v. Ornelas-Licano — , 2020 COA 62 ( 2020 )


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  •      The summaries of the Colorado Court of Appeals published opinions
    constitute no part of the opinion of the division but have been prepared by
    the division for the convenience of the reader. The summaries may not be
    cited or relied upon as they are not the official language of the division.
    Any discrepancy between the language in the summary and in the opinion
    should be resolved in favor of the language in the opinion.
    SUMMARY
    April 9, 2020
    2020COA62
    No. 16CA0244, People v. Ornelas-Licano — Crimes — Criminal
    Attempt — Murder in the Second Degree — First Degree Assault
    — Extreme Indifference; Colorado Constitution — Equal
    Protection; Evidence — Testimony by Experts
    This is an appeal from a criminal conviction for second degree
    murder. On appeal, the defendant contends that his conviction
    violates equal protection guarantees because attempted second
    degree murder is indistinguishable from the lesser offense of
    attempted first degree assault – extreme indifference. He also
    argues that the trial court abused its discretion by admitting expert
    testimony of a police officer analyzing the shape of a bullet hole in a
    windshield to determine where the shot came from.
    A division of the court of appeals unanimously rejects
    defendant’s equal protection challenge, concluding that the conduct
    proscribed by the second degree murder statute and first degree
    assault – extreme indifference statute is distinguishable for equal
    protection purposes. The division, with one judge dissenting, also
    concludes that the trial court abused its discretion by admitting the
    officer’s expert testimony because his experience did not qualify him
    to opine on the relationship between the angle of impact and shape
    of the bullet hole, and there is nothing in the record beyond the
    officer’s own assertions to show that someone can determine from
    the shape of a bullet hole in a windshield where the bullet came
    from. Because the majority of the division concludes this error was
    not harmless, it reverses.
    COLORADO COURT OF APPEALS                                           2020COA62
    Court of Appeals No. 16CA0244
    Larimer County District Court No. 14CR1760
    Honorable Stephen J. Schapanksi, Judge
    The People of the State of Colorado,
    Plaintiff-Appellee,
    v.
    Jose Ornelas-Licano,
    Defendant-Appellant.
    JUDGMENT REVERSED AND CASE
    REMANDED WITH DIRECTIONS
    Division VI
    Opinion by JUDGE WELLING
    Martinez*, J., concurs
    Berger, J., concurs in part and dissents in part
    Announced April 9, 2020
    Philip J. Weiser, Attorney General, John T. Lee, Senior Assistant Attorney
    General, Denver, Colorado, for Plaintiff-Appellee
    Megan A. Ring, Colorado State Public Defender, James S. Hardy, Deputy State
    Public Defender, Denver, Colorado, for Defendant-Appellant
    *Sitting by assignment of the Chief Justice under provisions of Colo. Const. art.
    VI, § 5(3), and § 24-51-1105, C.R.S. 2019.
    ¶1    Defendant, Jose Ornelas-Licano, appeals his conviction for
    attempted second degree murder. He argues that his conviction
    violates equal protection guarantees because attempted second
    degree murder is indistinguishable from the lesser offense of
    attempted first degree assault – extreme indifference. He also
    argues that the trial court abused its discretion by admitting expert
    testimony of a police officer analyzing the shape of a bullet hole in a
    windshield to determine where the shot came from.
    ¶2    We first conclude that the conduct proscribed by the second
    degree murder statute and first degree assault – extreme
    indifference statute is distinguishable for equal protection purposes.
    We next conclude that the trial court abused its discretion by
    admitting the officer’s expert testimony because his experience did
    not qualify him to opine on the relationship between the angle of
    impact and shape of the bullet hole, and there is nothing in the
    record beyond the officer’s own assertions to show that someone
    can determine from the shape of a bullet hole in a windshield where
    the bullet came from. Because this error was not harmless, we
    reverse.
    1
    I.    Relevant Facts and Procedural History
    ¶3    For reasons not pertinent to this appeal, a warrant was issued
    for Ornelas-Licano’s arrest. An officer driving an unmarked vehicle
    located Ornelas-Licano in his pickup truck parked in a driveway.
    The officer called for backup because he had been told that
    Ornelas-Licano might be armed. More officers arrived in their
    vehicles, turned on their emergency lights, and pulled up near
    Ornelas-Licano’s truck.
    ¶4    The officers got out and, with their guns drawn, commanded
    Ornelas-Licano to put his hands up and shut off the truck.
    Ornelas-Licano initially complied with the officers’ commands, but
    ultimately put the truck in gear and fled the scene. A chase
    ensued.
    ¶5    During the chase, Ornelas-Licano approached a marked police
    vehicle at an intersection. As the vehicles drew closer, a shot went
    off inside Ornelas-Licano’s truck, resulting in a bullet hole in his
    truck’s windshield. No one was hit, and the chase continued.
    ¶6    Ornelas-Licano eventually ran into another car, abandoned his
    truck and his gun, and fled on foot. Police ultimately apprehended
    him without further incident.
    2
    ¶7    After his arrest, Ornelas-Licano claimed that he had fired the
    gun accidentally while operating the stick shift for the truck’s
    manual transmission. The prosecutor did not credit this account
    and charged him with attempted first degree murder of the officer in
    the vehicle at the intersection and the lesser included offenses of
    attempted second degree murder and attempted first degree
    assault – extreme indifference. He was also charged with eluding
    police, leaving the scene of an accident, and other crimes.
    ¶8    At trial, Ornelas-Licano argued that he was not guilty of
    attempted murder or attempted assault because he had fired the
    gun accidentally. In other words, because the gunshot was the
    result of an accidental discharge, he acted without the requisite
    intent to commit either attempted murder or attempted assault.
    Ornelas-Licano’s lawyer told the jury that he was not contesting the
    other charges.
    ¶9    The prosecutor argued that Ornelas-Licano had intentionally
    pointed the gun at the officer in the police vehicle and fired. A
    police officer, qualified as an expert, testified that, based on the
    shape of the bullet hole in the truck’s windshield, the shot had been
    3
    fired from shoulder height, rather than from below the dash, near
    the stick shift, as Ornelas-Licano had claimed.
    ¶ 10         To rebut this testimony, Ornelas-Licano called his own expert
    witness, who testified that there were too many variables in play to
    conclude, based on either the shape of the bullet hole in the
    windshield or the experiment the prosecution expert conducted,
    that the shot had come from shoulder height, rather than below the
    dash.
    ¶ 11         A jury convicted Ornelas-Licano of attempted second degree
    murder, eluding police, reckless driving, leaving the scene of an
    accident, possession of a defaced firearm, and prohibited use of a
    weapon, and the trial court sentenced him accordingly. Ornelas-
    Licano appeals only the conviction for attempted second degree
    murder.
