United States v. Velarde ( 2007 )


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  •                                                                       F I L E D
    United States Court of Appeals
    Tenth Circuit
    PUBLISH
    May 1, 2007
    UNITED STATES CO URT O F APPEALS               Elisabeth A. Shumaker
    Clerk of Court
    TENTH CIRCUIT
    U N ITED STA TES O F A M ER ICA,
    Plaintiff-Appellee,
    v.                                               No. 06-2126
    M EL LAM BERT V ELARDE,
    Defendant-Appellant.
    A PPE AL FR OM T HE UNITED STATES DISTRICT COURT
    FOR T HE D ISTRICT OF NEW M EXICO
    (D .C . N O. C R N o. 98-391 LH )
    M arc M . Lowry (Peter Schoenburg with him on the briefs), Rothstein, Donatelli,
    Hughes, Dahlstrom, Schoenburg & Bienvenu, LLP, Albuquerque, New M exico,
    for Defendant-Appellant.
    J. M iles Hanisee, Assistant United States Attorney (David C. Iglesias, United
    States Attorney, with him on the brief), Albuquerque, New M exico, for Plaintiff-
    Appellee.
    Before HA RTZ, A ND ER SO N, and M cCO NNELL, Circuit Judges.
    M cCO NNELL, Circuit Judge.
    M el Velarde, who was convicted of sexually abusing a minor within Indian
    country, has filed a motion for a new trial under Rule 33(b) of the Federal Rules
    of Criminal Procedure. He claims that the government violated his rights under
    Brady v. M aryland, 
    373 U.S. 83
     (1963), by suppressing evidence that L.V., the
    minor victim, falsely accused her school teacher and vice principal of
    inappropriate touching. Velarde argues that had the government disclosed this
    evidence, he could have impeached L.V. at trial, and the result of his trial would
    have been different.
    The district court initially scheduled an evidentiary hearing at which M r.
    Velarde would have been able to subpoena certain otherwise uncooperative
    witnesses and determine the nature of L.V.’s false accusations, if that is what they
    were, and establish whether the government was aware of them. Later, however,
    the court sua sponte cancelled the evidentiary hearing and denied M r. Velarde’s
    motion for a new trial on the ground that he had failed to introduce admissible
    evidence in support of his Brady claim. W e hold that the district court erred by
    denying M r. V erlarde’s motion without granting an opportunity for discovery.
    W e therefore VACATE the district court’s order and REM AND for further
    proceedings consistent with this opinion.
    FA C TS A N D PROCEDURAL HISTORY
    1.     The Jury Trials and R ule 33 M otion
    In M arch 1999, M el Velarde was convicted by a jury of sexually abusing a
    minor within Indian country in violation of 
    18 U.S.C. §§ 1153
    , 2241(c),
    2246(2)(A). L.V., the alleged minor victim, is the daughter of the w oman M r.
    -2-
    Velarde was dating at that time. No one else saw the alleged crime, and there was
    no corroborating medical evidence, so M r. Velarde was convicted almost entirely
    on L.V.’s testimony. M r. Velarde appealed his conviction and this Court
    reversed, holding that the district court erroneously admitted expert testimony
    concerning L.V.’s propensity for truthtelling. United States v. Velarde, 
    214 F.3d 1204
    , 1210–11 (10th Cir. 2000).
    The government elected to retry M r. Velarde. During his second trial,
    which occurred in September 2001, L.V. testified that M r. Velarde took her from
    the top bunk of her brothers’ bed (her younger brother was also sleeping in the
    top bunk, and her older brother was sleeping in the lower bunk) into the hallway
    and held her mouth shut while he “tried to stick his private part in [her] private
    part.” R. V ol. III, at 255. M r. V elarde’s theory of the case was that L.V.
    fabricated those allegations to get back at him because when he spent the night at
    her mother’s house he displaced L.V. from her mother’s bed, L.V.’s usual
    sleeping place. This second trial resulted in another conviction, which this Court
    affirmed. United States v. Velarde, 88 F. App’x 339 (10th Cir. 2004).
    In September 2004, three years after his second trial, M r. Velarde filed a
    motion under Rule 33(b)(1) of the Federal Rules of Criminal Procedure seeking a
    new trial. He alleged that the government violated his Brady rights by failing to
    disclose before his second trial evidence that was favorable to him and material.
