United States v. Phillipos , 849 F.3d 464 ( 2017 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 15-1716
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    ROBEL KIDANE PHILLIPOS,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Douglas P. Woodlock, U.S. District Judge]
    Before
    Barron, Selya, and Stahl,
    Circuit Judges.
    Derege B. Demissie, with whom Demissie & Church was on brief,
    for appellant.
    Randall E. Kromm, Assistant United States Attorney, with whom
    Carmen M. Ortiz, United States Attorney, was on brief, for
    appellee.
    February 24, 2017
    BARRON, Circuit Judge.                 On October 28, 2014, Robel
    Phillipos was convicted under 18 U.S.C. § 1001(a)(2) on two counts
    of making false statements to federal authorities in the weeks
    following the Boston Marathon bombing.                    The bombing occurred on
    April 15, 2013.         The statements related to Phillipos's possible
    participation, three days later, in the removal and disposal of a
    backpack thought to contain evidence related to the attack from
    the college dormitory room of Dzhokhar Tsarnaev, one of the bombing
    suspects and a friend of the defendant's at college.                         Phillipos
    was   sentenced    to    three   years'          imprisonment    and   three    years'
    supervised release.       He now challenges his convictions on a number
    of grounds that we will address, along with the facts relevant to
    each, in turn.     Because we find that none of these challenges has
    merit, we affirm.
    I.
    We start with Phillipos's challenges to the admission
    into evidence of a signed confession, in which Phillipos admitted
    to making the false statements that are at issue during two
    informal interviews with federal agents in the two weeks following
    the bombing.      Phillipos signed that confession at the conclusion
    of    an   interview     with    an    agent       of     the   Federal     Bureau    of
    Investigation ("FBI") on April 26, 2013.                   Phillipos contends that
    the   District    Court    erred      in    both    (1)    refusing    to   conduct   a
    preliminary hearing on the admissibility of the confession unless
    - 2 -
    Phillipos would agree to submit to cross-examination at that
    hearing on the contents of an affidavit that he submitted regarding
    the circumstances of the confession, and (2) failing to make a
    determination prior to the introduction of the confession into
    evidence as to whether Phillipos made the confession voluntarily.
    Neither challenge warrants reversal of the convictions.
    A.
    We begin with the first of Phillipos's challenges to the
    admissibility of the confession, which concerns the denial of his
    request for an evidentiary hearing on the voluntariness of his
    confession because he refused to submit to cross-examination.
    Phillipos sought the hearing in connection with his motion to
    suppress the confession pursuant to the Fifth Amendment's Due
    Process Clause.
    Phillipos acknowledged that he had been informed of his
    rights, as required by Miranda v. Arizona, 
    384 U.S. 436
    (1966),
    prior   to   making     the   confession.      But    he   contended   that   the
    circumstances under which he made it were coercive.               In support of
    this    motion,   Phillipos      relied     solely    on   his   own   affidavit
    recounting his version of those circumstances.
    Specifically, Phillipos's affidavit alleged that the
    interviewing      FBI     agent,     Michael         Delapena,    "interrogated
    [Phillipos] for several hours in a small room."                  Phillipos also
    alleged that, during that time, Delapena administered a polygraph
    - 3 -
    test, and told Phillipos that Phillipos could only answer questions
    with "yes or no."        As a result, Phillipos alleged, he answered
    "no" to certain questions because he could not give the truthful
    answer, which would have been that he did not remember.                  Phillipos
    also alleged that Delapena did not offer Phillipos food; that
    Delapena "got close to [Phillipos's] face" and cursed at him; and
    that Delapena locked the door and told Phillipos, "[T]ell me
    everything that happened.        There are wolves outside the door, you
    don't want me to unlock the door."             In addition, Phillipos alleged
    that, at the end of the interrogation, Delapena presented him with
    a typed confession to sign, which Phillipos signed because "[he]
    felt that [he] had no choice but to sign it if [he] were to leave
    without being arrested."
    Phillipos    argued      that     the   affidavit      he   submitted
    sufficed to show that there were facts in dispute regarding the
    confession's     voluntary      nature,      because    the   account     in    the
    affidavit    conflicted    in    key    respects       with   the    account    the
    government set forth in its opposition to his motion to suppress
    the confession that it had filed.              In its filing, the government
    did not dispute that Delapena questioned Phillipos for several
    hours in a small room.
