State v. Valdez , 2021 UT App 13 ( 2021 )


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    2021 UT App 13
    THE UTAH COURT OF APPEALS
    STATE OF UTAH,
    Appellee,
    v.
    ALFONSO MARGO VALDEZ,
    Appellant.
    Opinion
    No. 20181015-CA
    Filed February 11, 2021
    Second District Court, Ogden Department
    The Honorable Joseph M. Bean
    No. 171901990
    Emily Adams, Cherise M. Bacalski, and
    Freyja Johnson, Attorneys for Appellant
    Sean D. Reyes and John J. Nielsen,
    Attorneys for Appellee
    JUDGE RYAN M. HARRIS authored this Opinion, in which
    JUDGES GREGORY K. ORME and JILL M. POHLMAN concurred.
    HARRIS, Judge:
    ¶1      A jury convicted Alfonso Margo Valdez of kidnapping,
    robbery, and aggravated assault, after his ex-girlfriend (Ex-
    Girlfriend) testified that he forced her into his car with a gun,
    threatened her, hit her with the gun, cut her face with a knife,
    and stole her purse and phone. Valdez appeals his convictions,
    claiming that the trial court incorrectly—and in violation of the
    Fifth Amendment to the United States Constitution—allowed
    the State to imply guilt from Valdez’s refusal to provide the
    swipe code to unlock his cell phone. Valdez also asserts that his
    attorney rendered ineffective assistance and that the court
    improperly excluded a witness’s testimony. We find merit in
    State v. Valdez
    Valdez’s Fifth Amendment argument, reverse his convictions on
    that basis, and remand for further proceedings.
    BACKGROUND 1
    ¶2      Valdez and Ex-Girlfriend dated and cohabited for a time
    in 2017 and, as Ex-Girlfriend recounted it, their relationship was
    a volatile one. She described Valdez as accusatory and violent,
    sometimes hitting and choking her, other times confining her in
    a locked room and once beating her so severely that her injuries
    required hospitalization. After their relationship ended, Ex-
    Girlfriend moved out of Valdez’s apartment, but Valdez
    continued to contact her via phone and text message. Ex-
    Girlfriend maintained that, after they parted ways, she largely
    tried to keep her distance from Valdez but acknowledged that
    she had willingly seen him “a couple times” after their breakup,
    but before the incident at issue here occurred.
    ¶3     About two months after their relationship ended, Valdez
    sent Ex-Girlfriend a text message telling her he had some mail to
    give her and asking her to meet him. Although Ex-Girlfriend had
    concerns about meeting Valdez, she thought it was “nice of him”
    to reach out for the purpose of passing along her mail, and she
    “had hope” that their meeting “would be decent.” Ex-Girlfriend
    told Valdez to meet her early one morning near her workplace
    after she finished her night shift. When Valdez pulled up in an
    SUV, Ex-Girlfriend approached the passenger side of the vehicle.
    She later testified that when she leaned into the open passenger-
    side window to speak to Valdez, he pulled out a revolver and
    1. “When reviewing a jury verdict, we examine the evidence and
    all reasonable inferences in a light most favorable to the verdict,
    reciting the facts accordingly.” State v. Painter, 
    2014 UT App 272
    ,
    ¶ 2, 
    339 P.3d 107
     (quotation simplified).
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    State v. Valdez
    told her to get in the car. Frightened, she complied, and Valdez
    began driving.
    ¶4      After Ex-Girlfriend got in the vehicle, Valdez told her
    “how stupid [she] was” for agreeing to meet him before saying,
    “I hope you have talked to your kids today, because you are not
    going to get away from me this time.” Valdez also pulled out a
    twelve-inch knife, which he wedged, blade pointed upward,
    between Ex-Girlfriend and the vehicle’s center console. Ex-
    Girlfriend testified that, as Valdez drove, he held the gun in his
    left hand, hit her in the head with it, and struck her “several
    times in the head and face” with his other hand. He also
    demanded that she give him her phone and purse, which she
    did, and that she take off her clothes, a demand she perceived as
    an attempt to prevent her from escaping. Other than beginning
    to unlace her shoes, she did not remove her clothing.
    ¶5     At one point, while the vehicle was stopped, Valdez
    dislodged the knife and ran it down Ex-Girlfriend’s face, cutting
    her lip. Ex-Girlfriend testified that, soon thereafter, she went into
    “survival mode,” and began attempting to get out of the vehicle,
    an endeavor Valdez impeded by putting his hand around her
    throat and holding on to her hair. Eventually, Ex-Girlfriend was
    able to spin out of Valdez’s grip, open the car door, and exit the
    vehicle. She then ran toward nearby houses, first knocking on a
    door and receiving no answer, and then attempting to flag down
    a passing vehicle. Finally, Ex-Girlfriend noticed a woman
    (Witness) standing on a nearby front porch and made her way
    toward that house.
    ¶6     Ex-Girlfriend explained to Witness that she was trying to
    escape from Valdez, and that Valdez had a knife and a gun and
    was trying to kill her. Ex-Girlfriend did not mention any injuries,
    and Witness did not see any blood on Ex-Girlfriend. Witness
    called the police, and a detective (First Detective) soon arrived
    and took statements from both Witness and Ex-Girlfriend. Much
    of First Detective’s encounter with Witness and Ex-Girlfriend
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    State v. Valdez
    was recorded on First Detective’s body camera. Witness told
    First Detective that she had seen Valdez’s vehicle stop in front of
    her house, and she could tell that Valdez and Ex-Girlfriend were
    arguing but could not see a knife or gun. During her trial
    testimony, Witness described watching the vehicle drive a few
    houses down the street, and observing Ex-Girlfriend apparently
    trying to get out of the vehicle, with her legs hanging out of the
    car; from Witness’s vantage point, it appeared that Valdez was
    attempting to prevent Ex-Girlfriend from leaving the vehicle. A
    few hours later, another detective (Second Detective)
    interviewed Ex-Girlfriend at the police station; this interaction
    was also recorded.
    ¶7     The next day, police arrested Valdez and seized, among
    other things, an Android phone discovered on his person at the
    time of his arrest. Police later obtained a warrant to search the
    phone, but were unable to access its contents because they did
    not know the code to unlock the phone, which in this case was a
    “swipe code,” a “nine dot pattern.” According to the officer
    assigned to try to access the phone’s contents, this particular
    phone would “only allow so many attempts” to unlock it “before
    completely locking you out of the phone or wiping or resetting
    the device and losing all of the data.” After obtaining a warrant
    to search the phone, officers asked Valdez “for his pass code”
    and explained that if he did not provide it then they would
    attempt “maneuver[s]” with the phone that could “destroy[]” it.
    An officer testified that Valdez “refused to give [him] the pass
    code and just told [him] to destroy the phone.” Officers were
    ultimately unable to access the phone’s contents.
    ¶8     After investigation, the State charged Valdez with
    aggravated assault, aggravated kidnapping, and aggravated
    robbery. The case first proceeded to a jury trial in August 2018,
    but the court declared a mistrial when the State’s first witness—
    Ex-Girlfriend—told the jury, in contravention of a pretrial order,
    that Valdez had previously spent time in prison. About two
    months later, a new jury was empaneled and a second trial was
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    State v. Valdez
    held; this trial spanned five trial days and included testimony
    from eleven witnesses.
    ¶9      In the second trial, the State called as its first witness First
    Detective, who gave a lengthy and detailed narrative account of
    his interaction with Ex-Girlfriend at Witness’s house on the day
    of the incident. After First Detective offered his observations of
    Ex-Girlfriend’s appearance—that she had a small cut on her top
    lip and a broken hair clip, but no other apparent injuries—the
    prosecutor asked him whether Ex-Girlfriend had “provide[d]
    any details about how [the] kidnapping had occurred.” First
    Detective answered in the affirmative, and spent the next five
    transcript pages describing in narrative fashion what Ex-
    Girlfriend had said to him about her encounter with Valdez. As
    First Detective began to describe Ex-Girlfriend’s account of how
    she escaped from Valdez’s vehicle, Valdez’s attorney lodged a
    hearsay objection, stating that First Detective’s testimony may
    have “fit within an [exception] up until this point,” but that his
    description of her escape from the vehicle was no longer
    “showing any effect on this officer and how he conducted the
    investigation.” The court overruled the objection, explained to
    the jury that the testimony was admissible “under a hearsay
    exception where it tells us why the officer acted in his
    investigation the way he did,” and instructed the jury that First
    Detective’s testimony in this vein was not to be considered “for
    the truth of the matter asserted.” First Detective then completed
    his narrative description of what Ex-Girlfriend had told him,
    taking another two pages of trial transcript to do so. First
    Detective also described his interaction with Witness, but in
    much less detail.