    II.     Ornelas-Licano’s Equal Protection Claim Is Without Merit
    ¶ 12         Ornelas-Licano first contends that his conviction for attempted
    second degree murder violates equal protection guarantees because
    4
    it requires a harsher punishment than, but is indistinguishable
    from, first degree assault – extreme indifference.1 We disagree.
    A.   Standard of Review and Applicable Law
    ¶ 13   We review de novo the constitutionality of a statute. Dean v.
    People, 
    2016 CO 14
    , ¶ 8. A statute is presumed to be
    constitutional, and the challenging party bears a heavy burden to
    demonstrate its unconstitutionality.
    Id. ¶ 14
      “When two criminal statutes prescribe different penalties for
    identical conduct, a defendant is denied equal protection under the
    laws if he is convicted under the harsher statute.” People v. Griego,
    
    2018 CO 5
    , ¶ 35. “Similarly, when separate statutes prescribe
    different penalties for what ostensibly might be different acts but
    offer no intelligent standard for distinguishing between and among
    these acts, those statutes deny equal protection under the law.”
    Id. 1 The
    United States Supreme Court has rejected this argument
    under the United States Constitution. United States v. Batchelder,
    
    442 U.S. 114
    , 125 (1979). But the Colorado Supreme Court has
    held that this claim is cognizable under the equal protection
    guarantees of the Colorado Constitution. People v. Marcy, 
    628 P.2d 69
    (Colo. 1981). Although Colorado’s constitution does not include
    an equal protection clause, the Colorado Supreme Court has
    “construe[d] the due process clause of the Colorado Constitution to
    imply a similar guarantee.” Dean v. People, 
    2016 CO 14
    , ¶ 11.
    5
    Distinctions between the two offenses “must turn on ‘reasonably
    intelligible standards of criminal culpability,’ and any definition of a
    crime must be ‘sufficiently coherent and discrete that a person of
    average intelligence can reasonably distinguish it from conduct
    proscribed by other offenses.’”
    Id. at ¶
    36 (quoting People v. Marcy,
    
    628 P.2d 69
    , 80-81 (Colo. 1981)).
    ¶ 15   A person commits second degree murder if “the person
    knowingly causes the death of a person.” § 18-3-103(1), C.R.S.
    2019. To satisfy the “knowingly” requirement, the person must be
    aware that his or her conduct is “practically certain” to cause the
    death of another person. § 18-1-501(6), C.R.S. 2019.
    ¶ 16   A person commits first degree assault - extreme indifference if
    that person
    (1)   “[u]nder circumstances manifesting extreme indifference
    to the value of human life,”
    (2)   “knowingly engages in conduct which creates a grave risk
    of death to another person,” and
    (3)   “thereby causes serious bodily injury to any person.”
    § 18-3-202(1)(c), C.R.S. 2019.
    6
    ¶ 17        An attempt occurs when a person “acting with the kind of
    culpability otherwise required for commission of [the] offense . . .
    engages in conduct constituting a substantial step toward the
    commission of the offense.” § 18-2-101(1), C.R.S. 2019.
    B.     Attempted Second Degree Murder Is Distinguishable from
    Attempted First Degree Assault - Extreme Indifference
    ¶ 18        Looking to the plain language of the statutes, we conclude that
    they do not proscribe the same conduct.
    ¶ 19        Attempted second degree murder requires a substantial step
    toward causing death, while attempted first degree assault –
    extreme indifference requires only a substantial step toward
    causing serious bodily injury. § 18-2-101(1); § 18-3-103; § 18-3-
    202(1)(c).
    ¶ 20        People v. Castro, 
    657 P.2d 932
    , 940-41 (Colo. 1983), overruled
    on other grounds by West v. People, 
    2015 CO 5
    , ¶¶ 29, 64, 70,
    highlights the importance of this distinction. In that case, the
    supreme court considered whether the alleged overlap between the
    crimes of attempted first degree extreme indifference murder and
    first degree assault violated equal protection guarantees.
    Id. The court
    concluded the conduct proscribed by the statutes was
    7
    distinguishable, in part because attempted murder requires “a
    substantial step towards the causation of another’s death,” and first
    degree assault does not.
    Id. at 941.
    ¶ 21   The same distinction applies here when we compare attempted
    second degree murder and attempted first degree assault – extreme
    in-difference: only one requires a substantial step toward the
    causation of another’s death. Therefore, the statutes do not
    proscribe the same conduct, and the equal protection claim fails.
    ¶ 22   Even though this analysis is sufficient to reject Ornelas-
    Licano’s equal protection argument, we briefly address his
    contention that 
    Marcy, 628 P.2d at 78
    , requires a different result.
    ¶ 23   Attempted second degree murder requires conduct practically
    certain to result in death, while attempted first degree assault –
    extreme indifference requires conduct that creates a grave risk of
    death. §§ 18-3-103, -202(1)(c). Ornelas-Licano argues that, under
    
    Marcy, 628 P.2d at 78
    , these standards proscribe the same
    conduct. But Marcy is distinguishable. Moreover, Marcy was
    superseded by statute, Ch. 212, sec. 4, § 18-3-102, 1981 Colo.
    Sess. Laws 973, as recognized in People v. Jefferson, 
    748 P.2d 1223
    ,
    1223-24 (Colo. 1988).
    8
    ¶ 24   In 
    Marcy, 628 P.2d at 79-80
    , the court held that first degree
    murder – extreme indifference was indistinguishable from the lesser
    offense of second degree murder for equal protection purposes, in
    part because the conduct proscribed by the greater offense (conduct
    practically certain to cause death) necessarily included the conduct
    proscribed by the lesser offense (conduct creating a grave risk of
    death).2
    ¶ 25   In this case, we are faced with the converse. And we conclude
    that, while conduct practically certain to cause death necessarily
    includes conduct creating a grave risk of death, conduct creating a
    grave risk of death does not necessarily include conduct practically
    certain to cause death.
    ¶ 26   People v. Rubio, 
    222 P.3d 355
    (Colo. App. 2009), illustrates
    this distinction well, and we follow its reasoning here. In that case,
    the defendant “used an AK-47 assault rifle to shoot repeatedly at an
    empty car parked outside a Denver residence” following a dispute
    with a woman inside the residence.
    Id. at 358.
    His “wild shots blew
    2 Montoya v. People, 
    2017 CO 40
    , relied on this reasoning in People
    v. Marcy, 
    628 P.2d 69
    , 78 (Colo. 1981), to make a similar
    observation and is, therefore, distinguishable for the same reasons.
    9
    holes not only in the car but also in two nearby residences,”
    injuring two girls.
    Id. He was
    convicted of multiple counts of
    attempted extreme indifference murder.
    Id. ¶ 27
      On appeal, the division “reject[ed] defendant’s contention that
    the prosecution [had to] prove he knew his actions were ‘practically
    certain’ to cause death,” concluding that the prosecutor needed only
    to prove that the defendant “engaged in depraved conduct that in
    fact created a grave risk of death.”