    The government did, however, dispute other aspects of
    Phillipos's account. Specifically, the government stated that,
    prior   to   administering      the    polygraph,      Delapena     explained    to
    - 4 -
    Phillipos that the polygraph questions had to be answered with a
    "yes or no," and that if Phillipos did not remember something,
    Delapena would rephrase the question so that Phillipos could
    truthfully answer with a "yes" or "no."       The government's account
    also   conflicted   with   Phillipos's   in   the   following   respects:
    Delapena did offer Phillipos food; Delapena "at no time . . .
    raise[d] his voice, curse[d], or otherwise treat[ed] the defendant
    discourteously"; Delapena locked the door to the interview room
    only after Phillipos expressed concern that agents outside were
    angry with him, and, in doing so, Delapena told Phillipos, "Don't
    worry about them.     They're outside; I'm here with you.        I don't
    judge you."     Finally, the government stated in its filing that
    Phillipos sat with Delapena as Delapena typed up the confession,
    that Delapena "conferred constantly" with Phillipos to ensure that
    Delapena was accurately setting forth Phillipos's account, and
    that, at several points, Phillipos asked Delapena to make specific
    changes to the account, which Delapena did.
    A defendant is entitled to an evidentiary hearing as to
    the voluntariness of his confession only if the defendant "makes
    a sufficient threshold showing that material facts are in doubt or
    dispute, and that such facts cannot reliably be resolved on a paper
    record."     United States v. Staula, 
    80 F.3d 596
    , 603 (1st Cir.
    1996).     Applying that requirement to Phillipos's request for the
    hearing, the District Court acknowledged that the allegations in
    - 5 -
    Phillipos's affidavit, if credited, would suffice to establish a
    factual dispute that would warrant a hearing.            But the District
    Court went on to explain that the affidavit could suffice to
    establish that factual dispute only if Phillipos agreed to be
    cross-examined about the affidavit's contents at the hearing.
    Otherwise, the District Court ruled, the affidavit "cannot be
    tested" and would be "illusory."      And, as a result, there would be
    no basis for finding that Phillipos had established the requisite
    factual dispute.
    We review a preserved challenge to a denial of a request
    for a preliminary hearing for abuse of discretion. United States
    v. Jiménez, 
    419 F.3d 34
    , 42 (1st Cir. 2005).          "Abuse of discretion
    occurs 'when a relevant factor deserving of significant weight is
    overlooked, or when an improper factor is accorded significant
    weight, or when the court considers the appropriate mix of factors,
    but commits a palpable error of judgment in calibrating the
    decisional scales.'"     
    Id. at 43
    (quoting United States v. Gilbert,
    
    229 F.3d 15
    , 21 (1st Cir. 2000)). "Within this framework, an error
    of law is always tantamount to an abuse of discretion."              Torres-
    Rivera v. O'Neill-Cancel, 
    524 F.3d 331
    , 336 (1st Cir. 2008).
    Phillipos contends that the District Court abused its
    discretion     by   making   his   willingness   to    submit   to   cross-
    examination a condition of holding the hearing. Phillipos contends
    that the condition effectively -- and impermissibly -- "[f]orc[ed]
    - 6 -
    him to choose between" asserting his constitutional right against
    self-incrimination    and   asserting    his   right   to   an   evidentiary
    hearing regarding the voluntariness of his confession.              But, we do
    not agree.
    Phillipos points to nothing in the record besides his
    affidavit that could have provided a basis for finding that he had
    met his burden of demonstrating a factual dispute that would
    warrant an evidentiary hearing at the time that the District Court
    imposed   the   cross-examination   condition.         In   fact,    when   the
    District Court asked one of Phillipos's attorneys, prior to denying
    the motion for the hearing, to "[p]oint [the court] to" evidence
    in the record besides Phillipos's own affidavit that would support
    Phillipos's contention that his confession was not voluntary, the
    attorney failed to do so.1
    1 At oral argument, Phillipos contended for the first time
    that there was enough evidence in the record, apart from
    Phillipos's affidavit, to create a factual dispute regarding the
    voluntariness of the confession so as to warrant a pre-trial
    hearing. Leaving aside the allegations set forth in his affidavit,
    Phillipos pointed to the evidence otherwise in the record that
    Phillipos was interviewed from 10:00 A.M. until 3:00 P.M., was
    interviewed in a small room, and that, before he gave his
    confession, he was told, among other things, that he had failed
    the polygraph test and thus would be in trouble. But Phillipos
    conceded at oral argument that none of these facts were disputed
    by the government at the time that he moved for the evidentiary
    hearing. And "[a] hearing is required only if the movant makes a
    sufficient threshold showing that material facts are in doubt or
    dispute, and that such facts cannot reliably be resolved on a paper
    record[] . . . which, if resolved in his favor, would entitle him
    to the requested relief." 
    Staula, 80 F.3d at 603
    .
    - 7 -
    As a result, the District Court simply determined that
    Phillipos failed to establish a sufficient threshold basis for
    finding that there was a factual dispute over the voluntariness of
    his confession because he had proffered only an untested -- and
    thus illusory -- affidavit. In doing so, the District Court
    followed a course that we approved, albeit in a different context,
    in United States v. Baskin, 
    424 F.3d 1
    (1st Cir. 2005), which is
    a case that Phillipos fails to address.