    ¶10 After First Detective’s testimony, Witness and Ex-
    Girlfriend testified about the incident, as recounted above. The
    State also called two additional police officers, who—among
    other things—testified that police were never able to find Ex-
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    State v. Valdez
    Girlfriend’s phone or any knife, and located only a starter pistol, 2
    but no actual handgun, during a search of Valdez’s residence.
    ¶11 The State called Second Detective as its final witness. One
    of the other officers had already testified that police were unable
    to access the contents of Valdez’s phone, but had not described
    Valdez’s refusal to provide the swipe code. As Second Detective
    began describing Valdez’s refusal, Valdez’s attorney objected,
    asserting that Valdez had a “Fifth Amendment [r]ight” not to
    provide the swipe code, and that the State should not be able to
    present any evidence of Valdez’s refusal to provide it. The court
    overruled the objection, and allowed Second Detective to inform
    the jury that Valdez “refused to [provide] the passcode and just
    told [Second Detective] to destroy the phone.”
    ¶12 The State also asked Second Detective about interviewing
    Ex-Girlfriend at the police station, and it played for the jury a
    video recording of the entire interview. Second Detective
    testified, without objection, that he had received training on how
    to “detect deception” on the part of interviewees, and he
    explained that one of his techniques for detecting deception—
    and one that he used with Ex-Girlfriend in this case—was to ask
    the interviewee to tell his or her story in reverse. He explained:
    “If you can remember [your story] in reverse,” then it is “most
    likely, in [my] experience and training, . . . the truth.” And he
    further testified that, when he asked Ex-Girlfriend to give her
    account in reverse, she was able to do so in a “consistent”
    manner. On cross-examination, Second Detective acknowledged
    that, while it took Ex-Girlfriend forty-five minutes to tell her
    story chronologically, it took her only a minute or two to recap
    her account in reverse. Valdez’s attorney then asked Second
    Detective whether that one-minute reverse recap was “sufficient
    2. According to one of the testifying officers, a “starter pistol” is
    “a gun that shoots blanks” and is used to ceremonially mark the
    start of races; it is not capable of firing actual bullets.
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    State v. Valdez
    for [him] to validate everything that [Ex-Girlfriend] said,” and
    Second Detective responded in the affirmative.
    ¶13 On redirect examination, the State asked Second Detective
    if he expected the reverse telling to be as detailed as the original
    telling, and he explained that he did not. The State then asked
    him for his “assessment” of Ex-Girlfriend’s testimony, and he
    stated that he “believe[d] she was telling [him] the truth,” and
    that he reached that conclusion because her “story matched what
    she told [First Detective] on-scene,” “matched what she told
    [W]itness,” and “was consistent with” the account she gave in
    “reverse order.” After a few more questions, the State finished
    its redirect examination, and the court—without being
    prompted—asked counsel to approach the bench. After a sidebar
    discussion, the court issued a “corrective instruction,” explaining
    to the jury that evidentiary rules “bar[] the admission of
    . . . expert testimony as to the truthfulness of a witness on a
    particular occasion,” and prevent one witness from “vouch[ing]
    for the credibility of another.” The court struck Second
    Detective’s testimony “as far as saying that [Second Detective]
    believed the alleged victim in this matter was telling the truth,”
    and instructed the jury to “disregard . . . that specific part of
    [Second Detective’s] testimony as far as his belief that [Ex-
    Girlfriend] was telling the truth.” The court also later gave the
    jury a written instruction, stating as follows: “You are instructed
    to disregard the portion of the testimony of [Second Detective]
    that deals with his opinion of the truthfulness of the alleged
    victim in this case.”
    ¶14 After the State rested, Valdez moved for a mistrial on the
    basis that Second Detective, in describing his interview of
    Valdez, testified that he had read Valdez his Miranda 3 rights and
    that Valdez had thereafter refused to answer further questions.
    The court denied the motion, but offered to give an instruction
    3. Miranda v. Arizona, 
    384 U.S. 436
     (1966).
    20181015-CA                      7                
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    State v. Valdez
    informing the jury of a defendant’s right to remain silent.
    Valdez’s counsel then asked to “amend [his] motion to include
    . . . the statement of [Valdez] failing to comply with [the officers’]
    request to provide the code for the phone.” After hearing
    argument from the State, the court stated that “the Fifth
    Amendment does not necessarily protect” refusing to “giv[e] a
    pass code to a phone,” and that it was “inclined” to deny
    Valdez’s motion. However, the court did not make a definitive
    ruling, stating that it would “give [the matter] some thought”
    and invite further discussion on the issue “when we do jury
    instructions.” But neither the court nor the parties brought the
    matter up again, and the court never made a final ruling on
    Valdez’s “amend[ed]” motion for mistrial.
    ¶15 Valdez then called several witnesses of his own, although
    he elected not to testify himself. The first was his ex-wife (Ex-
    Wife), who lived next door to Valdez, in the same duplex, and
    shared a wall with him. During her testimony, Ex-Wife testified
    that the apartment walls were thin, and she never heard
    screaming, yelling, or any signs of trouble coming from Valdez’s
    apartment, even during the time that Ex-Girlfriend lived with
    Valdez; this testimony was corroborated by testimony from
    Valdez’s daughter, who lived with Ex-Wife. Ex-Wife also
    characterized Ex-Girlfriend as a “guest that never left” and was
    “hard to get rid of.” Ex-Wife was acquainted with Ex-Girlfriend
    not only because of their common association with Valdez, but
    also because she and Ex-Girlfriend worked for the same
    company. Ex-Wife testified that on the morning of the incident
    in question, while both of them were at work, Ex-Girlfriend had
    shown her a series of text messages between Valdez and herself
    that were “sexual” and appeared to indicate that the two of them
    wanted to “make[] up.”
    ¶16 Valdez also attempted to call his aunt (Aunt) to the stand.
    Aunt was prepared to testify that—contrary to Ex-Girlfriend’s
    assertions that she largely avoided Valdez after their breakup—
    Ex-Girlfriend had, in fact, often attempted to see Valdez in the
    20181015-CA                      8                 
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    State v. Valdez
    month leading up to the incident. Valdez proffered that Aunt
    could testify that, while Valdez was at Aunt’s house performing
    odd jobs after he and Ex-Girlfriend had broken up, Aunt had
    seen Ex-Girlfriend parked outside of the house waiting for
    Valdez, and that Ex-Girlfriend had done this uninvited. Valdez’s
    counsel argued that Aunt’s testimony was admissible pursuant
    to rule 608(c) of the Utah Rules of Evidence “to establish a bias”
    and “to establish that there may be a motive [for Ex-Girlfriend]
    to misrepresent her testimony of how terrified that she was.”
    Counsel made only the rule 608(c) argument, and did not assert
    that Aunt’s testimony was admissible as ordinary impeachment
    evidence. The trial court refused to allow Aunt to testify,
    rejecting counsel’s rule 608(c) argument.
    ¶17 After Valdez rested, the court instructed the jury. Valdez
    asked the court to provide instructions about lesser-included
    offenses regarding the aggravated kidnapping and aggravated
    robbery counts, but did not ask for a lesser-included-offense
    instruction with regard to the aggravated assault count. The
    court instructed the jury as Valdez requested.
    ¶18 During closing argument, the State emphasized (among
    other things) Valdez’s refusal to disclose the swipe code to his
    phone, and did so in connection with an attempt to rebut Ex-
    Wife’s testimony about the sexual text messages. Specifically, the
    prosecutor argued as follows:
    Now, you heard [Ex-Wife] say that she saw some
    texts. They were going to get back together and do
    sexual things. The State was very interested. You
    heard testimony from [several] witnesses about the
    efforts that were taken to get into [Valdez’s] phone
    to determine what, if any, communication
    happened between the two of them. . . . The only
    way [the State] could get into that phone to see
    what these text messages said was by getting the
    20181015-CA                     9               
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    State v. Valdez
    code from [Valdez]. And he chose to decline to do
    that.