    Specifically, M r. Velarde claimed that in the days immediately preceding his
    -3-
    second trial, L.V. falsely accused her school teacher and the school’s vice
    principal of inappropriately touching her. He asserted that, because the case
    hinged largely on w hether L.V .’s testimony was credible, evidence that L.V.
    falsely accused other men of inappropriate touching could have impeached L.V.
    and led to a different result.
    M r. Velarde learned of L.V.’s apparently false accusations from Phil
    Gallegos, another teacher at L.V.’s school who was L.V.’s teacher’s union
    representative. M r. Gallegos testified in an affidavit that he told FBI Agent Frank
    C him its about L.V .’s false accusations before Velarde’s second trial began. H e
    also testified that he “reminded Agent Chimit[s] of his legal obligation to fully
    disclose this type of evidence.” R. Vol. I, Doc. 334, Ex. A., at 2. The
    government countered with Agent Chimits’s affidavit testimony that he “did not
    at any time have a conversation with [M r. Gallegos] of the nature described in
    Defendant Velarde’s M otion,” nor did he know of L.V.’s second accusations from
    any other source prior to the second trial. R. Vol. I, Doc. 314, Ex. 1, at 2.
    2.     The District Court’s Response to M r. Velarde’s Brady M otion
    Faced with the contradictory Gallegos and Chimits affidavits, the district
    court set an evidentiary hearing. R. Vol. I, Doc. 349. The order stated that “[t]he
    Court’s initial task is to determine whether a conversation with the content
    described in the Gallegos affidavit, did or did not occur.” Id. at 4. The court
    ordered the parties to “be prepared to present substantive evidence as to the
    -4-
    specific content of a conversation between Gallegos and Chimits.” Id. at 5. The
    court also ordered M r. Velarde to present at the hearing “the substantive, strong,
    exculpatory, admissible evidence that he intends to present at trial, i.e., the ‘new
    evidence’ on which he has based his motion.” Id. at 7.
    Soon after the district court issued this order, M r. Velarde moved the court
    to issue subpoenas under Fed. R. Crim. P. 17(b) to compel the attendance of
    Gallegos, L.V., and L.V.’s principal, vice principal, and teacher. R. Vol. I, Doc.
    350, at 1. These witnesses were to be the source of the “substantive, strong,
    exculpatory, admissible” new evidence that the court ordered him to introduce.
    M r. Velarde contended that because the allegations implicated the school
    officials’ fitness for continued employment, subpoena power w as necessary to
    compel their cooperation.
    Approximately one week after M r. Velarde sought these subpoenas, and
    before the court took any action on his motion, the district court sua sponte
    vacated the evidentiary hearing. R. Vol. I, Doc. 351, at 1. The court stated that
    “[r]ather than proceed with a costly and time-consuming evidentiary hearing, as
    well as potentially with at least a portion of a new trial, the Court determines that
    it is prudent, at this juncture, to determine the ultimate admissibility of such
    evidence, if established.” Id. at 1–2. The court ordered the parties to brief
    whether the evidence would be admissible under Fed. R. Evid. 412 and “to appear
    -5-
    for legal arguments,” id. at 1, at “a strictly legal hearing” after the briefing was
    complete, id. at 3.
    The parties submitted briefs as directed and appeared for the “strictly legal
    hearing” at the appointed time. But when the hearing began, the district judge
    immediately asked defense counsel to give “a statement of exactly what the new
    evidence is that the defendant wishes to or claims to have found that justifies a
    new trial.” R. Vol. VI, at 2. Defense counsel offered what the district court later
    characterized as a “proffer,” R. Vol. I, Doc. 357, at 4, 6, based on conversations a
    paid defense investigator had with L.V.’s teacher and vice principal.
    According to defense counsel, L.V.’s teacher told the investigator that he
    was summoned to the principal’s office in the week after September 11, 2001,
    where L.V. and her mother were present. He was asked, “W hat did you do to
    [L.V.], if [you] touched her inappropriately.” R. Vol. VI, at 5. He denied the
    charge. The principal then asked L.V. why she did not bring the incident to the
    attention of the vice principal. L.V. responded that she did not like the vice
    principal “because he touches me funny too.” Id. at 5–6. Her teacher w as told to
    leave the office, and he “never knew what happened afterwards.” Id. at 6.