    There, a defendant relied solely on factual allegations
    set forth in his own affidavit in moving on Fourth Amendment
    grounds to suppress the fruits of a search.             
    Id. at 3.
            The
    defendant refused, however, to submit to cross-examination that
    would allow the government to "test the truth" of the factual
    allegations set forth in the affidavit; the defendant instead
    invoked his Fifth Amendment privilege against self-incrimination.
    
    Id. In consequence,
    the District Court refused to credit the
    affidavit and then denied the motion to suppress.           
    Id. We held
    that the district court did not abuse its discretion in so ruling,
    because the district court was entitled to conclude that the
    defendant's own untested affidavit was not in and of itself
    sufficient    to   "establish   any   ground   for   asserting    a    Fourth
    Amendment right."     
    Id. To be
    sure, Baskin involved a district court's denial,
    after an evidentiary hearing, of a defendant's motion to suppress
    - 8 -
    evidence allegedly acquired in violation of the defendant's Fourth
    Amendment right against an unreasonable search.          
    Id. By contrast,
    here we confront a defendant's motion for an evidentiary hearing
    to determine whether, under the Fifth Amendment, a confession was
    voluntarily made.       But, like the defendant in Baskin, Phillipos
    sought to establish the requisite factual predicate for his motion
    solely on the basis of his own affidavit, which he would not allow
    the   government   to   test    through    cross-examination.        Nor   did
    Phillipos identify any additional evidence that he would be able
    to present at the hearing, other than his speculative assertions
    that he might have established support for his affidavit's account
    through his own cross-examination of the government agents who
    conducted the interviews that led to the confession.
    In light of Baskin, we see no basis for concluding that
    the District Court abused its discretion in finding that the
    affidavit, on its own, failed to establish the sufficient threshold
    showing of a factual dispute that Phillipos was required to make.
    As we have said before, "[t]he district court has considerable
    discretion in determining the need for, and the utility of,
    evidentiary hearings, and we will reverse the court's denial of an
    evidentiary hearing in respect to a motion in a criminal case only
    for manifest abuse of that discretion."          
    Staula, 80 F.3d at 603
    .
    Accordingly,   this     first   challenge    regarding   the   use   of    the
    confession at trial fails.
    - 9 -
    B.
    Phillipos next contends that the District Court erred by
    failing to make a finding as to the voluntariness of the confession
    before admitting it into evidence.      Phillipos does not contend
    that the District Court was required to find that Phillipos's
    confession was involuntary, as he concedes that the record as it
    then stood supported the voluntariness finding made.      Phillipos
    contends only that the timing of the District Court's voluntariness
    determination prejudiced Phillipos's ability to develop a complete
    record in support of his contention that the confession was not
    voluntarily given.
    Phillipos failed to raise this objection below, and so
    our review is only for plain error.     United States v. Olano, 
    507 U.S. 725
    , 732 (1993).     "Review for plain error entails four
    showings: (1) that an error occurred (2) which was clear or obvious
    and which not only (3) affected the defendant’s substantial rights,
    but also (4) seriously impaired the fairness, integrity, or public
    reputation of judicial proceedings."    United States v. Duarte, 
    246 F.3d 56
    , 60 (1st Cir. 2001).
    Although the District Court made a preliminary finding
    pre-trial that the confession was voluntary, the government does
    not appear to dispute that the District Court erred in failing to
    make a conclusive voluntariness determination "[b]efore [the]
    confession [was] received in evidence."    18 U.S.C. § 3501(a).   See
    - 10 -
    also Sims v. State of Georgia, 
    385 U.S. 538
    , 543–44 (1967) ("[A]
    jury is not to hear a confession unless and until the trial judge
    has determined that it was freely and voluntarily given."); Crane
    v. Kentucky, 
    476 U.S. 683
    , 687–88 (1986) ("To assure that the
    fruits of such techniques are never used to secure a conviction,
    due process also requires 'that a jury [not] hear a confession
    unless and until the trial judge . . . has determined that it was
    freely and voluntarily given.'" (alteration in original) (quoting
    
    Sims, 385 U.S. at 543-44
    )); United States v. Feliz, 
    794 F.3d 123
    ,
    130 (1st Cir. 2015) ("Although the judge need not make formal
    findings of fact or write an opinion, his conclusion that the
    confession     is   voluntary   must   appear   from    the    record   with
    unmistakable clarity." (quoting 
    Sims, 385 U.S. at 544
    )).            But, as
    Phillipos identifies no way in which the timing of the District
    Court’s   voluntariness    determination     affected    his    substantial
    rights, we agree with the government that there is no plain error.
    See 
    Duarte, 246 F.3d at 60
    .