    ....
    The [S]tate made and took a lot of effort to see
    what communications had gone on between them.
    Instead of providing any proof of text messages,
    they bring in . . . [Ex-Wife] to say that she, we
    didn’t have a good relationship with [Ex-
    Girlfriend], happened to see the text between them
    was of a sexual nature. Think of the motive she had
    to lie. Her investment in this case. Ladies and
    gentlemen, use your common sense. Those texts
    [aren’t 4] here today.
    ¶19 At the conclusion of the trial, the jury convicted Valdez of
    aggravated assault, but declined to convict him of aggravated
    kidnapping and aggravated robbery, instead convicting him of
    lesser-included offenses, namely, kidnapping and robbery.
    ISSUES AND STANDARDS OF REVIEW
    ¶20 Valdez now appeals, and asks us to consider several
    issues. We first address Valdez’s assertion that his rights under
    the Fifth Amendment to the United States Constitution were
    violated when the trial court allowed Second Detective to testify
    about Valdez’s refusal to provide the swipe code to his phone,
    and when the State argued therefrom that the jury should infer
    that there existed no “make up” texts between Valdez and Ex-
    Girlfriend. Because Valdez raises a constitutional claim, we
    4. The record reads, “Those texts (inaudible) here today.” From
    context, we infer that the inaudible phrase is “aren’t.”
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    State v. Valdez
    review the trial court’s conclusions for correctness. State v.
    Maestas, 
    2012 UT 46
    , ¶ 95, 
    299 P.3d 892
    .
    ¶21 In addition to his constitutional claim, Valdez raises
    several other issues. He claims that his attorney rendered
    constitutionally ineffective assistance of counsel in several
    respects, including when he (a) failed to object to Second
    Detective’s testimony pertaining to the veracity of Ex-
    Girlfriend’s statements, and (b) failed to object to the length and
    detail with which First Detective described the events leading to
    his investigation of the incident. And he claims that the trial
    court erred by refusing to allow Aunt to testify. Because we find
    merit in Valdez’s Fifth Amendment argument and reverse on
    that ground, we need not reach the merits of these other
    arguments, although we provide some limited guidance in the
    hope it may be useful on remand.
    ANALYSIS
    I.
    ¶22 We first address Valdez’s claim that his Fifth Amendment
    rights were violated when the State presented evidence that he
    refused to provide the swipe code to his cell phone, and then
    relied on that evidence in urging the jury to infer that there were
    no conciliatory and sexual text messages between Valdez and
    Ex-Girlfriend. We begin by engaging in a general discussion of
    governing Fifth Amendment legal principles. We then confront
    the particular question of whether communicating a cell phone
    swipe code to law enforcement is a “testimonial” act protected
    by the Fifth Amendment, and conclude that it is. Next, we
    analyze the applicability of the so-called “foregone conclusion
    exception” to testimoniality, and conclude that the exception
    does not apply in this case. We then determine that the State
    made more than an innocuous use of the evidence, and that the
    20181015-CA                    11                
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    State v. Valdez
    Fifth Amendment was therefore violated in this case. Finally, we
    conclude that the error was not harmless.
    A.    General Fifth Amendment Principles
    ¶23 The Self-Incrimination Clause of the Fifth Amendment to
    the United States Constitution provides that “[n]o person
    . . . shall be compelled in any criminal case to be a witness
    against himself,” and creates a privilege that protects a
    defendant “against being incriminated by his own compelled
    testimonial communications,” Doe v. United States, 
    487 U.S. 201
    ,
    207 (1988). This privilege was created “to prevent the use of legal
    compulsion to extract from the accused a sworn communication
    of facts which would incriminate him,” as had been done in
    historical “ecclesiastical courts and the Star Chamber,” where
    inquisitors would “put[] the accused upon his oath and compel[]
    him to answer questions designed to uncover uncharged
    offenses, without evidence from another source.” 
    Id. at 212
    . The
    amendment “reflects a judgment that the prosecution should not
    be free to build up a criminal case, in whole or in part, with the
    assistance of enforced disclosures by the accused.” 
    Id.
     (quotation
    simplified); see also Estelle v. Smith, 
    451 U.S. 454
    , 462 (1981)
    (noting that the government is typically required to gather
    evidence through “the independent labor of its officers, not by
    the simple, cruel expedient of forcing it from [a suspect’s] own
    lips” (quotation simplified)).
    ¶24 Many communications fall under the ambit of the Fifth
    Amendment’s protection, see State v. Gallup, 
    2011 UT App 422
    ,
    ¶ 14, 
    267 P.3d 289
    , but the Fifth Amendment does not protect
    defendants from disclosures of every kind, see Doe, 
    487 U.S. at 212
    . Rather, the amendment “protects a person only against
    being incriminated by his own compelled testimonial
    communications.” 
    Id. at 207
     (quotation simplified). Thus, courts
    have often stated that communications merit Fifth Amendment
    protection only if they share three characteristics: (1) the
    communication is compelled, (2) the communication is
    20181015-CA                    12                
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    State v. Valdez
    testimonial, and (3) the communication is incriminating. See
    Hiibel v. Sixth Judicial Dist. Court, 
    542 U.S. 177
    , 189 (2004) (stating
    that, in order for a communication to trigger Fifth Amendment
    protections, it “must be testimonial, incriminating, and
    compelled”); see also Commonwealth v. Davis, 
    220 A.3d 534
    , 543
    (Pa. 2019) (“To invoke the Fifth Amendment privilege against
    the forced provision of information, a defendant must show (1)
    the evidence is self-incriminating; (2) the evidence is compelled;
    and (3) the evidence is testimonial in nature.”), cert. denied, 
    141 S. Ct. 237
     (2020).
    ¶25 In this case—as in several similar cases, see, e.g., Doe, 
    487 U.S. at 207
    ; Davis, 220 A.3d at 543—the elements of compulsion
    and incrimination are not contested. The State implied at trial
    that Valdez had an obligation to provide the swipe code to the
    investigating officers, and that he had no right to refuse. And it
    has “long been settled that [the Fifth Amendment’s self-
    incrimination] protection encompasses compelled statements
    that lead to the discovery of incriminating evidence even though
    the statements themselves are not incriminating and are not
    introduced into evidence.” United States v. Hubbell, 
    530 U.S. 27
    ,
    37 (2000); see also 
    id. at 38
     (stating that the Fifth Amendment
    protects “against the prosecutor’s use of incriminating
    information derived directly or indirectly from the compelled
    testimony” of the defendant). Thus, even though the State might
    not have planned to introduce the actual swipe code into
    evidence, and even though the code was not itself evidence of a
    crime, that code could have led to the “discovery of
    incriminating evidence” on Valdez’s phone, and therefore is
    properly categorized as at least indirectly “incriminating” for
    Fifth Amendment purposes. See 
    id.
     at 37–38.
    ¶26 In this case, the only contested element is whether
    providing the swipe code to officers would have been
    “testimonial,” as that term is used in the Fifth Amendment
    context. The State contends that it would not or, at least, that an
    exception to testimoniality applies here. Valdez, by contrast,
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    State v. Valdez
    contends that any statement he might have made to police
    communicating the swipe code to them would have been
    testimonial in nature. We proceed to analyze these arguments.
    B.     Testimoniality
    ¶27 “[I]n order to be testimonial, an accused’s communication
    must itself, explicitly or implicitly, relate a factual assertion or
    disclose information.” Doe, 
    487 U.S. at 210
    . The “touchstone”
    used to mark whether a communication “is testimonial is
    whether the government compels the individual to use ‘the
    contents of his own mind’ to explicitly or implicitly
    communicate some statement of fact.” See In re Grand Jury
    Subpoena Duces Tecum Dated March 25, 2011, 
    670 F.3d 1335
    , 1345
    (11th Cir. 2012) (quoting Curcio v. United States, 
    354 U.S. 118
    , 128
    (1957)); see also Doe, 
    487 U.S. at 211
     (“It is the extortion of
    information from the accused, the attempt to force him to
    disclose the contents of his own mind, that implicates the Self-
    Incrimination Clause.” (quotation simplified)). “Whatever else it
    may include, the definition of ‘testimonial’ must encompass all
    responses to questions that, if asked of a sworn suspect during a
    criminal trial, could place the suspect in the cruel trilemma” of
    “self-accusation, perjury, or contempt.” See Pennsylvania v.