    Id. at 359.
    So, while the Rubio
    defendant’s actions created a grave risk of harm, they were not
    practically certain to result in death. Conduct practically certain to
    result in death requires a greater likelihood of the negative
    outcome, and the identified negative outcome is more severe,
    justifying the greater punishment for that conduct.
    ¶ 28   For these reasons, we conclude that the conduct proscribed by
    the second degree murder statute is reasonably distinguishable
    from that proscribed by the first degree assault – extreme
    indifference statute. It, therefore, follows that Ornelas-Licano’s
    attempted second degree murder conviction does not violate equal
    protection guarantees.
    10
    III.    The Officer’s Testimony Interpreting the Shape of the Bullet
    Hole in the Windshield and Evidence of the Windshield
    Experiment Were Improperly Admitted
    ¶ 29          Ornelas-Licano next contends that the trial court abused its
    discretion by admitting (1) testimony from Inspector Daniel Gilliam,
    the prosecution’s expert, that, based on his experience and the
    windshield experiment he had conducted, the elliptical shape of the
    bullet hole was more consistent with a shot fired from shoulder
    height than with a shot fired at the stick shift level; and (2) evidence
    of the results of the windshield experiment. We agree.
    A.   Additional Factual Background
    ¶ 30          Approximately ten months before trial, Inspector Gilliam,
    along with the detective assigned to the case, inspected the bullet
    hole in the front windshield of Ornelas-Licano’s truck. Based on
    the elliptical shape of the hole, Inspector Gilliam hypothesized that
    the shot had been fired from a “normal” shooting position (i.e.,
    shoulder height) and not from near the stick shift (which would be
    consistent with an accidental discharge).
    ¶ 31          To test his hypothesis, Inspector Gilliam developed an
    experiment. He obtained two new windshields that were the same
    type as the one in Ornelas-Licano’s truck. He fired Ornelas-
    11
    Licano’s gun through one of the windshields at approximately the
    same angle as a shot fired from the level of the truck’s stick shift.
    He then fired the gun through the other windshield at
    approximately the same angle as a shoulder-height shot. From
    these two data points, he opined that the “basic shape” of the bullet
    hole from the shoulder-height test shot was the “same” as the shape
    of the bullet hole in Ornelas-Licano’s windshield.
    ¶ 32   The People endorsed Inspector Gilliam as an expert witness.
    The evening before he was scheduled to testify, Ornelas-Licano
    objected to his qualifications and requested a hearing pursuant to
    People v. Shreck, 
    22 P.3d 68
    (Colo. 2001). The following morning,
    before the jury was called to the courtroom to begin the day, the
    trial court conducted a Shreck hearing.
    ¶ 33   At the Shreck hearing, Inspector Gilliam testified about his
    training and experience, as well as the windshield test he had
    performed. There was no dispute that Inspector Gilliam was an
    abundantly qualified firearms expert. He testified that he
     has worked with firearms for thirty-six years;
     was a member of the SWAT team for six years, which
    included “heavy firearms training”;
    12
     is a firearm and toolmark examiner; and
     shoots guns on an almost daily basis.
    ¶ 34   Inspector Gilliam also testified that the experiment he
    performed — the windshield test — was based on “the science of
    terminal ballistics.” Terminal ballistics, according to Inspector
    Gilliam, is the study of “how th[e] bullet reacts [with] whatever
    target it strikes.” Inspector Gilliam’s training and experience in
    terminal ballistics focused on three specific areas. First, because
    he “investigate[s] crime scenes and do[es] autopsies,” he routinely
    sees “what a bullet does upon impact” with various barriers,
    including human tissue, glass, walls, and cinderblock. Second, as
    a sniper, he “studied . . . very closely” what bullets “reacted best”
    through various barriers, including glass. Third, also based on his
    experience as a sniper, he studied how the trajectory of a bullet
    fired through glass would change based on the type of glass and
    angle of impact.
    ¶ 35   None of this training or experience, however, focused on the
    relationship between the angle of a bullet’s impact and the shape of
    the resulting hole. Indeed, on cross-examination during the Shreck
    hearing, Inspector Gilliam testified as follows:
    13
    Q. . . . But you were not being trained on the
    appearance of bullet holes in glass based on
    different firing locations, correct?
    A. No. It was just an observation that every
    time we shot glass, we would look at the holes
    and so we knew which angles we had shot at
    and we could see the shape of the hole,
    whether it be glass, tempered glass, or
    laminated.
    Q. Okay. And so your observations of the
    bullet holes in laminated glass, that’s not really
    based on specialized training as much as it is
    anecdotal experience, true?
    A. True. And that was in the effect of what we
    were accomplishing.
    (Emphasis added.)
    ¶ 36   Near the close of the Shreck hearing, Inspector Gilliam said
    that the opinion he would offer at trial, based on his observations
    and the windshield experiment, would be that the gun “was
    probably held at a shoulder height and shot straight . . . towards
    the windshield.”
    ¶ 37   The nature of Ornelas-Licano’s objection to Inspector Gilliam’s
    testimony was not that he wasn’t a firearms expert. Indeed,
    everyone agreed he was. Instead, Ornelas-Licano’s objection was
    that Inspector Gilliam’s methodology wasn’t reliable and that he
    wasn’t qualified in the relevant field of terminal ballistics —
    14
    specifically, in determining the angle of impact of a bullet from the
    shape of a bullet hole.
    ¶ 38   The trial court disagreed, ruling that Inspector Gillam would
    be permitted to testify as an expert. With respect to reliability, the
    court determined, “The defense has argued that the scientific
    principles involved here are unreliable. I don’t agree. I mean,
    ballistics, as described by the witness, the three aspects of it, is not
    unreliable scientific evidence.”
    ¶ 39   And with respect to the witness’s qualifications, the court
    found:
    The Court finds he is qualified. There’s a lot of
    ways that an expert may be qualified. It does
    not necessarily require that you have a physics
    degree. It does not -- it is knowledge, skill,
    experience, training, or education. This
    witness has a lot of experience. He has some
    training that is, if not precisely on this issue,
    certainly related to this issue, 40 hours of
    training that included some firing through
    glass and so forth.
    (Emphasis added.)
    ¶ 40   Inspector Gilliam then testified as an expert in front of the
    jury. He testified about the windshield test, and photographs of the
    test bullet holes and the actual bullet hole were shown to the jury.
    15
    Inspector Gilliam ultimately opined that the shot that pierced the
    truck’s windshield came “[f]rom closer to the natural shooting
    position,” and not from near the stick shift.
    B.    Preservation and Legal Principles
    ¶ 41   The Attorney General concedes, and we agree, that Ornelas-
    Licano preserved his objection to Inspector Gilliam offering his
    expert opinion or testifying regarding the windshield experiment.