    Phillipos argues otherwise on the ground that the late
    timing of the voluntariness determination interfered with his
    ability to make his case for suppressing the confession pre-trial,
    as he contends that it would have been easier for him to make his
    case for suppression at that time.          But Phillipos did have the
    chance to make that pre-trial case.        He simply failed at that time
    to establish any factual dispute with the government's account.
    - 11 -
    Thus, the fact that the District Court made only a preliminary
    voluntariness determination prior to the start of the trial did
    not    prejudice   Phillipos.     Accordingly,   this    version    of   his
    challenge concerning the use of the confession at trial also fails.
    II.
    Phillipos next contends that the District Court erred by
    excluding testimony from Phillipos's proposed expert on false
    confessions, Dr. Richard Leo, without first conducting a hearing
    under Daubert v. Merrell Dow Pharmaceuticals, Inc., 
    509 U.S. 579
    (1993), as to whether Dr. Leo's testimony qualified as expert
    testimony.     We do not agree.
    Daubert   establishes    that   before     admitting   expert
    testimony, the trial court must fulfill its "gatekeeping role" by
    making an independent determination that the expert's proffered
    scientific knowledge is both reliable and 
    relevant. 509 U.S. at 597
    .    Daubert also explains that the reliability determination
    "entails a preliminary assessment of whether the reasoning or
    methodology underlying the testimony is scientifically valid and
    of whether that reasoning or methodology properly can be applied
    to the facts in issue."     
    Id. at 592-93.
    Phillipos contends that such an assessment may be made
    only after a hearing.       There is, however, no such requirement.
    Phillipos identifies no precedent that supports his view.           And we
    have made clear that "[t]here is no particular procedure that the
    - 12 -
    trial court is required to follow in executing its gatekeeping
    function under Daubert."      Smith v. Jenkins, 
    732 F.3d 51
    , 64 (1st
    Cir. 2013) (internal quotation marks and citation omitted); see
    also Kumho Tire Co. v. Carmichael, 
    526 U.S. 137
    , 152 (1999)
    (affirming district court's Daubert inquiry where the court did
    not hold a hearing because "[t]he trial court must have the same
    kind of latitude in deciding how to test an expert's reliability
    . . . as it enjoys when it decides whether or not that expert's
    relevant testimony is reliable" (emphasis in original)); United
    States v. Nichols, 
    169 F.3d 1255
    , 1262-64 (10th Cir. 1999) (a
    district court has discretion not to hold a pretrial evidentiary
    reliability hearing in carrying out its gatekeeping function);
    Hopkins v. Dow Corning Corp., 
    33 F.3d 1116
    , 1124 (9th Cir. 1994)
    ("The district court is not required to hold a . . . hearing, but
    rather must merely make a determination as to the proposed expert's
    qualifications.").
    The only cases that Phillipos relies on in arguing
    otherwise are not on point. Each held only that the district court
    erred in excluding testimony under Daubert because the district
    court had not considered the Daubert factors at all.           See United
    States v. Hall, 
    93 F.3d 1337
    (7th Cir. 1996); United States v.
    Belyea,   159    F.   App'x   525     (4th   Cir.   2005)   (per   curiam)
    (unpublished).
    - 13 -
    The District Court made no such mistake here.                      It
    provided both Phillipos and the government multiple opportunities
    to explain why Dr. Leo's testimony should or should not be admitted
    under Daubert.         Moreover, when the District Court ultimately
    decided    to    exclude     Dr.   Leo's   testimony,    the    District    Court
    explained that it had given a fair amount of thought to the issue
    and provided a detailed explanation of why it was excluding the
    testimony under the Daubert factors.            It is thus clear to us that
    the District Court performed the gatekeeping role that Daubert
    requires.
    Phillipos does appear to contend, separately, that the
    District Court erred in performing that gatekeeping role by ruling
    that Dr. Leo's testimony was insufficiently reliable and thus must
    be   excluded.     Because     Phillipos   preserved    this    challenge,     our
    review is for abuse of discretion.              
    Smith, 732 F.3d at 64
    .          We
    find none.
    Under    Daubert,     "[t]o   determine    whether    an    expert’s
    testimony is sufficiently reliable, the trial court considers
    whether 'the testimony is based on sufficient facts or data';
    whether 'the testimony is the product of reliable principles and
    methods';    and     whether    'the   expert   has    reliably    applied     the
    principles and methods to the facts of the case.'"                      
    Id. at 64
    (quoting Fed. R. Evid. 702(b-d)).               The trial court may also
    consider    other     factors,     "including    but    not    limited    to   the
    - 14 -
    verifiability of the expert's theory or technique, the error rate
    inherent    therein,    whether    the    theory     or   technique   has   been
    published and/or subjected to peer review, and its level of
    acceptance within the scientific community."              Samaan v. St. Joseph
    Hosp., 
    670 F.3d 21
    , 31-32 (1st Cir. 2012) (internal quotation marks
    and citation omitted).