    Muniz, 
    496 U.S. 582
    , 596–97 (1990) (quotation simplified).
    ¶28 “The most common form” of testimonial communication
    “is verbal or written communications—the vast amount of which
    will fall within the privilege” provided by the Fifth Amendment.
    Eunjoo Seo v. State, 
    148 N.E.3d 952
    , 955 (Ind. 2020). Indeed, the
    United States Supreme Court has made clear that “[t]here are
    very few instances in which a verbal statement, either oral or
    written, will not convey information or assert facts,” and that
    therefore “[t]he vast majority of verbal statements thus will be
    testimonial.” See Doe, 
    487 U.S. at 213
    .
    ¶29 On the other hand, citizens may be compelled to take
    various nonverbal actions without implicating the Fifth
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    State v. Valdez
    Amendment’s Self-Incrimination Clause. See In re Grand Jury
    Subpoena, 
    670 F.3d at 1345
     (stating that “the Fifth Amendment
    privilege is not triggered where the Government merely compels
    some physical act, i.e. where the individual is not called upon to
    make use of the contents of his or her mind,” and where the
    State’s request amounts to something much more like a
    compelled hand-off of “the key to the lock of a strongbox
    containing documents”). For instance, “a suspect may be
    compelled to furnish a blood sample, to provide a handwriting
    exemplar or a voice exemplar, to stand in a lineup, and to wear
    particular clothing.” Doe, 
    487 U.S. at 210
     (quotation simplified);
    see also Hubbell, 
    530 U.S. at 35
    . In instances like these, the
    government does not seek access to a suspect’s mind, and the
    suspect by undertaking the action is “not required to disclose
    any knowledge he might have, or to speak his guilt.” See Doe,
    
    487 U.S. at 211
     (quotation simplified). Thus, nonverbal actions
    are often considered nontestimonial.
    ¶30 Likewise, “a person may be required to produce specific
    documents even though they contain incriminating assertions of
    fact or belief because the creation of those documents was not
    ‘compelled’ within the meaning of the [Fifth Amendment]
    privilege.” Hubbell, 
    530 U.S. at
    35–36; see also 
    id. at 36
     (stating that
    a person “could not avoid compliance with [a] subpoena served
    on him merely because the demanded documents contained
    incriminating evidence, whether written by others or voluntarily
    prepared by himself”). However, although voluntarily created
    documents are not themselves protected by the Fifth
    Amendment, its self-incrimination principles may be implicated
    when a suspect is asked to participate in the production of such
    documents, because “the act of production itself may implicitly
    communicate statements of fact” that the government may not
    already know, such as the fact that the documents “existed, were
    in his possession or control, and were authentic.” 
    Id. at 36
    (quotation simplified); see also Muniz, 
    496 U.S. at
    595 n.9
    (explaining that “nonverbal conduct contains a testimonial
    component whenever the conduct reflects the actor’s
    20181015-CA                       15                 
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    State v. Valdez
    communication of his thoughts to another”); Fisher v. United
    States, 
    425 U.S. 391
    , 410 (1976) (providing that the “act of
    producing evidence in response to a subpoena nevertheless has
    communicative aspects of its own, wholly aside from the
    contents of the papers produced”).
    ¶31 In his noteworthy dissenting opinion in Doe, Justice
    Stevens offered an example of the difference between a verbal
    testimonial communication and a nonverbal nontestimonial
    action, stating that a person “may in some cases be forced to
    surrender a key to a strongbox containing incriminating
    documents,” but that person cannot “be compelled to reveal the
    combination to his wall safe—by word or deed.” See 
    487 U.S. at 219
     (Stevens, J., dissenting). The majority opinion in Doe agreed
    with Justice Stevens’s formulation, stating that it did “not
    disagree with the dissent that ‘[t]he expression of the contents of
    an individual’s mind’ is testimonial communication,” but held
    that the act of “compulsion” at issue in that case “is more like
    ‘being forced to surrender a key to a strongbox containing
    incriminating documents’ than it is like ‘being compelled to
    reveal the combination to [a] wall safe.’” 
    Id.
     at 210 n.9 (majority
    opinion) (quoting 
    id. at 219
     (Stevens, J., dissenting)). And in
    Hubbell, in a majority opinion authored by Justice Stevens, the
    Supreme Court fully endorsed the combination safe/strongbox
    key distinction, holding that requiring a suspect to identify and
    assemble “the hundreds of documents responsive to the requests
    in [a] subpoena” was testimonial because it was “like telling an
    inquisitor the combination to a wall safe, not like being forced to
    surrender the key to a strongbox.” See Hubbell, 
    530 U.S. at
    43
    (citing Doe, 
    487 U.S. at
    210 n.9). Thus, according to the United
    States Supreme Court, a statement—by word or deed—
    communicating a combination to a wall safe is testimonial, but
    the act of handing over a key to a strongbox is nontestimonial.
    See Davis, 220 A.3d at 547 (“[T]he Supreme Court has made, and
    continues to make, a distinction between physical production
    and testimonial production.”).
    20181015-CA                    16                
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    State v. Valdez
    ¶32 There are several ways in which law enforcement officers
    might go about gaining access to a suspect’s locked cell phone,
    once a search warrant for that phone has been procured. Among
    them are these: (a) asking the suspect to communicate the access
    code to law enforcement officers, or (b) asking the suspect to
    personally unlock the phone, whether through biometric means
    (e.g., a fingerprint) or through entry of numbers or a swipe
    pattern, and then turn over the unlocked phone. In scenario (a),
    the suspect is asked to tell the officers what the code is, the
    officers learn that code, and may later enter the code into the
    phone themselves; in scenario (b), by contrast, the suspect is not
    asked to, and does not, communicate the code to law
    enforcement officers.
    ¶33 Scenario (a) is very much akin to revealing the
    combination to a wall safe, and is dissimilar from surrendering
    the key to a strongbox. See Hubbell, 
    530 U.S. at 43
    ; Doe, 
    487 U.S. at
    210 n.9. Indeed, while we are aware of no Utah law on this topic,
    various courts and commentators have recognized that, by
    asking a suspect to—orally or in writing—communicate the
    actual passcode to a cell phone, law enforcement officers seek a
    response that is testimonial in ways that simply turning over an
    unlocked phone is not, because such a request asks for the code
    itself. See, e.g., Davis, 220 A.3d at 548 (explaining that “the
    revealing of a computer password is a verbal communication,
    not merely a physical act that would be nontestimonial in
    nature,” and that “one cannot reveal a passcode without
    revealing the contents of one’s mind”); United States v. Kirschner,
    
    823 F. Supp. 2d 665
    , 669 (E.D. Mich. 2010) (noting that “forcing [a
    defendant] to reveal the password for the computer
    communicates that factual assertion to the government, and
    thus, is testimonial—it requires [a defendant] to communicate
    ‘knowledge,’ unlike the production of a handwriting sample or a
    voice exemplar” (quoting Doe, 
    487 U.S. at 217
    )); see also United
    States v. Spencer, No. 17-CR-00259-CRB-1, 
    2018 WL 1964588
    , at *2
    (N.D. Cal. Apr. 26, 2018) (stating that “the government could not
    compel [the defendant] to state the password itself, whether
    20181015-CA                     17                 
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    State v. Valdez
    orally or in writing,” but holding, on the facts of that case, that it
    could compel the defendant to unlock the phone); State v.
    Pittman, --- P.3d ----, 
    367 Or. 498
    , 510 (2021) (stating that “[t]he
    state could not compel defendant to reveal the passcode to the
    phone” because “[r]equiring her to do so would compel her to
    make an express verbal or written statement”); Laurent
    Sacharoff, What Am I Really Saying When I Open My Smartphone?
    A Response to Orin S. Kerr, 97 Tex. L. Rev. Online 63, 68 (2019)
    (debating whether the government can compel a suspect to turn
    over an unlocked phone, and not “whether the government can
    compel a suspect to orally state, or write down, her passcode,”
    because “[s]uch compulsion would violate the Fifth
    Amendment, as almost everyone including Kerr agrees”);
    Wayne R. LaFave et al., 3 Criminal Procedure § 8.13(a) (4th ed.