    ¶ 42   “The trial court has broad discretion to determine the
    admissibility of expert testimony.” Golob v. People, 
    180 P.3d 1006
    ,
    1011 (Colo. 2008). “We will not overturn its decision unless it is
    ‘manifestly erroneous.’”
    Id. (quoting People
    v. Ramirez, 
    155 P.3d 371
    , 380 (Colo. 2007)).
    ¶ 43   CRE 702 and CRE 403 govern the admissibility of all expert
    testimony in this jurisdiction. Kutzly v. People, 
    2019 CO 55
    , ¶ 10;
    Ruibal v. People, 
    2018 CO 93
    , ¶ 12. Under CRE 702, “[i]f scientific,
    technical, or other specialized knowledge will assist the trier of fact
    to understand the evidence or to determine a fact in issue, a
    witness qualified as an expert by knowledge, skill, experience,
    training, or education, may testify thereto in the form of an opinion
    or otherwise.” The expert testimony must be reliable and relevant,
    16
    and its probative value must not be substantially outweighed by
    any of the countervailing considerations listed in CRE 403. Kutzly,
    ¶ 10. “Determining if expert testimony is reasonably reliable
    requires considering the totality of the circumstances surrounding
    the proposed expert testimony and is not contingent on any specific
    list of factors.”
    Id. at ¶
    12 (“[C]ertain factors — such as whether the
    technique has been tested, whether it has been subjected to peer
    review and publication, whether it has been generally accepted, its
    known or potential rate of error, and the existence and maintenance
    of standards controlling its operation — will be crucial in some
    cases but inapposite in others.”). And “a trial court’s reliability
    determination should consider whether the witness is qualified as
    an expert regarding the proposed testimony.”
    Id. ¶ 44
      Though CRE 702 and Fed. R. Evid. 702 differ in some
    respects, case law interpreting both rules emphasizes that the
    principles and methodology underlying expert testimony must be
    reliable. E.g., Kumho Tire Co. v. Carmichael, 
    526 U.S. 137
    , 147-58
    17
    (1999);3 Ruibal, ¶¶ 12-16. Accordingly, analysis under Fed. R. Evid.
    702 informs our analysis here.
    In the typical case, the proponent invites the
    expert to describe a general technique or
    theory and then apply to the technique or
    theory to the specific facts of the case. In
    essence, the balance of the expert’s testimony
    is a syllogism: The major premise is the
    validity of the expert’s general theory or
    technique, the minor premise is the case
    specific data, and the application of major to
    minor yields a conclusion relevant to the
    merits of the case. . . .
    ....
    . . . [When an] expert is making an inferential
    claim, a foundation merely showing the
    expert’s experience is inadequate. The judge
    should insist on a foundation demonstrating
    that the expert’s technique . . . “works”; that
    is, it enables the expert to accurately make the
    determination as to which he or she proposes
    to testify. The foundation must include a
    showing of the results when the technique was
    used on prior occasions. Do the outcomes
    demonstrate a connection between facts A and
    B? Neither the expert’s personal voucher nor
    general acceptance in the field nor even long-
    term, repeated use of the theory suffices.
    3Kumho Tire Co. v. Carmichael, 
    526 U.S. 137
    (1999), served as one
    of the bases for the amendments to Fed. R. Evid. 702 that
    differentiate it from CRE 702. See Fed. R. Evid. 702 advisory
    committee’s note to 2000 amendments.
    18
    1 McCormick on Evidence § 13 (Kenneth S. Broun ed., 7th ed. 2013)
    (footnote omitted).
    C.    Analysis
    ¶ 45   The underlying premise of both Inspector Gilliam’s opinion
    testimony and the windshield test is that there is a nonrandom
    correlation between the shape of a bullet hole in a windshield and
    the angle of impact of the bullet. If there is no such correlation,
    meaning that it is a random occurrence that a particular shape of
    bullet hole is caused by a particular angle of impact, neither
    Inspector Gilliam’s testimony nor the windshield test has any
    probative value. Ornelas-Licano challenged both (1) the
    qualifications of Inspector Gilliam to render his opinion and (2) the
    reliability of the methodology he used to reach his opinion. We
    conclude that the trial court abused its discretion by permitting
    Inspector Gilliam to testify as an expert on the relationship between
    the shape of a bullet hole and where the shot came from, as well as
    the results of his windshield test.
    ¶ 46   Aside from Inspector Gilliam’s own hypothesis, the record is
    devoid of any showing that the shape of a bullet hole in a
    windshield is demonstrative or indicative of the angle at which the
    19
    bullet struck the glass. Inspector Gilliam purported to be able to
    apply a technique to determine, based on the shape of a bullet hole,
    where the bullet came from, but there was no showing that the
    technique “works.” See McCormick on Evidence § 13.
    ¶ 47   The prosecutor presented no evidence, either through
    Inspector Gilliam or otherwise, that anyone other than Inspector
    Gilliam himself had previously analyzed the relationship between
    the shape of a bullet hole in laminated glass and the angle of
    impact. No evidence was presented that the existence of such a
    relationship had been subject to peer review or was scientifically
    sound or generally accepted. Estate of Ford v. Eicher, 
    250 P.3d 262
    ,
    267 (Colo. 2011); 
    Ramirez, 155 P.3d at 378-79
    . Inspector Gilliam
    never testified that he or anyone else had conducted this type of
    analysis before, much less described the results from when this
    technique had been applied in the past.4
    4 When asked during the Shreck hearing whether he had “ever done
    a test like this before,” Inspector Gilliam responded, “If I have, I
    don’t recall.” At trial, he was asked “would it be fair to say that this
    is the first time that you have conducted a test in order to
    determine the angle of impact of a windshield -- angle of impact of a
    bullet going through a windshield?” To that question, he
    responded, “It is.”
    20
    ¶ 48      While Inspector Gilliam testified that he had extensive
    experience in shooting through various windshields, indeed had
    done so more than one hundred times, all of that experience was in
    the context of determining the effect the windshield had on the
    bullet and its trajectory after it passed through the glass, not to
    analyze the relationship between the angle of impact and the shape
    of the bullet hole.5
    5   At trial, Inspector Gilliam testified as follows:
    Q. . . . You talked about the training that you
    did with the SWAT group regarding shooting
    through glass. Do you recall that?
    A. I do.
    Q. And the primary focus of that training was
    teaching an individual how to shoot through
    glass and what happens to a bullet when it
    hits glass; is that fair to say?
    A. Correct.
    ....
    Q. . . . But no part of that training was devoted
    to studying bullet holes to determine an angle
    of impact?
    A. No.
    21
    ¶ 49   In response to the question, “In your training and experience,
    what does an elliptical hole indicate?” Inspector Gilliam testified
    that “in firearms or bloodstain, it indicates that it’s been deposited
    at an angle.” Similarly, in a report that wasn’t offered or presented
    to the jury, but was received and considered by the court during the
    Shreck hearing, Inspector Gilliam stated that “[f]rom previous
    experience and testing of shots through a windshield, an elliptical
    hole indicate[s] that the bullet has struck the windshield at an
    angle other than perpendicular.”
