether [a jury instruction] has some foundation in the
    evidence." (internal quotation marks omitted)).
    Castillo    testified      that     Ducoudray     told    him     that
    Ducoudray had permission from Castillo's lawyer to speak with
    Castillo.     That     statement    reasonably     provides    circumstantial
    evidence that Ducoudray understood Castillo to be represented in
    the federal matter, especially when that statement is considered
    in the context of the tight timing between Castillo being named in
    the federal indictment with Hernández and Ducoudray's decision to
    go visit Castillo in the correctional facility in New York City.
    Moreover, when the fact of Castillo's representation came up during
    the   conversation     between     Ducoudray    and   Castillo,      the    record
    supportably shows that Ducoudray did not stop the conversation.
    In    addition,   Frankel,   Castillo's        lawyer,   testified     that    he
    represented Castillo with respect to the federal charges and that
    he had not given Ducoudray permission to speak with Castillo.14
    14
    Ducoudray separately contends that, at the time of his
    visit with Castillo, Castillo "was simply not 'another defendant
    who the lawyer knows to be represented by another lawyer in the
    matter,'" because the sealed indictment charging both Castillo and
    Hernández was not entered on the docket until the day of
    Ducoudray's visit with Castillo. But, Ducoudray does not identify
    where the record shows that he made the argument below that the
    timing of the sealed indictment's entry into the docket somehow
    - 25 -
    Thus, the record clearly provides "some foundation," 
    id.,
     for
    finding that Frankel did represent Castillo with respect to the
    federal   charges     against     Castillo,     that   Ducoudray    understood
    Castillo to be a represented co-defendant in the same matter as
    Hernández, and that Ducoudray nevertheless chose to speak with
    Castillo without "the consent of [Castillo's] lawyer" in that
    matter or "authoriz[ation] to do so by law or a court order."
    Model Rules of Prof'l Conduct r. 4.2.
    Ducoudray    argues,      in   the   alternative,         that   the
    instruction was given in error because the jury was in no position
    to determine what conduct would constitute a violation of Rule
    4.2.   Here, too, Ducoudray's challenge to the instruction was not
    apparently made below.           But, once again, even if we review the
    instruction for an abuse of discretion, see United States v.
    Gonzalez, 
    570 F.3d 16
    , 21 (1st Cir. 2009), we find none.
    Ducoudray's challenge on this score appears to rest
    entirely on his assertions in his brief about Rule 4.2's ambiguity.
    But, Ducoudray points to no authority to support his contention
    that a jury may not be permitted to pass on whether a professional
    rule   such    as   Rule   4.2   was    violated   simply   due    to    possible
    precludes a finding that, at the time of his visit with Castillo,
    Ducoudray had knowledge that Castillo was a defendant in the same
    case as Hernández. And, in any event, the evidence discussed above
    permitted the jury to infer that Ducoudray did know that Castillo
    was represented by Frankel in the federal matter, notwithstanding
    the timing of the entry on the docket of the sealed indictment.
    - 26 -
    uncertainty     about   what   the    rule     prohibits.      Moreover,    the
    government     identifies   precedents        in   which   juries   have   been
    permitted to consider the ethical obligations of attorneys under
    seemingly similar professional rules, which contain their own
    ambiguities.     See, e.g., United States v. Machi, 
    811 F.2d 991
    ,
    1000-02 (7th Cir. 1987).       Accordingly, and in light of the fact
    that jury was not instructed that it had to make a determination
    regarding whether Ducoudray violated Rule 4.2 or not, we do not
    see how we could conclude, based on what Ducoudray has argued in
    this regard, that the District Court abused its discretion in
    giving this instruction.
    Ducoudray's final challenge to the instruction regarding
    Rule 4.2 is that it improperly "relieved the prosecution of its
    burden to prove the element of corruption at the heart of both
    counts of the indictment by allowing the jury to rely upon its
    view of whether [Rule 4.2] was violated to find the required mens
    rea of both offenses."15        Ducoudray further contends that this
    instructional error is one of law and should be reviewed de novo.
    15 In his opening brief, Ducoudray makes only passing
    reference to the additional argument that he had no opportunity at
    trial to "fairly address" the purported Rule 4.2 violation "with
    facts and argument" or to argue that any violation of Rule 4.2 was
    not the corrupt intent charged in the indictment. Thus, we regard
    this underdeveloped argument as waived. See Zannino, 
    895 F.2d at 17
    . And, in any event, the record reveals that at the beginning
    of the second day of trial and prior to Frankel's testimony (and
    even before the close of the government's evidence), the District
    Court informed the parties that it would be providing an
    - 27 -
    But, the instruction, as written, did not tell the jury
    that it had to find that proof of the violation of Rule 4.2 in and
    of itself would satisfy any element of either of the offenses that
    Ducoudray was charged with committing.      Nor, by terms, did the
    instruction even tell the jury that proof of such a violation could
    in and of itself satisfy any such element.        Accordingly, this
    challenge is ultimately to the potentially misleading nature of
    the instruction's wording, and so our review of this preserved
    challenge to the instruction is only for abuse of discretion.    See
    Gonzalez, 
    570 F.3d at 21
    .16
    The government contends that the District Court did not
    err in providing this instruction.     In so arguing, the government
    relies on the explanation that the District Court gave when it
    addressed this issue in the context of a post-conviction motion
    for bail by Ducoudray.   There, the District Court stated that the
    instruction concerning Rule 4.2. Additionally, the record reveals
    no objection was offered by Ducoudray to the inclusion of the Rule
    4.2 instruction on the grounds that he lacked the opportunity to
    introduce or elicit evidence to rebut a purported Rule 4.2
    violation.