    2020) (stating that “requir[ing] the subpoenaed party to reveal a
    passcode that would allow [the government] to perform the
    decryption . . . would require a testimonial communication
    standing apart from the act of production”).
    ¶34 In this case, Second Detective testified that he explained
    to Valdez that he “had a search warrant” for the phone and that
    he “was asking for [Valdez’s] pass code,” and that Valdez
    responded by “refus[ing] to give [Second Detective] the pass
    code.” We acknowledge that, during trial, Second Detective was
    not directly queried about whether he asked Valdez to provide
    the government with the swipe code, or whether he merely
    asked Valdez to input the swipe code himself and hand over the
    unlocked phone; we also acknowledge that Second Detective did
    not specify whether he asked Valdez to provide the swipe code
    via verbal description or by writing it down on paper.
    Nevertheless, we think the best reading of the record is that
    Second Detective asked Valdez to tell him, by word or deed,
    what the swipe code was. Second Detective stated that he “asked
    for” the passcode, and that Valdez refused “to give [him] the
    pass code.” We therefore proceed with the understanding that
    scenario (a), above, applies here: that the government asked
    20181015-CA                      18                
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    State v. Valdez
    Valdez to provide the swipe code itself, and did not merely ask
    that Valdez unlock and then hand over his phone. 5
    ¶35 By making such a request, Second Detective asked Valdez
    to make an affirmative verbal statement, whether orally or in
    writing, that would have unquestionably been testimonial. To
    put it in Justice Stevens’s terms, the government was asking
    Valdez to provide the equivalent of “the combination to [his]
    wall safe,” a request that asked Valdez to reveal to the
    government the “contents of his own mind.” See Doe, 
    487 U.S. at
    210 n.9, 211 (quotation simplified). This “verbal statement,”
    whether it took oral or written form, would have “convey[ed]
    information or assert[ed] facts” to the State that it could have
    used to further its investigation and prosecution of Valdez. 
    Id. at 213
     (“The vast majority of verbal statements thus will be
    testimonial and, to that extent at least, will fall within the [Fifth
    Amendment’s] privilege.”); see also Davis, 220 A.3d at 548.
    Accordingly, the request the State made of Valdez asked for a
    response that would have been testimonial in nature.
    C.     The Foregone Conclusion Exception
    ¶36 The State does not strenuously resist the conclusion that
    the statement Valdez was asked to make was, at least to some
    degree, testimonial. Instead, it asserts that, even if the requested
    statement could be considered to have testimonial aspects, Fifth
    Amendment protections do not apply; the State contends that
    the statement Valdez was asked to make had “minimal
    testimonial significance” because the things the statement would
    have revealed were “foregone conclusions.” Stated another way,
    the State, citing Fisher, 
    425 U.S. at
    410–13, invokes what it refers
    5. Because the facts of this case fall within scenario (a), we apply
    the law to those facts, and express no opinion as to the outcome
    of a case that might later arise under scenario (b).
    20181015-CA                     19                 
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    State v. Valdez
    to as the “foregone conclusion exception” to testimoniality. In
    our view, the State misperceives the reach of this exception.
    ¶37 In Fisher, the Supreme Court was not concerned with a
    verbal communication. Id. at 409 (analyzing the testimoniality of
    the act of responding to “a documentary summons”). As noted,
    verbal statements almost always “convey information or assert
    facts” and are nearly always “testimonial.” See Doe, 
    487 U.S. at 213
    . But when the communication in question is the act of
    producing documents or other tangible goods, the question of
    testimoniality becomes much closer. See Fisher, 
    425 U.S. at
    410–
    13. As the Fisher court noted, even an act of production might
    have “communicative aspects of its own, wholly aside from the
    contents of the papers produced,” such as, for instance,
    conceding “the existence of the papers demanded and their
    possession or control by” the subpoenaed party. 
    Id. at 410
    .
    ¶38 But on the facts of Fisher, the Court determined that the
    communicative aspects of the act of production required of the
    subpoenaed party were too insignificant to warrant Fifth
    Amendment protection. In reaching that conclusion, the Court
    noted that, while the party’s act of producing the documents
    would reveal the existence of the documents as well as the fact
    that copies of them were in the party’s custody, those pieces of
    information were “a foregone conclusion and . . . add[ed] little or
    nothing to the sum total of the [g]overnment’s information.” 
    Id. at 411
    . In Fisher, the government already knew exactly which
    documents it was seeking, and it already knew that the
    subpoenaed party possessed them. 
    Id.
     at 393–94. Thus, the
    party’s act of producing the documents would reveal nothing to
    the government that it did not already know, and therefore the
    Court held that the party’s “Fifth Amendment privilege [was]
    not violated because nothing [the party] has said or done is
    deemed to be sufficiently testimonial.” 
    Id. at 411
    .
    ¶39 After Fisher, the Supreme Court has mentioned the
    foregone conclusion exception only once more, in Hubbell, again
    20181015-CA                    20                
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    State v. Valdez
    in the context of assessing the testimoniality of an act of
    producing documents. See 
    530 U.S. at
    43–45. This time, the Court
    found the concept inapplicable, stating that “[w]hatever the
    scope of this ‘foregone conclusion’ rationale, the facts of this case
    plainly fall outside of it,” because the government had “not
    shown that it had any prior knowledge of either the existence or
    the whereabouts” of the documents it sought. 
    Id.
     at 44–45.
    ¶40 Since Hubbell, lower courts have taken various approaches
    in their application of the foregone conclusion exception. Some
    courts and commentators have been reluctant to expand the
    scope of the exception, given the Supreme Court’s own apparent
    view that the exception is limited. See, e.g., Garcia v. State, 
    302 So. 3d 1051
    , 1056–57 (Fla. Dist. Ct. App. 2020), review granted, No.
    SC20-1419, 
    2020 WL 7230441
     (Fla. Dec. 8, 2020); G.A.Q.L. v. State,
    
    257 So. 3d 1058
    , 1065–66 (Fla. Dist. Ct. App. 2018) (Kuntz, J.,
    concurring); State v. Andrews, 
    234 A.3d 1254
    , 1287–88 (N.J. 2020)
    (LaVecchia, J., dissenting), petition for cert. filed, No. 20-937 (Jan.
    7, 2021); Davis, 220 A.3d at 548–49; see also LaFave, 3 Criminal
    Procedure § 8.13(a) (stating that “requir[ing] the subpoenaed
    party to reveal a passcode that would allow [the government] to
    perform the decryption . . . would require a testimonial
    communication standing apart from the act of production, and
    therefore make unavailable the foregone conclusion doctrine”).
    These authorities emphasize the fact that, in both Fisher and
    Hubbell—the only times the Supreme Court has mentioned the
    foregone conclusion exception—the Court was analyzing the
    testimoniality of an act of production of documents, and not the
    testimoniality of a verbal statement. In Davis, for instance, the
    Pennsylvania Supreme Court described the “foregone
    conclusion gloss on a Fifth Amendment analysis” as “an
    extremely limited exception” to Fifth Amendment self-
    incrimination principles, and noted that the Supreme Court had
    “never applied or considered the foregone conclusion exception”
    outside the context of analyzing the testimoniality of the act of
    producing “business and financial records.” See 220 A.3d at 549;
    see also G.A.Q.L., 257 So. 3d at 1066 (Kuntz, J., concurring) (noting
    20181015-CA                      21                 
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    State v. Valdez
    that “[t]he foregone conclusion exception has not been applied to
    oral testimony,” and viewing the exception as “inapplicable to
    the compelled oral testimony sought in this case”); Andrews, 234
    A.3d at 1287–88 (LaVecchia, J., dissenting) (disagreeing with an
    approach that would “expansively apply” the foregone
    conclusion cases “to force disclosure of the contents of one’s
    mind,” and instead urging the court to “adhere to the [Supreme]
    Court’s bright line: [that] the contents of one’s mind are not
    available for use by the government in its effort to prosecute an
    individual”). According to these authorities, the foregone
    conclusion concept simply does not apply when assessing the
    testimoniality of a verbal communication, such as a statement
    conveying a cell phone passcode to the government.
    ¶41 Other courts and commentators have taken a different
    approach, and have proceeded to analyze, on the merits, the
    applicability of the foregone conclusion exception to situations in
    which a suspect is forced to disclose the passcode to a cell phone.