    The investigator’s conversations with the vice principal largely concerned
    the school’s investigation into L.V.’s charges. The investigation involved the
    vice principal, a school counselor, and “others.” Id. at 6–7. Initially, the vice
    principal discussed the school’s investigation with the defense investigator. Id. at
    -6-
    6. He told the investigator “that nothing came of it, and that they didn’t think
    [L.V.] was telling the truth.” Id. at 6. Later, however, he clammed up, stating
    that “he couldn’t recall.” Id. at 7. He provided no further information to the
    investigator. And the school counselor who the vice principal stated “would have
    handled this” told the defense investigator that “she had no recall of the
    investigation.” Id. at 9.
    The defense subpoenaed the school records, but according to defense
    counsel, “there is [sic] no records to be had” because they are purged on an
    annual basis. Id. at 7.
    Defense counsel informed the district court that the defense wished to
    present the testimony of L.V.’s teacher and the defense investigator, and wished
    to subpoena the vice principal and the principal, Bill Reese. He explained to the
    court that “the underlying allegations of inappropriate touching are admissible, as
    well as M r. Gallegos’ testimony that he, in fact, informed Agent Chimits about
    the allegations.” Id. at 8. In further discussion with the district court, defense
    counsel stated that the admissible evidence the defense would present relates to
    “[the teacher’s] comments, M r. Reese’s discussion with the mother, and the
    victim, and [the vice principal],” as well as “the investigation, if any, [that] was
    done by [the vice principal].” Id. at 8–9.
    The district court attempted to pin down the defense regarding the exact
    nature of L.V.’s allegations against her teacher:
    -7-
    M R. LOW RY: [L.V.’s teacher]— and this is in [the investigator’s]
    report— said that when the principal, Bill Reese, asked her, she
    responded— [the teacher] recalls LV saying, “Because he scares me,”
    referring to [the vice principal].
    And then, when M r. Reese asked, “W hy does he scare you,” she
    added, “He touches me.”
    TH E C OU RT: Well, the first time you stated that you said, “He
    touches me funny.”
    M R. LOW RY: W ell, I apologize. This is what I have in actual quotes
    from—
    THE COURT: “He touches me.”
    M R. LOW RY: “He touches me.”
    THE COURT: And you don’t know where?
    M R. LOW RY: No, Your Honor. But this was [L.V.]’s explanation to the
    principal about why she was afraid to go to the vice-principal to report the
    allegations against [her teacher].
    *   *   *    *   *
    THE COURT: [W hat is L.V.’s teacher’s] testimony going to be? And
    that’s what you have to tell me. And what you’ve told me, the way I
    understand it, was that it was inappropriate touching.
    M R. LOW RY: [The teacher] wasn’t privy to the conversation that
    took place in the principal’s office before he arrived. W hat [the
    teacher] knows was that he was summoned into that office.
    THE COURT: W ell, who is going to testify what kind of touching it
    was, and what will that testimony be? W hat I’ve understood from
    you— and that’s what I asked you for— and what I have understood
    from you is that [L.V.’s teacher] touched her inappropriately.
    M R. LOW RY: And I think that we have to make that assumption,
    given what we know. And I think, if we want [a] more particularized
    description, it would take—
    -8-
    THE COURT: If you’re going to give me any more particular a
    description, it’s got to be now. This case was filed in 1998, and it’s
    now [2006], and I’m going to get rid of this case one way or the
    other, okay? So you have to tell me exactly what— how the touching
    was described, and who is going to say that.
    Id. at 9–10, 19–20.
    Defense counsel explained to the district court why it was necessary to
    subpoena witnesses in order to obtain the details regarding L.V.’s accusation:
    M R. LOW RY: I want to step back for just a second and address the
    underlying allegations, and you wanted more specificity, and I
    wholeheartedly understand why. But I want to address the context
    within which we’re talking about— we’re talking about school
    officials, teachers, in an environment that they deal directly on a day-
    to-day basis with children. And these individuals, to say that they
    are concerned is understated. But an allegation of sexual touching is
    sort of a death knell to a career for a teacher—
    THE COURT: I understand that.
    M R. LOW RY: — or a school official. At the onset, we’re dealing
    with a huge psychological barrier for people to even discuss with us
    the nature of touching, as it were. So I’m trying to be fully candid
    with Your Honor, but I also want the Court to be well aware of the
    circumstance that we’re dealing with. And it makes it exceedingly
    difficult to get, you know, highly descriptive, especially
    self— perhaps self-discriminating descriptions of touching. So I just
    wanted to place that in context for the Court.