    16 Below, Ducoudray requested the District Court change the
    "have the force of law" language in the instruction to "carry
    enforceability" by arguing that while Rule 4.2 embodies a "rule of
    ethics" and describes conduct that would be "improper" and
    "unethical" for a lawyer to undertake, a violation of Rule 4.2 by
    a lawyer is "not illegal" because Rule 4.2 is "not a rule of law."
    Ducoudray, however, does not raise this argument in his briefing
    on appeal, and so we do not consider it. See United States v.
    Bauzó-Santiago, 
    867 F.3d 13
    , 21 (1st Cir. 2017).
    - 28 -
    instruction "did not tell the jury that [Ducoudray's] alleged
    conduct was, in fact, an ethical violation, and a violation of
    law," "did not suggest an absolute prohibition on legal visits to
    represented persons," and "did not direct[] the jury to determine
    that [Ducoudray] had the requisite mens rea."        United States v.
    Ducoudray-Acevedo, Criminal No. 15-166 (ADC), 
    2017 WL 1286783
    , *3
    (D.P.R. Apr. 5, 2017) (internal quotation marks omitted).           Thus,
    according to the government, this instruction was not improper
    because it merely identified "peripheral concepts" relevant to the
    jury's evaluation of Ducoudray's conduct and, insofar as it served
    this evidentiary function, it was perfectly permissible.       See 
    id.
    As     the   government   notes,   precedent   supports     the
    conclusion that proof of a violation of a professional rule may
    play an evidentiary function in assessing the mens rea of a lawyer
    charged with criminal conduct in other contexts. See, e.g., United
    States v. Kelly, 
    888 F.2d 732
    , 744 (11th Cir. 1989); Machi, 
    811 F.2d at 1000-02
    ; United States v. DeLucca, 
    630 F.2d 294
    , 301 (5th
    Cir. 1980); see also, e.g., United States v. Klauber, 
    611 F.2d 512
    , 520 (4th Cir. 1979).       And while it is true, as Ducoudray
    argues, that none of these cases concern Rule 4.2, we do not see
    why that fact shows that proof of a violation of Rule 4.2 could
    not serve a similar evidentiary function concerning Ducoudray's
    mens rea here.
    - 29 -
    The     fact   that   Ducoudray   was   visiting   Castillo   in
    violation of a professional ethical rule, such as Rule 4.2, could
    well be relevant to an assessment of whether he was acting with
    the required "corrupt" intent, rather than with the innocent intent
    that Ducoudray contended that he had.       And Ducoudray identifies no
    authority that supports a contrary conclusion.          Thus, Ducoudray
    supplies no basis on which we could rule that the District Court
    abused its discretion, insofar as the supplemental instruction
    served only the function of identifying the proscription that Rule
    4.2 sets forth.
    Moreover, Ducoudray never explains how the wording of
    the instruction misled the jury into concluding that proof of a
    violation to Rule 4.2 could, in and of itself, "stand in for the
    elements of the offenses," rather than that such proof could simply
    be relevant to the determination of whether Ducoudray had acted
    with the requisite corrupt intent.17        Consequently, we do not see
    a basis for concluding that the inclusion of this supplemental
    instruction was an abuse of discretion. After all, the instruction
    was given only as a supplemental instruction after the jury had
    been separately instructed about the elements of each offense that
    it was required to find in order to convict Ducoudray.           And the
    17Ducoudray, in passing, asserts that the wording of the Rule
    4.2 instruction "implied that [Ducoudray] had violated [Rule
    4.2]," but never explains how exactly the text of the instruction
    implies that is so.
    - 30 -
    instruction, which clearly appeared as a stand-alone instruction
    in the written instructions, did not, by its terms, reference any
    of the elements of the offenses or say anything about how Rule 4.2
    related to them.
    For these reasons, we see no merit in Ducoudray's various
    challenges to the supplemental instruction concerning Rule 4.2.
    And thus we see no basis for concluding that áthis instruction
    requires that the convictions -- with respect to either offense
    -- be vacated.
    IV.
    Ducoudray's final argument is that his convictions must
    be reversed on the distinct ground that, even if no single error
    at trial warrants reversal, the cumulative effect of the errors
    does.    But,    although   "[i]ndividual   errors,   insufficient   in
    themselves to necessitate a new trial, may in the aggregate have
    a more debilitating effect," United States v. Sepulveda, 
    15 F.3d 1161
    , 1195-96 (1st Cir. 1993), the cumulative error doctrine offers
    no help to Ducoudray.
    Our review of the individual alleged errors reveals that
    there were either no errors or that the objections to the alleged
    errors were waived, with the sole exception being the admission of
    the Frankel email to the AUSA.    But, as to that email evidence, we
    found that any error on the part of the District Court in admitting
    - 31 -
    that   evidence   was   harmless.    As   such,   we   find   Ducoudray's
    cumulative error argument to be meritless.
    V.
    The judgment is affirmed.
    - 32 -