    ¶ 50   These statements are insufficient to establish reliability under
    CRE 702. Inspector Gilliam did not describe the methodology
    underlying the “testing of shots through a windshield,” the purpose
    of that testing, the analysis conducted, or the results of that testing
    beyond his conclusion that shots fired at an angle produce elliptical
    bullet holes. And the statements do nothing to establish that he or
    anyone else can reliably apply his theory to interpret the shape of
    the bullet hole in this case.
    22
    ¶ 51   The absence of that foundational testimony is fatal to the
    admission of this testimony.6 Nothing supported Inspector
    Gilliam’s opinion or the implicit reliability of the experiment other
    than his own “bare assertions.” 
    Ramirez, 155 P.3d at 379
    ; see also
    Fed. R. Evid. 702 advisory committee’s note to 2000 amendments
    (“The trial court’s gatekeeping function requires more than simply
    ‘taking the expert’s word for it.’”).
    ¶ 52   Colorado case law further supports this conclusion. In Brooks
    v. People, 
    975 P.2d 1105
    (Colo. 1999), the court considered
    whether, under CRE 702 and CRE 403, to admit testimony from a
    police dog handler that the dog had identified the defendant as the
    person who had left the tracks from the scene of the crime. Before
    this testimony could be admitted, the court required a showing that
    the dog was “of a breed characterized by acute power of scent,” the
    dog had been “trained to follow a track by scent,” the dog had been
    6 We do not address whether this type of expert testimony or the
    windshield test may be admissible under CRE 702 and CRE 403
    with greater record support. If it is potentially admissible, we do
    not address what specific showing must be made to support its
    admission. The trial court has wide discretion to make such
    determinations regarding the admission of expert testimony. Golob
    v. People, 
    180 P.3d 1006
    , 1011 (Colo. 2008).
    23
    “found by experience to be reliable in pursuing human tracks,” the
    dog had been “placed on the trail where the [defendant] was known
    to have been,” and the “tracking efforts took place within a
    reasonable time, given the abilities of the animal.”
    Id. at 1114.
    ¶ 53   In short, the court required an extensive foundation to support
    the prosecutor’s claim that the dog was capable of identifying a
    perpetrator by scent and that the dog had reliably done so in this
    case. Here, we have no showing, beyond Inspector Gilliam’s own
    self-vouching, that someone can analyze the shape of a bullet hole
    to determine where the shot came from or that he reliably applied
    that technique in this case.
    ¶ 54   Similarly, the Colorado Supreme Court has excluded, under
    CRE 702 and CRE 403, expert testimony of a detective describing
    the profile of a drug courier and concluding that the defendant was
    a drug courier. Salcedo v. People, 
    999 P.2d 833
    (Colo. 2000). The
    court concluded that this testimony was inadmissible because of
    the “lack of evidence indicating that [the detective] utilized an
    objective, widely recognized profile” and the “lack of evidence . . .
    indicating that conformity to [the detective’s] drug courier profile is
    a reliable indicator of guilt.”
    Id. at 839.
    In this case, there is no
    24
    showing that the expert’s method is “widely recognized” or
    “objective” or that it can reliably determine the angle of impact.
    ¶ 55    And more recently, in Ruibal, 
    2018 CO 93
    , the Colorado
    Supreme Court excluded expert testimony based on the theory of
    “overkill” that the assailant in that case had an emotional
    connection with the victim. The court stated that “the record was
    virtually devoid of support[] concerning the reliability of the
    scientific principles underlying the theory and interpretation of
    ‘overkill.’”
    Id. at ¶
    15.
    The witness relied on a single treatise as
    support for the theory of “overkill,” which even
    he did not accept as generally authoritative,
    and which, in any event, defined “overkill” far
    too narrowly . . . to support the essential
    inference, drawn by the expert in this case, of
    an emotional relationship between the victim
    and killer. Similarly, although the witness
    testified that he had performed many
    autopsies himself and knew “who confessed to
    doing what,” he failed to offer even anecdotal,
    much less empirical, evidence supporting his
    conclusion that beatings like the one in this
    case were likely committed by someone with
    an emotional connection to the victim. Finally,
    neither the appellate courts of this jurisdiction
    nor those of any other jurisdiction have yet
    accepted as reliable the theory or
    interpretation of “overkill” advanced by the
    witness.
    25
    Id. (footnote omitted).
    ¶ 56   In sum, the Colorado Supreme Court has consistently required
    more than the expert’s own assertions to support the required
    finding that the expert’s underlying theory is reliable. That showing
    was not made in this case.7 Cf. United States v. Frazier, 
    387 F.3d 1244
    , 1265 (11th Cir. 2004) (concluding that because the putative
    expert “was relying solely or primarily on his experience, it
    remained the burden of the proponent of this testimony to explain
    how that experience led to the conclusion he reached, why that
    experience was a sufficient basis for the opinion, and just how that
    experience was reliably applied to the facts of the case”).
    7 Though not relied on by either party, we note that People v.
    Caldwell, 
    43 P.3d 663
    , 667 (Colo. App. 2001), does not support a
    different result. In that case, the division observed that “[n]o
    special expertise is required to look at the hole made by the bullet
    and realize that it followed a straight-line path.”
    Id. In Caldwell,
    a
    former police officer used string to track the paths of bullets
    through a car and testified about their trajectories on that basis.
    Id. There, the
    evidence established multiple points along the
    bullets’ paths, which the witness used to establish their trajectories.
    Here, the evidence established only one point in the bullet’s path —
    the hole in the windshield. The testimony in Caldwell was based on
    the bullets’ paths, not the shape of the bullet holes. Accordingly,
    Caldwell does not inform our analysis.
    26
    ¶ 57   The Sixth Circuit has developed a useful framework for
    evaluating the reliability of an expert’s opinion, explaining that
    there are a number of “[r]ed flags that caution against certifying an
    expert.” Newell Rubbermaid, Inc. v. Raymond Corp., 
    676 F.3d 521
    ,
    527 (6th Cir. 2012). These red flags include (1) “reliance on
    anecdotal evidence”; (2) “improper extrapolation”; (3) “failure to
    consider other possible causes”; (4) “lack of testing”;
    (5) “subjectivity”; and (6) that “a purported expert’s opinion was
    prepared solely for litigation.”
    Id. (first citing
    Best v. Lowe’s Home
    Ctrs., Inc., 
    563 F.3d 171
    , 177 (6th Cir. 2009); then citing Johnson v.
    Manitowoc Boom Trucks, Inc., 
    484 F.3d 426
    , 434 (6th Cir. 2007)).