    Id. at 32–33.
    Following the hearing, the district court issued a w ritten order denying M r.
    Velarde’s Rule 33 motion on the ground that “the Defendant’s ‘newly discovered
    evidence’ is not admissible.” R. Vol. I, Doc. 357, at 6. First, the district court
    concluded that the Gallegos affidavit did not contain reliable or admissible
    -9-
    evidence, largely because it was “based on hearsay.” Id. Nor did “the proffer by
    defense counsel at the M arch 15 hearing” provide “any admissible evidence” that
    L.V. had falsely accused her teacher and vice principal of inappropriate touching.
    Id. The court explained:
    There is no proof before the Court as to whether L.V. indeed accused [her
    teacher] of an inappropriate touching. W hat is in the record is that [her
    teacher] denied touching her inappropriately. W hile there is evidence that
    L.V. states that [her vice principal] “touches me,” there is no evidence that
    the accusation is false. Further, there is no proof before the Court as to
    whether or not L.V. accused [her teacher] and/or [her vice principal] of
    inappropriate touching of a sexual nature.
    Id. at 7.
    Second, the district court concluded that “[e]ven if Defendant’s evidence
    were more complete and stronger,” it lacked probative value for M r. Velarde’s
    defense “because the circumstances of the two incidents differ so substantially.”
    Id. at 7. Not only did the alleged incident at school occur two to three years after
    the incident charged in the indictment, but “these alleged accusations against
    [L.V.’s teacher] and [vice principal] involved unspecified types of touching that
    have yet to be described to the Court. There is certainly no proof that these other
    alleged incidents were of a sexual nature.” Id. The court observed that “[t]he
    alleged [teacher/vice principal] incidents could have consisted of a touching such
    as shove or other minor assault.” Id. at 7.
    The court then analyzed the proffered evidence under Federal Rules of
    Evidence 608(b) and 403 and the Confrontation Clause. Extrinsic evidence was
    -10-
    not admissible under Rule 608(b), according to the court, because it involved a
    collateral mater: “The lack of similarity of the events surrounding the prior and
    present allegations, and the slight degree of probative value of the proffered
    evidence on issues that are not collateral, such as L.V.’s credibility, bias, interest
    and motives, prompt the Court to exercise its discretion under Rule 608(b) and
    find the proffered evidence is inadmissible.” Id. at 8–9. The court also found
    that “the relevance and probative value of this evidence is extremely slight and
    the danger of confusion and prejudice is great,” leading the court to exclude it
    under R ule 403. Id. at 9. Finally, the court rejected the defendant’s argument
    that he has a right to admission of this evidence under the Confrontation Clause
    on the ground that it “is too attenuated in terms of what type of touching and in
    terms of time, to be probative,” and because “there is no proof before the Court
    that the statement ‘he touches me’ is false.” Id. at 10. The court concluded:
    Defendant’s evidence falls far short of showing a scheme of fabrication by
    L.V. Certainly this evidence is not relevant to show false accusations of a
    similar nature, with the same intent, motivation and plan or to establish
    possible biases, prejudices, or ulterior motive of L.V., which are “always
    relevant as discrediting the w itness and affecting the w eight of [her]
    testimony.” Davis v. Alaska, 
    415 U.S. 308
    , 316 (1974).
    Id. at 10 (alteration in original).
    M r. Velarde now appeals from that order.
    -11-
    D ISC USSIO N
    A defendant who seeks a new trial under Rule 33 based on an alleged Brady
    violation must show that “(1) the prosecution suppressed evidence, (2) the
    evidence was favorable to the defendant, and (3) the evidence was material.”
    United States v. Quintanilla, 
    193 F.3d 1139
    , 1149 & n.10 (10th Cir. 1999). The
    government has not contested that M r. Velarde would satisfy the second element,
    so w e lim it our inquiry to the first and third elements. W e review de novo the
    district court’s ruling on M r. Velarde’s Rule 33 motion because it alleges a Brady
    violation. United States v. Pearl, 
    324 F.3d 1210
    , 1215 (10th Cir. 2003).