    See, e.g., Andrews, 234 A.3d at 1273 (referring to a statement
    communicating a passcode as “a testimonial act of production,”
    and proceeding to analyze, on the merits, whether the foregone
    conclusion exception applied to the facts of the case); Davis, 220
    A.3d at 553–57 (Baer, J., dissenting) (referring to “the compulsion
    of [the suspect’s] password” as “an act of production,” and
    urging the court to conclude that “the foregone conclusion
    exception may potentially apply to cases involving the
    compelled disclosure of a computer password”). These
    authorities appear to recognize that the foregone conclusion
    exception has been applied by the Supreme Court only in the
    context of analyzing the testimoniality of acts of production of
    documents, but they nevertheless conclude that the act of
    communicating one’s passcode to the government falls into the
    category of an “act of production.”
    ¶42 We find the more limited approach to be more consistent
    with governing, binding case law. No Utah appellate court has
    considered the reach of the foregone conclusion exception. And
    20181015-CA                    22                
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    State v. Valdez
    because the exception is a Fifth Amendment construct, the cases
    from the United States Supreme Court—the last word as to the
    meaning and scope of the federal constitution—are binding.
    That Court, as noted, has not mentioned the foregone conclusion
    exception in over two decades, when the Court referred to it
    simply as “this ‘foregone conclusion’ rationale,” and noted that
    “whatever [its] scope . . . , the facts of this case plainly fall
    outside of it.” See Hubbell, 
    530 U.S. at 44
    . The Court has never
    applied the exception outside of the context of assessing the
    testimoniality of a nonverbal act of producing documents. See id.;
    see also Fisher, 
    425 U.S. at
    411–12. Yet the Court’s instruction
    regarding the testimoniality of verbal statements, as well as the
    strongbox key/safe combination illustration, appear to be as
    robust as ever. See, e.g., Davis, 220 A.3d at 547–49 (describing the
    strongbox key example from Doe, and concluding that
    “prohibition of application of the foregone conclusion rationale
    to areas of compulsion of one’s mental processes” as opposed to
    acts of production “would be entirely consistent with the
    Supreme Court decisions, surveyed above, which uniformly
    protect information arrived at as a result of using one’s mind”).
    ¶43 Moreover, given the vintage of the foregone conclusion
    cases, and the fact that the Supreme Court issued Fisher decades
    before cell phones were in widespread use, we have our doubts
    about whether the Supreme Court would extend the foregone
    conclusion concept to verbal statements that convey to the
    government the passcode to a modern cell phone. Such devices
    “could just as easily be called cameras, video players, rolodexes,
    calendars, tape recorders, libraries, diaries, albums, televisions,
    maps, or newspapers.” Riley v. California, 
    573 U.S. 373
    , 393
    (2014); see also United States v. Djibo, 
    151 F. Supp. 3d 297
    , 310
    (E.D.N.Y. 2015) (noting that a modern smartphone can contain,
    in digital form, the “combined footprint of what has been
    occurring socially, economically, personally, psychologically,
    spiritually, and sometimes even sexually, in the owner’s life”).
    And in a pair of recent cases, the Supreme Court has expressed
    hesitancy in applying analog-era legal rules to our fast-paced
    20181015-CA                     23                
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    State v. Valdez
    cell-phone-centric digital world. See, e.g., Carpenter v. United
    States, 
    138 S. Ct. 2206
    , 2222 (2018) (noting that when “confronting
    new concerns wrought by digital technology,” the Court “has
    been careful not to uncritically extend existing precedents,” and
    in that case refusing to extend the “third-party doctrine” to “cell-
    site location information”); Riley, 573 U.S. at 401–02 (refusing to
    extend the search-incident-to-arrest exception to the warrant
    requirement to cell phones found on arrestees); see also Eunjoo
    Seo v. State, 
    148 N.E.3d 952
    , 961–62 (Ind. 2020) (determining that
    the foregone conclusion exception did not apply to the facts of
    the case, in part because of doubt about whether the Supreme
    Court, in light of Carpenter and Riley, would extend the exception
    to apply to modern cell phones).
    ¶44 Accordingly, we conclude that the foregone conclusion
    exception has no potential application here, where Valdez was
    asked to provide his swipe code to Second Detective, and was
    not merely asked to turn over an unlocked phone. 6 Valdez’s
    6. Even if we were to conclude that the foregone conclusion
    exception could apply to verbal statements, or that Valdez’s
    statement was an act of production to which the exception could
    conceivably apply, it would not necessarily follow that the facts
    of this case fit within the exception’s ambit. Courts and
    commentators are deeply split about which conclusions must be
    clear and foregone in order for the exception to apply. Some
    have concluded that the exception applies only if the
    government can show that it already knew, prior to requesting
    access to the cell phone, exactly which limited set of documents
    it was seeking and that those documents were to be found on the
    phone. See, e.g., In re Grand Jury Subpoena Duces Tecum Dated
    March 25, 2011, 
    670 F.3d 1335
    , 1346 (11th Cir. 2012) (concluding
    that the foregone conclusion exception did not apply where the
    government could not show that it knew “whether any files exist
    and are located on the hard drives”); People v. Spicer, 
    125 N.E.3d 1286
    , 1291 (Ill. App. Ct. 2019) (“We consider that the proper
    (continued…)
    20181015-CA                     24                
    2021 UT App 13
    State v. Valdez
    (…continued)
    focus is not on the passcode but on the information the passcode
    protects.”); Eunjoo Seo v. State, 
    148 N.E.3d 952
    , 957–58 (Ind. 2020)
    (holding that, “unless the State can show it already knows” not
    only that “the suspect knows the password” but also that “the
    files on the device exist” and that “the suspect possessed those
    files,” then “the communicative aspects of the production fall
    within the Fifth Amendment’s protection”); Laurent Sacharoff,
    What Am I Really Saying When I Open My Smartphone? A Response
    to Orin S. Kerr, 97 Tex. L. Rev. Online 63, 68 (2019) (arguing that
    “[e]ntering the password to open the device is analogous to the
    physical act of handing over the papers” and that, therefore, “the
    foregone conclusion doctrine should apply to the files on the
    device” if the government can “show it already knows they exist
    and the defendant possesses them”). Others have concluded
    that, in order to avail itself of the exception, the government
    need demonstrate only that it already knew that the suspect
    knows the password. See, e.g., State v. Andrews, 
    234 A.3d 1254
    ,
    1273 (N.J. 2020) (concluding that “the foregone conclusion test
    applies to the production of the passcodes themselves, rather
    than to the phones’ contents), petition for cert. filed, No. 20-937
    (Jan. 7, 2021); State v. Pittman, --- P.3d ----, 
    367 Or. 498
    , 526–27
    (2021) (concluding that “[t]he testimonial information that the
    act [of production] communicates . . . does not include
    information about the phone’s content,” and “what the state
    must demonstrate it already knows” is merely that “the
    defendant knows the phone’s passcode”); Orin S. Kerr, Compelled
    Decryption and the Privilege Against Self-Incrimination, 
    97 Tex. L. Rev. 767
    , 783 (2018) (opining that “when investigators present a
    suspect with a password prompt, and they obtain an order
    compelling the suspect to enter in the correct password, the
    suspect cannot have a valid Fifth Amendment privilege if the
    government independently can show that the suspect knows the
    password”). But because Valdez was asked to provide the actual
    swipe code and was not merely asked to provide an unlocked
    (continued…)
    20181015-CA                     25                
    2021 UT App 13
    State v. Valdez
    verbal response—whether oral or written—to Second Detective’s
    request would have been testimonial in nature, in that it would
    have conveyed to the government information contained in
    Valdez’s mind, namely, the pattern of his swipe code. And as
    already stated, it is not contested here that the statement may
    have been at least indirectly incriminating, and that the State
    implied at trial that Valdez had an obligation to provide the
    swipe code. Thus, all three prerequisites for Fifth Amendment
    protection are present here: compulsion, testimoniality, and self-
    incrimination.