    ¶ 58   Each of these red flags, to one degree or another, is present
    here. For example, Inspector Gilliam’s hypothesis regarding the
    relationship between the angle of impact and the shape of the bullet
    hole is based on anecdotal observations incidental to his training
    and experience as a sniper. Further, his conclusion is subjective
    (i.e., the “similarity” of the shapes of various bullet holes) and is
    extrapolated from two data points, which were recorded during a
    test developed specifically for this litigation. The prevalence of these
    red flags further supports our conclusion that it was an abuse of
    27
    discretion for the trial court to permit Inspector Gilliam to testify as
    an expert in the relationship between the shape of a bullet hole and
    the angle of the bullet’s impact.
    ¶ 59   Finally, even if the prosecutor had introduced only the results
    of the windshield experiment through lay testimony, without any
    lay or expert opinions, those results would still be inadmissible. Cf.
    People v. Wilkerson, 
    114 P.3d 874
    , 876-77 (Colo. 2005) (“Even
    though a general area of scientific knowledge is determined to be
    reliable, if the results of a scientific test or comparison are not self-
    evident, the test itself lacks relevance unless there is also reliable
    expert interpretation of its results.”). Under CRE 403, if the
    probative value of any evidence is substantially outweighed by the
    dangers of unfair prejudice and misleading the jury, the evidence
    must be excluded. This evidence, on this record, is unfairly
    prejudicial and misleading because it supports the prosecutor’s
    theory of the case, even though there is nothing in the record to
    show that anything but randomness accounted for any similarity
    between the actual bullet hole and the hole created by the shoulder-
    height test shot.
    28
    IV.   The Error Was Not Harmless
    ¶ 60   Unless it implicates the defendant’s constitutional rights, an
    error in the admission of expert testimony requires reversal only
    when it “substantially influence[d] the verdict” or “affect[ed] the
    fairness of the trial proceedings.” Ruibal, ¶ 17.
    ¶ 61   Ornelas-Licano urges that the error implicated his
    constitutional rights and, therefore, we must apply the
    constitutional harmless error standard. We do not reach the
    question of whether the constitutional harmless error standard
    applies because we conclude that the error is reversible under the
    more stringent nonconstitutional harmless error standard.
    ¶ 62   Attempted second degree murder is a serious crime, and
    Ornelas-Licano faced a lengthy prison sentence if convicted. To
    obtain a conviction, the prosecutor had to prove beyond a
    reasonable doubt that Ornelas-Licano knowingly engaged in
    conduct that was a substantial step toward causing the death of the
    officer in the vehicle at the intersection. To make this case, the
    prosecutor introduced two main types of evidence. First, the
    prosecutor elicited expert testimony and introduced exhibits related
    to the windshield experiment to show that Ornelas-Licano fired the
    29
    gun from a “natural shooting position.” Second, the prosecutor
    elicited testimony from a jailhouse witness who claimed that, before
    the incident, Ornelas-Licano had told him that he intended to have
    a “shootout” with police rather than be taken into custody.
    ¶ 63   Disregarding the testimony of Inspector Gilliam regarding the
    shape of the bullet hole and evidence of the windshield test, the
    strongest support for the prosecutor’s theory that Ornelas-Licano
    pointed the gun at the officer’s vehicle and fired was the testimony
    of the jailhouse witness. But direct and cross-examination of the
    jailhouse witness undermined his credibility in several ways. At the
    time of trial, the jailhouse witness was in custody and subject to
    deportation proceedings. He testified that he had been paid as a
    police informant eleven times before this case, he was facing a
    charge for false reporting to police, and his deportation hearing
    would be held the day after his testimony in this case.
    ¶ 64   Moreover, “[t]here are special concerns attendant to law
    enforcement expert testimony.” United States v. Rodriguez, 125 F.
    Supp. 3d 1216, 1238 (D.N.M. 2015) (citing United States v. Medina–
    Copete, 
    757 F.3d 1092
    (10th Cir. 2014)). For example, “there is
    something qualitatively different about law enforcement expertise
    30
    from other forms of expertise” because “[l]aw enforcement
    officers . . . are experts in whodunit, and there is a danger that a
    jury will perceive their area of expertise as solving crimes and
    determining guilt or innocence.”
    Id. at 1252;
    see also 
    Frazier, 387 F.3d at 1263
    (“[E]xpert testimony may be assigned talismanic
    significance in the eyes of lay jurors, and, therefore, the district
    courts must take care to weigh the value of such evidence against
    its potential to mislead or confuse.”).
    ¶ 65   In short, given that there was nothing showing that Inspector
    Gilliam’s testimony or the windshield experiment was reliable, the
    importance of the testimony to a central disputed issue, and the
    weakness of the other evidence supporting the prosecutor’s theory
    of the case, the admission of Inspector Gilliam’s expert testimony
    and the windshield evidence substantially affected the verdict and
    undermined the fairness of the trial. Accordingly, reversal is
    required.
    ¶ 66   Because we reverse on these grounds, we do not address
    Ornelas-Licano’s other arguments related to Inspector Gilliam’s
    testimony and windshield experiment evidence.
    31
    V.   Conclusion
    ¶ 67   Ornelas-Licano’s conviction for attempted second degree
    murder is reversed, and the case is remanded for a new trial on that
    charge. Because the issue has not been briefed, we do not address
    the question of whether either party may seek a lesser included
    offense instruction as to the charge of attempted first degree assault
    – extreme indifference. We do not disturb Ornelas-Licano's other
    convictions.
    JUSTICE MARTINEZ concurs.
    JUDGER BERGER concurs in part and dissents in part.
    32
    JUDGE BERGER, concurring in part and dissenting in part.
    ¶ 68    I agree with the majority’s rejection of Jose Ornelas-Licano’s
    equal protection claim. Although a close question, I cannot agree
    with the majority’s analysis and reversal based on the admission of
    expert testimony. Therefore, I respectfully dissent.
    I.   Admission of Expert Testimony Interpreting the Shape of the
    Bullet Hole in the Windshield and Evidence of the Windshield
    Experiment Was Not an Abuse of Discretion
    ¶ 69    Ornelas-Licano contends that the trial court abused its
    discretion by admitting testimony from the prosecution expert that,
    based on his experience and the windshield experiment, the
    elliptical shape of the bullet hole in the truck’s windshield was more
    consistent with a shot fired from shoulder height than with a shot
    fired from the level of the stick shift.
    ¶ 70    Ornelas-Licano lodges multiple separate, but related,
    challenges. First, he claims that the expert was not qualified.
    Second, he claims that the opinions were not reliable under CRE
    702. Third, he claims that the evidence was “misleading” and not
    helpful to the jury because there were an infinite number of
    possible shooting positions. Finally, he claims that the trial court’s
    findings were insufficient under CRE 702. I reject each of these
    33
    contentions in turn and conclude that the trial court did not abuse
    its discretion by admitting this expert testimony.