    A. Did the prosecution suppress potentially exculpatory evidence?
    “Due process mandates disclosure by the prosecution of all evidence that
    favors the defendant and is ‘material either to guilt or punishment.’” Robinson,
    39 F.3d at 1118 (quoting Brady, 
    373 U.S. at 87
    ). This duty to disclose extends to
    prosecutors, police, and other government investigators. Kyles v. Whitley, 
    514 U.S. 419
    , 437–38 (1995). Accordingly, a defendant may base a Brady claim on a
    government investigator’s failure to disclose evidence material to guilt or
    punishment, even when the prosecutor personally did not know of that evidence.
    See 
    id.
    M r. Gallegos and Agent Chimits presented conflicting evidence to the
    district court regarding whether the prosecution suppressed potentially material
    evidence. The district court did not hold an evidentiary hearing to resolve this
    -12-
    conflict, but instead ruled that even if the government suppressed the information,
    M r. Velarde is not entitled to a new trial because the suppressed evidence would
    not have been admissible. For purposes of this appeal, therefore, we will assume
    (as the district court apparently did) that the defendant is correct that M r.
    Gallegos informed the government regarding L.V.’s supposed false accusations
    and that the government failed to provide this information to the defense. This
    question— whether suppression actually occurred— is, of course, open on remand.
    If, on remand, the district court concludes after an evidentiary hearing that
    Gallegos did not make the alleged statement to Chimits, there is no need for
    further proceedings to determine the materiality of the evidence.
    B. W as the petitioner entitled to discovery?
    Evidence is “material” under Brady “‘only if there is a reasonable
    probability that, had the evidence been disclosed to the defense, the result of the
    proceeding would have been different. A “reasonable probability” is a probability
    sufficient to undermine confidence in the outcome.’” United States v. Robinson,
    
    39 F.3d 1115
    , 1118 (10th Cir. 1994) (quoting United States v. Bagley, 
    473 U.S. 667
    , 682 (1985) (Blackmun, J.)). The district court denied M r. Velarde’s Rule 33
    motion on the ground that the evidence regarding L.V.’s supposed false
    accusations was neither admissible nor material. The court reached that
    conclusion, however, without considering whether defense counsel should be
    given leave to conduct discovery into the facts supporting M r. Gallegos’s
    -13-
    allegations. The case law in this area, as we discuss below, is obscure and
    apparently not well understood. The district court’s course of action— and
    defense counsel’s failure to point out the correct course more precisely— is
    therefore understandable. Nevertheless, we conclude that the court erred by
    failing to grant leave to conduct discovery.
    This case arises at the intersection of evidentiary hearings and fact
    discovery in the Rule 33 context. Our precedent speaks more frequently to the
    former and makes clear that a district court is “not required to hold” an
    evidentiary hearing before resolving a motion for a new trial, United States v.
    Sutton, 
    767 F.2d 726
    , 729 (10th Cir. 1985), particularly “when the record is
    complete or the petitioner raised only legal claims that can be resolved without
    the taking of additional evidence,” Lawrence v. Lensing, 
    42 F.3d 255
    , 259 (5th
    Cir. 1994) (internal quotation marks omitted), cited in Pearl, 
    324 F.3d at 1215
    .
    This is because “[t]he purpose of an evidentiary hearing is to resolve conflicting
    evidence.” Anderson v. Attorney Gen., 
    425 F.3d 853
    , 860 (10th Cir. 2005). As
    we stated in Anderson, “‘[w]hether the record raises a genuine factual issue
    [requiring an evidentiary hearing in a § 2254 proceeding] is decided by the same
    standards used to decide a Rule 56 motion for summary judgment.’” Id. (quoting
    East v. Scott, 
    55 F.3d 996
    , 1002 (5th Cir. 1995)) (brackets in original); see
    Blackledge v. Allison, 
    431 U.S. 63
    , 80 (1977). Thus, the court is required to
    conduct the evidentiary hearing only if the admissible evidence presented by
    -14-
    petitioner, if accepted as true, would w arrant relief as a matter of law . M r.
    Velarde does not satisfy that standard here because, by his own admission, he was
    unable to procure the necessary evidence from the school officials without
    judicial compulsion.
    In limited circumstances, however, a defendant who is unable to submit
    evidence to the court sufficient to warrant an evidentiary hearing, is able to make
    a showing that further investigation under the court’s subpoena power very likely
    would lead to the discovery of such evidence. In that rare case, what should the
    defendant do?