    In this case, the District Court considered competing
    analyses of the reliability of Dr. Leo's studies and found that
    there was "no indication that there is a body of reliable material
    that constitutes understanding in this area," and that "it would
    introduce the jury . . . to a kind of faux science to present Dr.
    Leo's   testimony."      Whether    or    not   we    would   reach   the   same
    conclusion, the record certainly shows that the one that the
    District Court reached is reasonable.           Cf. People v. Kowalski, 
    821 N.W.2d 14
    , 31-32 (Mich. 2012) (no abuse of discretion where trial
    court concluded that Dr. Leo's testimony relied on "unreliable"
    sources    and   used   "unreliable      methodology"      that   "resulted   in
    conclusions consistent with Leo's own preconceived beliefs rather
    than testable results consistent with an objective, scientific
    process"); State v. Rafay, 
    285 P.3d 83
    , 112 (Wash. Ct. App. 2012)
    (no abuse of discretion where "Leo was unable to testify about any
    meaningful correlation between specific interrogation methods and
    false confessions or provide any method for the trier of fact to
    analyze the effect of the general concepts on the reliability of
    - 15 -
    the defendants' confessions"); Vent v. State, 
    67 P.3d 661
    , 667-
    670 (Alaska Ct. App. 2003) (no abuse of discretion where trial
    court concluded that "there was no way to quantify or test Dr.
    Leo's conclusions that certain techniques might lead to false
    confessions").
    III.
    Finally, and most significantly, Phillipos appeals the
    District Court's denial of his motion for acquittal.                    The jury
    found Phillipos guilty of two counts of violating 18 U.S.C.
    § 1001(a)(2), which applies to those who "make[] any materially
    false, fictitious, or fraudulent statement or representation" to
    federal authorities.
    Specifically, the jury found Phillipos guilty, under
    Count   One    of   the    indictment,   of    making   the   following    false
    statements to a federal agent during an interview on April 20,
    2013: (1) Phillipos did not remember going to Tsarnaev's dormitory
    room on the evening of April 18; and (2) Phillipos went to the
    room with Dias Kadyrbayev and Azamat Tazhayakov, two friends of
    his and Tsarnaev's from college, on the evening of April 18, but
    no one entered the room.
    The jury also found Phillipos guilty, under Count Two of
    the indictment, of making the following three false statements
    during an April 25, 2013 interview with a federal agent: (1)
    Phillipos     had   only    entered   Tsarnaev's    dormitory    room     on   one
    - 16 -
    occasion on April 18, which was sometime in the afternoon when he
    spoke to Tsarnaev for approximately ten minutes; (2) neither
    Phillipos,     Kadyrbayev,    or    Tazhayakov       took    a     backpack    from
    Tsarnaev's room on the evening of April 18; and (3) Phillipos was
    not aware of Kadyrbayev or Tazhayakov removing anything from
    Tsarnaev's room on the evening of April 18.
    On appeal, Phillipos does not contest the falsity of
    these statements.       Instead, he makes three separate arguments as
    to why the denial of his motion for acquittal must be reversed.
    First, he contends that there was insufficient evidence to support
    a finding that these statements, even though false, were ones to
    which section 1001 applies.         Second, he contends that there was
    insufficient evidence to support a finding that he made the
    statements "knowingly and willfully."          Third, he contends that, as
    applied   to    his   statements,   the   statute     is     unconstitutionally
    vague.
    Reviewing the denial of Phillipos's motion for acquittal
    de   novo,     eschewing   credibility       judgments,      and     drawing    all
    reasonable inferences in favor of the verdict, see United States
    v. Mardirosian, 
    602 F.3d 1
    , 7 (1st Cir. 2010), we conclude that a
    rational jury could have found beyond a reasonable doubt that
    section   1001    encompassed   statements      in    each    count    for     which
    Phillipos was convicted and that Phillipos made these statements
    - 17 -
    knowingly    and     willfully.        We   also     reject      Phillipos's
    constitutional vagueness challenge.
    A.
    Phillipos relies on two separate arguments in contending
    that the record does not suffice to show that the five false
    statements at issue are of the type which violate section 1001.
    We reject both.
    1.
    Phillipos first argues that the evidence at trial did
    not suffice to show that his statements were "material," as section
    1001 requires.     In rejecting this aspect of Phillipos's challenge,
    we base our analysis on our decision in United States v. Mehanna,
    
    735 F.3d 32
    (1st Cir. 2014), cert denied, 
    135 S. Ct. 49
    (2014).
    There,   a   jury   had   convicted    the   defendant,    Tarek
    Mehanna, of violating section 1001 by making false statements in
    connection with an ongoing terrorism investigation to the FBI
    during informal interviews not unlike the ones that are at issue
    
    here. 735 F.3d at 41-42
    . The statements concerned the whereabouts
    of one of Mehanna's friends, Daniel Maldonado.             