    D.     The State’s Use of the Evidence
    ¶45 “The mere mention” of a defendant’s decision to remain
    silent, however, does not violate that defendant’s constitutional
    rights. State v. Saenz, 
    2016 UT App 69
    , ¶ 10, 
    370 P.3d 1278
    (quotation simplified). Instead, what the Fifth Amendment
    forbids is “either comment by the prosecution on the accused’s
    silence or instructions by the court that such silence is evidence
    of guilt.” Griffin v. California, 
    380 U.S. 609
    , 615 (1965). That is, in
    order for Valdez’s constitutional rights to have been violated in
    this instance, the State must have used Valdez’s silence to
    “undermine the exercise of those rights guaranteed” by the
    Constitution. See Saenz, 
    2016 UT App 69
    , ¶ 10 (quotation
    simplified). Indeed, as we have previously recognized, “the evil
    to be avoided in this context” is not the mere mention of a
    defendant’s invocation of the right to remain silent but, rather,
    “the implication that such silence is evidence of guilt.” 
    Id.
    (…continued)
    phone, and because we have determined that the exception
    cannot apply to verbal statements seeking the contents of one’s
    mind, we need not—and unlike some other courts, see
    Commonwealth v. Davis, 
    220 A.3d 534
    , 550 n.9 (Pa. 2019), cert.
    denied, 
    141 S. Ct. 237
     (2020), we elect not to—take a position on
    the further applicability of the exception to the facts of this case.
    20181015-CA                      26                 
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    State v. Valdez
    (quotation simplified). The trial court did not discuss this next
    analytical step; indeed, its decision to allow Second Detective to
    testify about Valdez’s refusal to provide the passcode appears to
    have been based on a belief that such refusal is not protected by
    the Fifth Amendment at all. If a statement (or refusal to make a
    statement) does not enjoy Fifth Amendment protection, the
    prosecution can use the statement or refusal to imply guilt
    without offending the Fifth Amendment, and in such cases the
    court need not in this context analyze the uses to which the
    prosecution puts such evidence. However, because we have
    determined that Valdez’s refusal to provide the passcode does
    enjoy Fifth Amendment protection, we must proceed to assess
    whether the State used that evidence to imply Valdez’s guilt.
    ¶46 Here, the State did more than merely mention Valdez’s
    refusal to provide the swipe code. One of Valdez’s main
    defenses was his claim—supported by Ex-Wife’s trial
    testimony—that his encounter with Ex-Girlfriend had been
    friendly rather than adversarial, and had been preceded by a
    sexually charged text message exchange discussing
    reconciliation. During its closing argument, the State attempted
    to rebut this defense by pointing out that no such text messages
    were in evidence, and by urging the jury to disbelieve Ex-Wife’s
    account of the text messages she claimed to have seen. In so
    doing, the State described the “efforts that were taken to get into
    [Valdez’s] phone to determine what, if any, communication
    happened between” him and Ex-Girlfriend, and noted that
    Valdez had been given an opportunity to allow officers to access
    his cell phone—on which such messages could presumably be
    found—and that he “chose to decline to” provide the passcode. 7
    7. At oral argument, the State asserted that, even if it was not
    permitted to comment on Valdez’s silence, it was permitted to
    emphasize Valdez’s additional statement that officers should
    “destroy the phone.” On the record before us, we disagree. As an
    (continued…)
    20181015-CA                    27                
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    State v. Valdez
    ¶47 In its closing narrative, the State quite clearly invited the
    jury to draw an inference of guilt from Valdez’s silence. And
    even “[i]ndirect references to a defendant’s failure to testify are
    constitutionally impermissible if the comments were manifestly
    intended to be or were of such a character that the jury would
    naturally and necessarily construe them to be a comment on the
    defendant’s failure to testify.” State v. Tillman, 
    750 P.2d 546
    , 554
    (Utah 1987). In this vein, the Utah Supreme Court has declared
    that “a prosecutor commits constitutional error” by making a
    statement that is “of such character that a jury would naturally
    and necessarily construe it to amount to a comment on the
    failure of the accused” to speak. State v. Nelson-Waggoner, 
    2004 UT 29
    , ¶ 31, 
    94 P.3d 186
     (quotation simplified).
    ¶48 In sum, Valdez had a Fifth Amendment right to refuse to
    provide the swipe code to investigating officers, and during trial
    the State invited the jury to draw an inference of guilt from
    Valdez’s silence. This action was no “mere mention” of Valdez’s
    decision to withhold the swipe code. See Saenz, 
    2016 UT App 69
    ,
    ¶ 10 (quotation simplified). In this context, the State’s
    evidentiary use of Valdez’s refusal to provide the swipe code
    violated Valdez’s rights under the Fifth Amendment, and the
    trial court erred by allowing such evidence to come in and by
    allowing the State to use it in this manner.
    (…continued)
    initial matter, Valdez’s statement about destroying the phone
    was made in connection with stating his refusal to provide the
    passcode, and therefore commentary about Valdez’s statement
    about destroying the phone would have necessarily implicated
    Valdez’s exercise of his right to silence. And in any event, the
    State in closing argument did not emphasize Valdez’s statement
    about destroying the phone; instead, it emphasized Valdez’s
    choice to decline to provide officers the passcode.
    20181015-CA                     28                
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    State v. Valdez
    E.     Harmless Error
    ¶49 But not “all federal constitutional errors, regardless of
    their nature or the circumstances of the case, require reversal of a
    judgment of conviction.” Delaware v. Van Arsdall, 
    475 U.S. 673
    ,
    681 (1986). And “in the context of a particular case, certain
    constitutional errors, no less than other errors, may have been
    ‘harmless.’” 
    Id.
     However, when the error in question is
    “constitutional in nature, . . . its harmlessness is to be judged by
    a higher standard.” See State v. Villarreal, 
    889 P.2d 419
    , 425 (Utah
    1995) (quotation simplified). Under that higher standard,
    “reversal is required unless the error is harmless beyond a
    reasonable doubt,” State v. Drommond, 
    2020 UT 50
    , ¶ 105, 
    469 P.3d 1056
     (quotation simplified), and—at least for preserved
    claims of constitutional error—“the burden to demonstrate harm
    [or lack thereof] . . . shifts from the defendant to the State when a
    constitutional error is alleged,” see State v. Bond, 
    2015 UT 88
    ,
    ¶ 37, 
    361 P.3d 104
    ; see also Chapman v. California, 
    386 U.S. 18
    , 24
    (1967) (stating that “constitutional error . . . casts on someone
    other than the person prejudiced by it a burden to show that it
    was harmless”).
    ¶50 Under this harmless error standard, we must attempt to
    “determine the probable impact of the testimony on the minds of
    the average juror.” Drommond, 
    2020 UT 50
    , ¶ 105 (quotation
    simplified). In undertaking this inquiry, we “evaluate several
    factors,” including “the importance of the witness’s testimony in
    the prosecution’s case, whether the testimony was cumulative,
    the presence or absence of evidence collaborating or
    contradicting the testimony of the witness on material points, the
    extent of cross-examination permitted, and, of course, the overall
    strength of the prosecution’s case.” 
    Id.
     (quotation simplified). If
    we “may confidently say, on the whole record, that the
    constitutional error was harmless beyond a reasonable doubt,”
    then the conviction will be affirmed despite the error. See State v.
    Maestas, 
    2012 UT 46
    , ¶ 56, 
    299 P.3d 892
     (quotation simplified).
    On the other hand, “we cannot declare federal constitutional
    20181015-CA                     29                 
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    State v. Valdez
    error harmless unless we sincerely believe that it was harmless
    beyond a reasonable doubt.” See State v. Genovesi, 
    909 P.2d 916
    ,
    922 (Utah Ct. App. 1995) (quotation simplified); see also
    Drommond, 
    2020 UT 50
    , ¶ 105 (stating that “reversal is required
    unless the error is harmless beyond a reasonable doubt”
    (quotation simplified)).
    ¶51 Under the circumstances presented here, the State has not
    carried its burden of demonstrating that its improper use of
    evidence that Valdez refused to provide his swipe code was
    harmless beyond a reasonable doubt. Valdez’s chief defense to
    the charges was that the entire encounter with Ex-Girlfriend had
    not been a kidnapping or an assault, but instead had been
    voluntary on her part, and even a mutual effort toward
    reconciliation. And Ex-Wife’s testimony describing sexually
    charged text messages between Ex-Girlfriend and Valdez on the
    morning of the incident was an important part of Valdez’s
    defense. Indeed, the State recognized the importance of Ex-
    Wife’s testimony by discussing it—and attempting to rebut it—
    during closing argument by arguing that Valdez’s refusal to
    provide the swipe code indicated that no such text messages
    existed. See State v. Ellis, 
    2018 UT 2
    , ¶ 43, 
    417 P.3d 86
     (stating that
    one factor leading to the conclusion that the admission of the
    evidence was not harmless was that “[t]he prosecution
    emphasized [it] during closing argument”).