    The answer, we think, is to request leave to conduct discovery. Discovery
    is authorized in habeas corpus cases, an analogous post-conviction proceeding.
    See Blackledge, 
    431 U.S. at
    81–82, citing Rule 6 of the Rules Governing Habeas
    Corpus. Courts have authority to allow discovery based on the All W rits Act, 
    28 U.S.C. § 1651
    , a “legislatively approved source of procedural instruments
    designed to achieve the rational ends of the law” that “courts may rely upon . . .
    in issuing orders appropriate to assist them in conducting factual inquiries.”
    Harris v. Nelson, 
    394 U.S. 286
    , 299 (1969) (internal quotation marks and
    citations omitted). According to the Supreme Court, “where specific allegations
    before the court show reason to believe that the petitioner may, if the facts are
    fully developed, be able to demonstrate that he is” entitled to a new trial, “it is the
    duty of the court to provide the necessary facilities and procedures for an
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    adequate inquiry.” Id.; see also United States v. Wolfson, 
    413 F.2d 804
    , 808 (2d
    Cir. 1969) (in dictum, suggesting that Harris applies to Rule 33 motions); 26
    James W m. M oore et al., M oore’s Federal Practice § 633.21[3], at 633-50 (3d ed.
    2006). In fulfilling this duty, a district court has broad discretion to fashion
    discovery mechanisms suitable to the case before it. W e construe M r. Velarde’s
    request for the issuance of subpoenas in connection with the evidentiary hearing
    in this case as a request for discovery. 1
    Based on the record here, we conclude that M r. Velarde’s case fits in the
    rare class of cases described above. Defense counsel proffered affidavit evidence
    from M r. G allegos that, just a few days before M r. Velarde’s trial— at which L.V .
    accused Velarde of inappropriate touching— L.V. accused her teacher and vice
    principal of some (unspecified) form of inappropriate touching, that the school
    investigated the allegations, and that the investigation concluded that L.V. was
    lying. Defense counsel could not identify the precise nature of the “touching”
    because L.V.’s teacher was not informed of what he was accused; the vice
    principal, after initially discussing the school investigation with the defense,
    claimed not to remember any more; the principal would not talk to the defense;
    and the school records of the investigation had been destroyed. Defense counsel
    1
    Our decision to construe M r. Velarde’s m otion as a request for discovery is
    based on the particular context of this litigation, including the absence in this
    Circuit of an established practice of discovery in cases of this sort. In future
    cases, depending on the particular circumstances, a movant’s failure to request
    discovery may constitute a w aiver.
    -16-
    explained that further details about L.V.’s accusation and evidence of its falsity
    were known only to school officials who, for professional reasons, would discuss
    the matter only if compelled by subpoena power.
    If the evidence proffered by M r. Velarde’s counsel is accurate, it is more
    likely than not that L.V. in fact made allegations of inappropriate touching against
    her teacher and principal, and that the school investigated these allegations and
    found them false. Discovery in this case would therefore not be a mere fishing
    expedition based on the defendant’s mere hopes of finding exculpatory evidence.
    Rather, there is a firm evidentiary basis for believing such evidence likely exists.
    C. W as the evidence material under Brady?
    The question remains whether the exculpatory evidence would be material
    under Brady. The district court ruled as a matter of law that any evidence of
    alleged touching by school officials— the specifics of which were still
    unascertained— would be inadmissible under Rules 608(b) and 403 of the Federal
    Rules of Evidence. To a great extent, that ruling was reached on the basis of the
    evidence actually submitted by defense counsel, as opposed to the evidence that
    could be elicited through discovery. See R. Vol. I, Doc. 357, at 7 (“There is no
    proof before the Court as to whether L.V. indeed accused [her teacher] of
    inappropriate touching. W hat is in the record is that [he] denied touching her
    inappropriately. . . . Further, there is no proof before the Court as to whether or
    not L.V. accused [her teacher] and/or [her vice principal] of inappropriate
    -17-
    touching of a sexual nature.”) W hen determining whether to conduct discovery,
    however, the issue cannot be what the defense has already proved, but what the
    defense might reasonably be able to prove if discovery is conducted.