    Id. When FBI
    agents asked Mehanna when he had last heard from Maldonado, Mehanna
    falsely told the agents that he had last heard from Maldonado two
    weeks earlier and that Maldonado was living in Egypt.            
    Id. at 54.
    In fact, however, Mehanna had spoken to Maldonado that week and
    - 18 -
    was aware that Maldonado was in Somalia training for violent jihad.
    
    Id. On appeal,
    Mehanna argued that no reasonable jury could
    find that his false statements were material, because the agents
    knew the answers to their questions even before they asked them,
    such that Mehanna's false statements did not in fact mislead them.
    
    Id. We rejected
    that argument.     
    Id. at 54-55.
            We held that to be
    material, a false statement "need not actually have influenced the
    governmental function," 
    id. at 54,
    but rather need only be of the
    kind that "could have provoked governmental action,"               
    id. (quoting United
    States v. Sebaggala, 
    256 F.3d 59
    , 65 (1st Cir. 2001)).               We
    explained that "the proper inquiry is not whether the tendency to
    influence bears upon a particular aspect of the investigation but,
    rather, whether it would bear upon the investigation in the
    abstract or in the normal course."         
    Id. Applying that
    standard, we then concluded that a jury
    reasonably could find that Mehanna's statements about Maldonado
    "had a natural tendency to influence an FBI investigation into
    terrorism."       
    Id. at 55.
       In setting forth this conclusion, we
    explained that the record supported a jury's finding that "the
    defendant   was    plainly   attempting    to    obscure    both   Maldonado's
    participation in terrorist endeavors and the telephone call in
    which he and Maldonado had discussed jihad and terrorist training,"
    - 19 -
    and that "the defendant's mendacity was undertaken for the purpose
    of misdirecting the ongoing FBI investigation."                
    Id. Given Mehanna,
      we    have    little     difficulty        rejecting
    Phillipos's   contention      that    the    evidence     is   insufficient      to
    support Phillipos's convictions under both of the false statement
    counts in the indictment.       The jury found Phillipos guilty, under
    both counts of the indictment, of making false statements that are
    akin to the statements we found material in Mehanna.                  See, e.g.,
    United   States     v.   Natelli,    
    527 F.2d 311
    ,   324   (2d    Cir.    1975)
    (recognizing that where a single count of an indictment charges a
    defendant   with     multiple   false       statements,    jury      can    convict
    provided that it unanimously agrees defendant was guilty of making
    at least one of the false statements charged); United States v.
    Duncan, 
    850 F.2d 1104
    , 1105 (6th Cir. 1988) (same), overruled on
    other grounds by Schad v. Arizona, 
    501 U.S. 624
    (1991); United
    States v. Mangieri, 
    694 F.2d 1270
    , 1279-81 (D.C. Cir. 1982) (same);
    United States v. Jessee, 
    605 F.2d 430
    , 431 (9th Cir. 1979) (per
    curiam) (same).
    Specifically, the jury found Phillipos guilty under
    Count One for stating, on April 20, that, when he returned to the
    door of Tsarnaev's dormitory room on April 18 at approximately
    10:00 P.M. with Kadyrbayev and Tazhayakov, no one entered the room.
    And the jury found Phillipos guilty under Count Two for the
    following statements on April 25:           that Phillipos was not aware of
    - 20 -
    Kadyrbayev or Tazhayakov taking anything from Tsarnaev's dormitory
    room on the evening of April 18; and that neither he nor Kadyrbayev
    or Tazhayakov took a backpack from Tsarnaev's dormitory room on
    the evening of April 18.
    These statements were made in the midst of a federal
    terrorism investigation.        And they provided false information
    about whether Phillipos and his compatriots entered the bombing
    suspect's dormitory room soon after the deadly bombing, went into
    the suspect's backpack, and left the room with evidence in tow.
    Thus, like the statements in Mehanna, these statements by Phillipos
    could reasonably be deemed to have been intended to obscure the
    potentially unlawful activities of the defendant's friends from
    law enforcement and thereby to frustrate an ongoing terrorism
    investigation.    See 
    Mehanna, 735 F.3d at 55
    ("During the critical
    interview, the defendant was plainly attempting to obscure both
    Maldonado's participation in terrorist endeavors and the telephone
    call in which he and Maldonado had discussed jihad and terrorist
    training. The misinformation imparted by the defendant thus had a
    natural     propensity   to   influence    an   FBI   investigation   into
    terrorist activity.").
    To be sure, other individuals had given law enforcement
    information about the backpack.      Phillipos thus contends that law
    enforcement already knew the information that his false statements
    obscured.     Mehanna makes clear, however, that such knowledge on
    - 21 -
    the part of law enforcement is of no moment in determining whether
    false statements are material.             What matters is whether the
    statement in question would be material to an investigation in the
    normal course, not whether the statement was actually material to
    the particular investigation in fact.            And, here, a jury could
    reasonably find that Phillipos's statements deprived the agents of
    important corroborating information regarding where, when, and by
    whom key evidence had been removed.