    A.    The Expert’s Qualifications and the Reliability of His Opinions
    ¶ 71   “The trial court has broad discretion to determine the
    admissibility of expert testimony.” Golob v. People, 
    180 P.3d 1006
    ,
    1011 (Colo. 2008). “We will not overturn its decision unless it is
    ‘manifestly erroneous.’”
    Id. (quoting People
    v. Ramirez, 
    155 P.3d 371
    , 380 (Colo. 2007)). “This deference reflects the superior
    opportunity of the trial judge to gauge the competence of the expert
    and the extent to which his opinion would be helpful to the jury.”
    Id. (quoting Ramirez,
    155 P.3d at 380).
    ¶ 72   “If scientific, technical, or other specialized knowledge will
    assist the trier of fact to understand the evidence or to determine a
    fact in issue, a witness qualified as an expert by knowledge, skill,
    experience, training, or education, may testify thereto in the form of
    an opinion or otherwise.” CRE 702. To determine whether expert
    testimony is admissible under CRE 702, the court must make
    determinations as to (1) the “reliability of the scientific principles”;
    (2) the “qualifications of the witness”; and (3) the “usefulness of the
    testimony to the jury.” People v. Shreck, 
    22 P.3d 68
    , 70 (Colo.
    34
    2001). “The ‘crucial question’ trial courts must answer when
    determining the admissibility of proffered expert testimony is: ‘On
    this subject can a jury from this person receive appreciable help?’”
    People v. Williams, 
    790 P.2d 796
    , 798 (Colo. 1990) (quoting 3 Jack
    B. Weinstein and Margaret A. Berger, Weinstein’s Evidence
    § 702[01], at 702-7 to 702-8 (1988)).
    ¶ 73   Ornelas-Licano first contends that the expert was not qualified
    to testify, based on the shape of the bullet hole, what angle the shot
    came from. He further contends that any such testimony was
    unreliable. Because these contentions are related, I address them
    together.
    ¶ 74   Ornelas-Licano correctly points out that the expert had no
    training or education in analyzing bullet holes to determine a
    bullet’s flight path or reconstructing shooting scenes generally. In
    addition, he correctly states that the expert presented no scientific
    literature or other evidence supporting the reliability of his bullet
    hole analysis.
    ¶ 75   CRE 702, however, allows an expert to testify based on his or
    her experience. The inquiry under CRE 702 “should be broad in
    nature and consider the totality of the circumstances of each
    35
    specific case.” 
    Shreck, 22 P.3d at 70
    . There is no exclusive list of
    factors that a court must consider.
    Id. ¶ 76
      As foundation for his opinions, the expert testified that he had
    extensive experience in shooting through vehicle windshields in
    connection with his training as a police sniper. I recognize that the
    primary purpose of those shootings was to determine the effect of
    an intervening windshield on a bullet’s trajectory after it passed
    through the glass. But the expert also testified that he had
    repeatedly observed a relationship between the angle of impact of a
    bullet on the windshield and the shape of the hole made by the
    bullet.
    ¶ 77   In response to the question, “In your training and experience,
    what does an elliptical hole indicate?” the officer testified that “in
    firearms or bloodstain, it indicates that it’s been deposited at an
    angle.” Similarly, in a report that was not offered or presented to
    the jury, but was received and considered by the court during the
    Shreck hearing, the officer stated that “[f]rom previous experience
    and testing of shots through a windshield, an elliptical hole
    indicate[s] that the bullet has struck the windshield at an angle
    other than perpendicular.”
    36
    ¶ 78   On these facts, I believe that the trial court acted within its
    discretion in concluding that the officer was qualified to testify
    regarding his conclusions based on the shape of the bullet hole in
    the windshield. A person who has shot through a hundred
    windshields and has observed the relationship between the angle of
    impact and the shape of the bullet holes meets the qualifications
    requirements of CRE 702.
    ¶ 79   The closer and more difficult question is whether the
    foundational testimony was sufficient to meet the reliability
    requirement of CRE 702. I emphasize that the question before us is
    not whether we appellate judges would have admitted the
    testimony, had we acted as the trial judge. People v. Rhea, 
    2014 COA 60
    , ¶ 58. Instead, the question is whether the trial court
    abused its discretion by admitting the expert testimony on this
    evidentiary record.
    Id. ¶ 80
      I conclude, after applying this deferential abuse of discretion
    standard, that the trial court did not abuse its discretion in finding
    that the expert testimony was sufficiently reliable under CRE 702.
    Contrary to the majority’s analysis, cases where the Colorado
    37
    Supreme Court has held experience-based expert testimony
    inadmissible do not dictate a different result.
    ¶ 81   In Ruibal v. People, the supreme court held that it was error
    for the trial court to admit expert testimony from a forensic
    pathologist because (1) the trial court did not make any findings
    concerning the reliability of the principles underlying the expert’s
    theory and (2) the record was devoid of support as to the theory’s
    reliability. 
    2018 CO 93
    , ¶ 15. The expert in that case had
    experience in conducting autopsies and had on many occasions
    learned, at trial, about an assailant’s relationship to his or her
    victim.
    Id. He testified
    that the victim’s injuries in Ruibal
    demonstrated “overkill,” a term describing multiple injuries on one
    area of the body, which indicates that the assailant had an
    emotional attachment to the victim.
    Id. at ¶
    9.
    ¶ 82   Both justifications for excluding the expert opinion in Ruibal
    are absent from this case. The trial court found that the expert’s
    theory was sufficiently reliable. In an oral ruling, the court stated,
    “The defense has argued that the scientific principles involved here
    are unreliable. I don’t agree.” The record supported this finding.
    The expert testified that he had shot through over one hundred
    38
    windshields, and that his experiences identified a relationship
    between the angle of impact of a bullet on the windshield and the
    shape of the hole left by the bullet.
    ¶ 83   The results of the expert’s experiment buttressed his
    experienced-based observations such that the trial court could
    properly find his bullet-hole theory reliable. For the experiment, the
    expert obtained two new windshields that were the same type as the
    one in Ornelas-Licano’s truck. He fired Ornelas-Licano’s gun
    through one of the windshields at approximately the same angle as
    a shot fired from the level of the truck’s stick shift. He then fired
    the gun through the second windshield at approximately the same
    angle as a shoulder-height shot. Photographs of the two test firings
    demonstrated that the shot made from the gear shift caused a
    circular bullet hole, while the test shot made from shoulder height
    caused a more elliptical hole. This kind of data was absent from
    the record in Ruibal, where the expert gave no “anecdotal, much
    less empirical, evidence supporting his conclusion.”
    Id. at ¶
    15.
    ¶ 84   Salcedo v. People, 
    999 P.2d 833
    (Colo. 2000), is similarly
    distinguishable. In that case, the supreme court held that
    testimony that a defendant matches a “drug courier profile” is not
    39
    an admissible expert opinion.
    Id. at 837.