    The government argues that even if M r. Velarde were able to produce
    evidence that L.V. made false accusations of inappropriate touching against her
    teacher and vice principal, such evidence would be inadmissible at trial and its
    suppression therefore would not be a violation of Brady. In general, the Federal
    Rules of Evidence do not permit the introduction of evidence regarding collateral
    matters solely for the purpose of impeaching the credibility of a witness. Rule
    608(b) prohibits “prov[ing] by extrinsic evidence” a “specific instance[] of the
    conduct of a w itness, for the purpose of attacking or supporting the w itness’
    character for truthfulness.” Fed. R. Evid. 608(b). See White v. Coplan, 
    399 F.3d 18
    , 26 (1st Cir. 2005) (on habeas, concluding that prisoner was entitled to cross-
    examine complainants regarding prior accusations but noting that court is “not
    endorsing any open-ended constitutional right to offer extrinsic evidence”);
    United States v. Bartlett, 
    856 F.2d 1071
    , 1089 (8th Cir. 1988) (exclusion of
    extrinsic evidence of prior allegedly false allegation of rape is constitutional and
    proper under Rules 412 and 608(b)); Benn v. Greiner, 
    294 F. Supp. 2d 354
    , 365
    (E.D.N.Y. 2003) (W einstein, J.) (state court’s preclusion of prisoner’s cross-
    examination of victim regarding prior allegations of sexual abuse entitled him to
    habeas relief, but the state court “could . . . have precluded further inquiry or
    -18-
    extrinsic proof in order to avoid complicating the trial”), rev’d, 
    402 F.3d 100
     (2d
    Cir. 2005) (holding error was harmless). The reason for excluding such extrinsic
    evidence is to avoid mini-trials that may consume a disproportionate amount of
    time and confuse the issues. As the First Circuit explained in Ellsworth v.
    Warden, 
    333 F.3d 1
    , 8 (1st Cir. 2003) (en banc), “[t]he theory, simple enough, is
    that evidence about lies not directly relevant to the episode at hand could carry
    courts into an endless parade of distracting, time-consuming inquiries.”
    In United States v. M agallanez, 
    408 F.3d 672
     (10th Cir. 2005), on which
    M r. Velarde relies, we held that the government was properly allowed to call a
    rebuttal witness to contradict a false statement made by a witness on direct
    examination. Accordingly, if, on direct examination, L.V. were to testify that she
    had never made a false accusation of sexual abuse, M agallanez would support the
    introduction of the evidence (assuming it exists) regarding her false accusations
    against her teacher and vice principal. If, however, the issue did not arise on
    direct, the defense would be permitted to cross-examine her regarding the
    supposed false accusations at school, but M agallanez would not permit M r.
    Velarde to introduce extrinsic evidence regarding such accusations.
    To be sure, some authority supports admission of such extrinsic evidence,
    but it has not been accepted by this Circuit. One court in a habeas proceeding
    under 
    28 U.S.C. § 2254
     noted that the state court might allow such testimony, at
    least in some limited circumstances. Ellsworth, 
    333 F.3d at 4
    . In that case, the
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    defendant, who was accused of sexually molesting a boy at a residential treatment
    center, sought to introduce evidence that the boy had falsely accused caretakers at
    a prior care center of sexually molesting him. The First Circuit noted that New
    Hampshire allows extrinsic evidence of a prior false accusation of sexual assault
    if the prior accusation is similar to the new accusation and the defendant can
    show that the prior accusation was “demonstrably false.” 
    Id.
     (internal quotation
    marks omitted). And a federal district court, in an opinion affirmed in an
    unpublished circuit decision, allowed extrinsic evidence of three prior allegations
    that the complainant had admitted in writing to be false. See United States v.
    Stamper, 
    766 F. Supp. 1396
    , 1406 (W .D.N.C. 1991), aff’d sub nom. In re One
    Female Juvenile Victim, 
    959 F.2d 231
     (4th Cir. 1992) (unpublished decision)
    (appeal by witness only). 2
    M oreover, as M r. Velarde argues, there may be circumstances in which the
    Confrontation Clause would entitle a criminal defendant to introduce highly
    probative exculpatory extrinsic evidence. But if such constitutional exceptions
    exist, they are narrow. See Holmes v. South Carolina, 
    126 S. Ct. 1727
    , 1732
    (2006) (“W hile the Constitution . . . prohibits the exclusion of defense evidence
    under rules that serve no legitimate purpose or that are disproportionate to the
    ends that they are asserted to promote, w ell-established rules of evidence permit
    2
    In that case, the government, relying on Fed. R. Evid. 412, had conceded
    that the evidence would otherwise be admissible under Fed. R. Evid. 404(b) and
    608. See 
    766 F. Supp. at 1406
    .