    We recognize that Phillipos contends that Mehanna is
    distinguishable because the investigation into the Boston Marathon
    bombing was already complete at the time Phillipos made the false
    statements. But, as the government rightly notes, it is impossible
    to conclude that a jury could not reasonably find otherwise. Even
    though Tsarnaev had been apprehended at the time of Phillipos's
    interviews, the government still had an interest in continuing to
    investigate   the    matter,   given   the   significant   public   safety
    interest in determining who might have been involved in the bombing
    and the government's need to develop the case for prosecution.
    Thus, Phillipos's materiality-based sufficiency challenge fails.
    2.
    Phillipos also contends that his motion for acquittal
    was   wrongly       denied     --    Mehanna's     materiality      holding
    notwithstanding -- because none of the false statements at issue
    are "the type of statements and conduct that [C]ongress intended
    - 22 -
    to criminalize."       To support this contention, Phillipos relies on
    a line of cases that had established, for a time, what was known
    as the "exculpatory no" doctrine.
    When the cases in that line were decided, the version of
    section 1001 that was in place prohibited the making of "any false,
    fictitious     or    fraudulent    statements"    in   certain    government
    matters.     See Brogan v. United States, 
    522 U.S. 398
    , 400 (1998)
    (quoting 18 U.S.C. § 1001 (1988 ed.)). The "exculpatory no"
    doctrine interpreted that version of section 1001, despite its
    seemingly all-encompassing sweep, not to apply to a statement that
    a defendant made to a law enforcement officer during an informal
    interview    in     which   the   defendant   simply   denied    engaging   in
    wrongdoing.       See, e.g., United States v. Chevoor, 
    526 F.2d 178
    ,
    182 (1st Cir. 1975) (holding that statements that "fall within the
    'exculpatory no' category of responses . . . are outside the scope
    of 'statements' within the meaning of the statute").
    Phillipos contends that "Chevoor's scenario is nearly
    identical" to his own, because, like the defendant in Chevoor,
    Phillipos "did not fabricate a misleading story . . . or send the
    [federal] agents on a wild goose chase."         Instead, he merely "gave
    negative, oral responses to the questioning."            As the government
    points out, however, the "exculpatory no" doctrine that we adopted
    in Chevoor was overturned by the Supreme Court in Brogan, 
    522 U.S. 398
    .   In Brogan, the Supreme Court held that, by its plain terms,
    - 23 -
    the   earlier   version    of   section     1001   "cover[ed]     'any'   false
    statement -- that is, a false statement 'of whatever kind,'" and
    "[t]he word 'no' in response to a question assuredly makes a
    'statement.'"       
    Id. at 400-01
    (citation omitted).             As such, the
    Court held that the plain text of the statute as it then existed
    applied to "exculpatory no" statements, even though, as Justice
    Ginsburg observed, "[i]t is doubtful Congress intended § 1001 to
    cast so large a net."      
    Id. at 412
    (Ginsburg, J., concurring in the
    judgment).
    Phillipos's   only   answer     is    to   suggest   that    Brogan
    overruled only "portions" of Chevoor, and that Chevoor's holding
    regarding     the    "exculpatory     no"     doctrine      remains      binding
    regardless.     This contention, of course, has no merit, given that
    Chevoor's construction of the statute was explicitly rejected.
    And Phillipos develops no argument as to how some version of the
    "exculpatory no" lives on in the current version of section 1001.2
    2We note that the "exculpatory no" doctrine was, in many
    circuits, based on an implied materiality requirement that we --
    and many of our sister circuits -- read into the earlier version
    of section 1001. Brogan did away with the doctrine due to the
    absence of a textual basis for it in an earlier version of section
    1001. See 
    Brogan, 522 U.S. at 400
    (construing version of section
    1001 that applied broadly to "any false, fictitious, or fraudulent
    statement" (quoting 18 U.S.C. § 1001(a)(2) (1988 ed.))). In 1996,
    however, Congress added the statute's current materiality
    requirement for the express purpose of resolving the "conflict
    among circuits as to whether materiality is an element" of the
    false statements prohibition. H.R. Rep. No. 104-680, at 8 (1996).
    Several of our sister circuits have since held, albeit with little
    analysis, that Brogan precludes application of the "exculpatory
    - 24 -
    In any event, for the same reasons that a jury could
    reasonably find material the statements by Phillipos that we
    discussed above about who did or did not enter the lead suspect's
    dormitory room and take evidence from his backpack shortly after
    the   bombing    occurred,   a   jury    also   could   reasonably     reject
    Phillipos's contention that such statements were not meant "to
    fabricate a story or send agents on a wild goose chase."                 See
    
    Mehanna, 735 F.3d at 55
    ("[W]here a defendant's statements are
    intended to misdirect government investigators, they may satisfy
    the materiality requirement of section 1001 even if they stand no
    chance   of     accomplishing    their     objective.").       Thus,     this
    sufficiency challenge fails as well.