    ¶52 And while the prosecution’s case was certainly supported
    by some persuasive evidence, we do not consider its case to have
    been so overwhelming as to render the error harmless beyond a
    reasonable doubt. Ex-Girlfriend’s testimony was corroborated, in
    part, by Witness’s account, especially Witness’s perception that
    Valdez had been attempting to prevent Ex-Girlfriend from
    leaving the vehicle. But other portions of Ex-Girlfriend’s
    testimony were unsupported by other evidence. Indeed, the
    physical evidence pointed to a more minor altercation than the
    one Ex-Girlfriend reported. Ex-Girlfriend had a broken hair clip
    and a small cut on her lip, but no other signs of injury.
    20181015-CA                      30                 
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    State v. Valdez
    Additionally, officers never found Ex-Girlfriend’s phone, an
    actual handgun, or any knife, and Witness did not see a knife or
    a gun or any assault in her observations of the incident.
    ¶53 Given the total evidentiary picture presented here, we
    have reasonable doubt about whether the improperly admitted
    evidence made a difference in the outcome of this case.
    Accordingly, the State has not carried its burden of
    demonstrating that the error was harmless beyond a reasonable
    doubt. On this basis, we reverse Valdez’s conviction and remand
    for further proceedings, including potentially a new trial.
    II.
    ¶54 Valdez also raises a number of additional claims on
    appeal. First, he argues that his attorney rendered ineffective
    assistance of counsel in several respects, including the following:
    by failing to object to Second Detective’s testimony opining on
    the veracity of Ex-Girlfriend’s statements, and by failing to object
    to the length and detail of First Detective’s narrative of the
    incident. Second, Valdez asserts that the trial court erred when it
    excluded Aunt’s testimony. Because we reverse and remand for
    a new trial solely on the basis of the Fifth Amendment violation
    discussed above, we need not reach a decision on the merits of
    Valdez’s other arguments. But we are troubled by certain aspects
    of how the trial proceeded and, in an effort to offer guidance that
    might be useful on remand, where these issues are likely to arise
    again, we briefly discuss some of Valdez’s other arguments. See,
    e.g., State v. Low, 
    2008 UT 58
    , ¶ 61, 
    192 P.3d 867
     (although
    reversing on another ground and remanding for new trial,
    nevertheless proceeding to comment on “other issues presented
    on appeal that will likely arise during retrial”).
    ¶55 The testimony the State elicited from Second Detective
    regarding his opinion of the veracity of Ex-Girlfriend’s
    statements was improper and inadmissible “vouching”
    testimony, and the trial court was correct to step in, of its own
    20181015-CA                     31                
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    State v. Valdez
    accord, and strike that testimony. Our law “prohibits any
    testimony as to a witness’s truthfulness on a particular
    occasion.” See State v. Rimmasch, 
    775 P.2d 388
    , 391 (Utah 1989),
    superseded in part by rule as stated in State v. Maestas, 
    2012 UT 46
    ,
    ¶ 121 n.134, 
    299 P.3d 892
    . And in our view, these principles
    would have applied not only to Second Detective’s testimony
    that he believed Ex-Girlfriend was telling the truth, but also to
    his claims regarding his status as a sort of human lie detector,
    including his description of the techniques he employed in his
    efforts to ferret out lies. While we stop short of making any
    determination that Valdez’s counsel rendered ineffective
    assistance 8 in not objecting to Second Detective’s testimony in
    this regard, we note the impropriety of that testimony.
    ¶56 In addition, we are concerned about the State’s—and the
    trial court’s—conception of the scope of the so-called “police
    investigation exception” to the usual ban on hearsay testimony.
    In State v. Collier, 
    736 P.2d 231
     (Utah 1987), our supreme court
    held that a police officer was allowed to testify that a
    confidential informant had told him, prior to a raid on a house,
    that an occupant was “armed and would not be taken alive.” Id.
    at 233 (quotation simplified). The court held that this brief
    testimony, though consisting of another declarant’s out-of-court
    statement that might otherwise be considered hearsay, was
    admissible because it “was not admitted to prove the truth of the
    information”—that the occupant of the house was in fact armed
    and refused to be taken alive—but “rather to explain the conduct
    of the police in setting up an armed stakeout of the [house].” Id.
    at 234. Other jurisdictions have likewise recognized that limited
    8. To establish ineffective assistance of counsel, Valdez would
    have to show that his attorney’s representation “fell below an
    objective standard of reasonableness” and that “there is a
    reasonable probability that, but for counsel’s unprofessional
    errors, the result of the proceeding would have been different.”
    Strickland v. Washington, 
    466 U.S. 668
    , 688, 694 (1984).
    20181015-CA                     32                 
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    State v. Valdez
    statements made by other declarants, and offered by testifying
    police officers, that serve to explain why police acted in a
    particular way may constitute admissible non-hearsay because
    the statements are not offered for the truth of the matter
    asserted. See, e.g., Jones v. Basinger, 
    635 F.3d 1030
    , 1044–45 (7th
    Cir. 2011) (stating that “an informant’s out-of-court statement to
    law enforcement is not hearsay if that statement is offered into
    evidence as an explanation of why the subsequent investigation
    proceeded as it did” (quotation simplified)). But courts and
    commentators have noted that this hearsay “exception” carries
    the potential for abuse. See, e.g., 
    id. at 1046
     (stating that
    “statements offered to show ‘background’ or ‘the course of the
    investigation’ can easily violate a core constitutional right, are
    easily misused, and are usually no more than minimally
    relevant,” and urging courts “asked to admit such statements for
    supposed non-hearsay purposes” to be “on the alert for such
    misuse”); United States v. Cass, 
    127 F.3d 1218
    , 1222–23 (10th Cir.
    1997) (noting that the McCormick on Evidence treatise has
    “criticized the ‘apparently widespread abuse’ of [the police
    investigation exception],” and stating that proper use of the
    exception “involve[s] the admission of, at most, only a few
    limited statements” and not “scores of out-of-court statements”).
    While we do not purport to here set forth the precise parameters
    of the police investigation exception in Utah, or to decide
    whether Valdez’s counsel performed deficiently under these
    circumstances by lodging a tardy objection to First Detective’s
    testimony, it is our view that the entirety of First Detective’s
    lengthy narrative testimony about what Ex-Girlfriend told him
    was not admissible under that exception.
    ¶57 Finally, we make brief mention of Valdez’s assertion that
    Aunt should have been allowed to testify. On appeal—but not
    before the trial court—Valdez argues, citing State v. Thompson,
    
    2014 UT App 14
    , ¶ 29, 
    318 P.3d 1221
     (stating that rule 608(b)
    does not bar “evidence used to directly rebut a witness’s
    testimony or other evidence”), that Aunt’s testimony should
    have been allowed as ordinary impeachment evidence,
    20181015-CA                    33                
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    State v. Valdez
    admissible to rebut Ex-Girlfriend’s claim that she had largely
    attempted to avoid Valdez following their breakup. However,
    Valdez failed to make that argument before the trial court,
    arguing only that Aunt’s testimony was admissible pursuant to
    rule 608(c). Both because this claim is unpreserved, and because
    we need not reach its merits in any event, we do not opine as to
    the ultimate admissibility of Aunt’s testimony. But the argument
    is one that should be addressed on remand, should Valdez
    renew it there.
    CONCLUSION
    ¶58 Valdez’s Fifth Amendment rights were violated when the
    trial court allowed Second Detective to testify about Valdez’s
    refusal to provide the State his cell phone passcode, and the State
    argued, in turn, that the jury should infer from Valdez’s refusal
    that no reconciliatory texts between Valdez and Ex-Girlfriend
    existed. Because the State impermissibly invited the jury to
    interpret Valdez’s silence as an inference of his guilt, and
    because this error was not harmless beyond a reasonable doubt,
    we reverse and remand for further proceedings in accordance
    with this opinion.
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