    -20-
    trial judges to exclude evidence if its probative value is outweighed by certain
    other factors such as unfair prejudice, confusion of the issues, or potential to
    mislead the jury. . . . [T]he Constitution permits judges to exclude evidence that
    is repetitive, only marginally relevant or poses an undue risk of ‘harassment,
    prejudice, or confusion of the issues.” (citations, ellipsis, brackets, and internal
    quotation marks omitted)); United States v. Scheffer, 
    523 U.S. 303
    , 308 (1998);
    Ellsworth, 
    333 F.3d at 6
     (“[C]onfrontation clause objection is pretty well limited
    to extreme cases where the state restriction is patently unreasonable . . . .”);
    United States v. Gomes, 
    177 F.3d 76
    , 82 (1st Cir. 1999) (“[Confrontation Clause]
    challenge is tenable only where the restriction is manifestly unreasonable or
    overbroad.”). Neither this Court nor the Supreme Court has held that a defendant
    has a constitutional right to introduce extrinsic evidence under circumstances
    analogous to these.
    But we need not definitively resolve w hether extrinsic evidence of L.V.’s
    false accusations (assuming it exists and assuming it was withheld by the
    government) would be admissible on retrial. Even assuming such evidence would
    not be admissible, discovery could have led to facts that the defense could use to
    effectively cross-examine L.V. about her truthfulness. W hile Rule 608(b) makes
    this type of cross-examination subject to the district court’s discretion, it may
    well be an abuse of discretion not to allow such cross-examination in a criminal
    case w here the vast majority of inculpatory evidence is the alleged victim’s
    -21-
    testimony. See White, 
    399 F.3d at 26
     (on habeas, concluding that prisoner was
    entitled to cross-examine complainants regarding prior accusations); Benn, 
    294 F. Supp. 2d at 365
     (state court’s preclusion of prisoner’s cross-examination of
    victim regarding prior allegations of sexual abuse entitled him to habeas relief,
    but the state court “could . . . have precluded further inquiry or extrinsic proof in
    order to avoid complicating the trial”), rev’d, 
    402 F.3d 100
     (2d Cir. 2005)
    (holding error was harmless); see also M athis v. Berghuis, 90 F. App’x 101, 107
    (6th Cir. 2004) (unpublished decision) (affirming conditional grant of habeas
    relief to state prisoner based on possibility of cross-examination of complainant
    regarding prior rape allegations even though the applicable rule of evidence “does
    not generally permit” extrinsic evidence on the issue).
    W e believe those holdings are applicable here. L.V.’s testimony was
    virtually the only evidence of M r. Velarde’s guilt, and the fact (if it is a fact) that
    near the time of trial she made similar false accusations against two other men
    creates a reasonable probability that, had the defense known of this evidence, the
    result of the proceeding would have been different. If, under the circumstances, it
    would have been an abuse of discretion for the district court to preclude the
    defense from cross-examining L.V. about these prior false accusations, it is a
    Brady violation for the government to withhold from the defense the information
    on which it would conduct such a cross-examination.
    -22-
    W e reiterate, however, that if the court on remand w ere to conduct an
    evidentiary hearing to resolve the conflict in testimony between FBI Agent
    Chimits and M r. Gallegos, and conclude that the government did not suppress the
    information regarding L.V.’s supposed false accusations, the Brady question
    could be resolved on the first prong of the analysis, without need for discovery.
    C ON CLU SIO N
    W e VACATE the district court’s order denying M r. Velarde’s Rule 33
    motion and REM AND for proceedings consistent with the Brady analysis outlined
    above. W e do not hold that M r. Velarde is entitled to a new trial. W e hold only
    that, on this record, the district court erred in holding that the suppressed
    evidence was immaterial without first either resolving the disputed question
    regarding whether the government suppressed information regarding L.V.’s
    supposed false accusations at school or allowing discovery to determine the
    nature and veracity of L.V.’s supposed accusations against her teacher and vice
    principal. The district court has broad discretion to determine the type and manner
    of any discovery.
    -23-