    B.
    Phillipos next trains his focus on the fact that section
    1001 applies to only those false statements and representations
    that an individual makes knowingly and willfully.               18 U.S.C.
    § 1001(a).      Phillipos contends that, even if he violated the
    statute, the government failed to present sufficient evidence that
    he did so with the requisite mens rea.          We disagree.
    no" doctrine under the amended statute, notwithstanding that it
    contains an express materiality requirement. See, e.g., United
    States v. Watkins, 
    691 F.3d 841
    , 852 (6th Cir. 2012); United States
    v. Ali, 
    508 F.3d 136
    , 153 (3d Cir. 2007).
    - 25 -
    The Supreme Court has made clear that "in order to
    establish a 'willful' violation of a statute, 'the Government must
    prove that the defendant acted with knowledge that his conduct was
    unlawful.'"     Bryan v. United States, 
    524 U.S. 184
    , 191-92 (quoting
    Ratzlaf   v.    United   States,   
    510 U.S. 135
    ,   137   (1994)).     But
    "[w]illfulness can rarely be proven by direct evidence, since it
    is a state of mind."      United States v. Bank of New Eng., N.A., 
    821 F.2d 844
    , 854 (1st Cir. 1987).           As such, willfulness is "usually
    established     by   drawing   reasonable     inferences      from   available
    facts."   
    Id. With respect
    to the false statements in Count Two, which
    Phillipos made during the April 25 interview, there would have
    been no need for the jury to infer much.            The interviewing agent
    testified at trial that he affirmatively told Phillipos that
    Phillipos could be prosecuted for making false statements.               This
    direct evidence suffices to support a jury's finding that section
    1001's willfulness requirement had been met.
    The government did not present similarly direct evidence
    with respect to the statements at issue in Count One, which
    Phillipos made during the April 20 interview.           But, the government
    notes, by April 20 -- five days after the Boston Marathon bombing
    occurred -- Phillipos, along with his friends, had become the focus
    of intense law enforcement interest due to their relationship with
    - 26 -
    Tsarnaev.       And, Phillipos had already been interviewed by law
    enforcement the previous day, on April 19.
    A    jury    could   reasonably     infer    that     someone    who
    potentially had information about the removal and destruction of
    evidence in a historic terrorism investigation into a deadly attack
    on a symbolic event, and who was interviewed by federal law
    enforcement agents twice, would know that it was unlawful to make
    false   statements      to   investigators    about   what   he   knew.      The
    reasonableness of this inference is further bolstered by the fact
    that, on April 20, Phillipos's interviewer told him that "now [was]
    the time to tell [the government]" what he knew.             The interviewer
    also asked whether "this was the story he want[ed] to go with" and
    gave Phillipos the opportunity to "correct" it.                 We thus reject
    this challenge.
    C.
    Finally,     Phillipos    contends    that    section     1001    is
    unconstitutionally vague as applied to the five false statements
    that he was convicted of making.        He argues that, by virtue of the
    express materiality requirement that section 1001 now contains, it
    is not clear which statements fall under section 1001 and which do
    not.    But this argument, too, is unavailing.
    A criminal statute is void for vagueness only if it
    "fails to provide a person of ordinary intelligence fair notice of
    what is prohibited, or is so standardless that it authorizes or
    - 27 -
    encourages seriously discriminatory enforcement."                  United States
    v. Williams, 
    553 U.S. 285
    , 304 (2008).                Applying section 1001's
    materiality standard to Phillipos's statements raises no such
    concerns.    A criminal statute is not unconstitutionally vague
    merely because it sets forth a standard for determining liability
    that is not mathematically precise.                 And here, the challenged
    standard -- "materiality" -- is a familiar one.                   Indeed, "[i]ts
    use in the context of false statements to public officials goes
    back as far as Lord Coke" in 1680.                Kungys v. United States, 
    485 U.S. 759
    , 769 (1987).
    Moreover,   Mehanna   laid    out       a    test   for   determining   when
    statements are material under section 1001 that used the same
    language as the test that had been set forth decades before in
    Kungys, which itself tracked the "uniform understanding of the
    'materiality' concept" that "federal courts have long displayed."
    See 
    Kungys, 485 U.S. at 770
    .             Under that standard, as we have
    explained, the evidence was more than sufficient to permit a
    reasonable jury to find the materiality requirement was satisfied
    as   to   each   count.   Thus,    we    reject       Phillipos's    as-applied,
    constitutional vagueness challenge.
    IV.
    In light of the foregoing, we affirm.
    - 28 -