    There, a police detective
    was qualified as an expert in “narcotics interviews,” and, based on a
    “loose profile” of behaviors and characteristics that the detective
    had constructed based on prior experience with drug couriers, the
    detective testified that he believed that Salcedo was a drug courier.
    Id. at 835
    –36.
    ¶ 85   The supreme court held that this testimony was inadmissible
    on reliability grounds because “application of the drug courier
    profile depends substantially on a subjective, if not intuitive,
    judgment that a person’s behavior and characteristics warrant
    further investigation,” and because “[the expert] based his opinion
    of Salcedo’s guilt on a subjective assessment of the ‘totality of the
    circumstances’ rather than on an articulable combination of
    behaviors and characteristics in an objective drug courier profile.”
    Id. at 838
    –39 (emphasis added).
    ¶ 86   Although both the expert in Salcedo and the expert in this
    case developed their theories based on prior experience, those
    experiences were different in kind. The expert’s theory in this case
    was not based on his subjective gut feelings, but rather on his
    objective, definable, and simple observations: there is a relationship
    40
    between a bullet’s angle of impact and the shape of hole it leaves in
    glass. Instead of analyzing many factors and variables under “the
    totality of the circumstances,”
    id. at 839,
    the expert here identified a
    more limited number of variables pertinent to his theory and then
    explained a precise result — namely, that when a bullet strikes
    glass at a nonperpendicular angle, there will be an elliptical hole.
    This is in stark contrast to the inadmissible expert opinion in
    Salcedo, which was tantamount to “I think defendant was a drug
    courier because I’ve seen drug couriers before, and he looked like
    one.” In sum, while the expert’s opinion in Salcedo was
    indeterminate and subjective,
    id., the detective’s
    opinion here was
    determinate and objective.
    ¶ 87   The officer testified as an expert about his theory of the case
    based on his experience, which was validated by the (albeit limited)
    results of his experiment with the windshields. While no scientific
    evidence was presented regarding the physics of why or how the
    angle of impact related to the shape of the bullet hole, as I read the
    supreme court’s opinion in Shreck, such scientific evidence (which
    may entail peer review and other confirmations of reliability) is not
    always required. 
    Shreck, 22 P.3d at 77-78
    .
    41
    ¶ 88   Our function is limited to determining whether a sufficient
    showing of reliability was made. It is the jury’s function to
    determine, based on cross-examination, the presentation of
    rebutting expert evidence, and all other relevant factors, whether to
    credit that testimony. COLJI-Crim. E:06 (2019); Hampton v. People,
    
    171 Colo. 153
    , 165, 
    465 P.2d 394
    , 400 (1970).
    ¶ 89   I note that the defense expert, who indisputably was qualified
    as a ballistics expert, did not dispute the central assumption of the
    prosecution expert — that the angle of impact bears a causal
    relationship with the shape of the bullet hole. Instead, the defense
    expert contended that the prosecution expert’s testimony was wrong
    (or unreliable) because there were “too many unknowns and too
    many variables in this particular case.” He testified that it was
    impossible, based on the shape of the bullet hole and the
    windshield experiment, to reach any specific conclusions about the
    location of the gun when the shot was fired.
    ¶ 90   I am mindful that it is unfair to hold a defendant’s diligence in
    calling a defense expert against the defendant, and I agree that the
    testimony of the later-called defense expert should not bear on the
    question of the admissibility under CRE 702 of the prosecution
    42
    expert’s opinions.8 Nevertheless, following a number of cases
    decided by this court, the fact that a defense expert addressed and
    disagreed with the prosecution expert’s opinions is properly
    considered for two purposes. See People v. Shanks, 
    2019 COA 160
    ,
    ¶ 41; Schuessler v. Wolter, 
    2012 COA 86
    , ¶ 73; People v. Masters, 
    33 P.3d 1191
    , 1202 (Colo. App. 2001), aff’d, 
    58 P.3d 979
    (Colo. 2002).
    ¶ 91   First, particularly when, as here, the defense expert does not
    contest the central premise or causal analysis of the prosecution
    expert, the risk that the prosecution expert’s opinions were “junk
    science,” and that the defendant was convicted on the basis of such
    junk science, is substantially ameliorated. Second, when the
    defense presents a rebutting expert, the jury has more tools to
    evaluate whether, in the end, the prosecution expert’s opinions are
    worthy of belief. (Of course, we have no way of knowing whether
    the prosecution expert’s opinions had any bearing on the jury’s
    verdict.)
    8 The defense expert did not testify at the Shreck hearing conducted
    regarding the admissibility of the prosecution expert’s testimony;
    and therefore his testimony did not bear on the trial court’s
    determination that the prosecution expert’s testimony was
    admissible under CRE 702.
    43
    ¶ 92    For these reasons, I conclude that the trial court did not abuse
    its discretion by admitting this testimony.
    B.     The Expert’s Opinions, Based on Two Potential Shooting
    Positions, Were Helpful to the Jury and Were Not Misleading
    ¶ 93    Ornelas-Licano next argues that the expert’s testimony was
    misleading and not helpful to the jury because it only addressed
    two possible shooting positions, and there were many other
    possibilities. The central issue in this case is whether Ornelas-
    Licano accidentally shot through the windshield or did so
    deliberately in an attempt to kill the officer.
    ¶ 94    Testimony by a qualified expert giving reliable opinions
    regarding the relationship between the angle of impact and the
    shape of resulting bullet holes through a windshield could help the
    jury decide whether to credit Ornelas-Licano’s account of the
    incident or the prosecutor’s theory. Therefore, based on my
    determination that the expert was qualified and that his opinions
    were sufficiently reliable to be presented to the jury, I reject
    Ornelas-Licano’s argument that the expert’s opinions could not
    have been helpful to the jury.
    44
    ¶ 95        Additionally, the expert’s testimony did not preclude the jury’s
    consideration of other possible shooting positions. Indeed, defense
    counsel emphasized these other possibilities in opening and closing.
    Therefore, the testimony was not misleading.
    C.     The Trial Court’s Findings Under CRE 702 Were Sufficient
    ¶ 96        Finally, Ornelas-Licano argues that the trial court “failed to
    make sufficient findings to support its rejection of [his] reliability
    challenge.” “[U]nder CRE 702, a trial court must issue specific
    findings as it applies the CRE 702 and 403 analyses.” 
    Shreck, 22 P.3d at 83
    . Contrary to Ornelas-Licano’s argument, the trial court
    paused the trial to hold a Shreck hearing and concluded that the
    proposed expert testimony was reliable. Moreover, as both the
    majority’s and my analysis of the admissibility of the expert
    opinions demonstrates, the trial court’s findings were sufficient for
    us to perform our appellate function. Tatum v. Basin Res., Inc., 
    141 P.3d 863
    , 869 (Colo. App. 2005).
    ¶ 97        For these reasons, I would hold that the trial court did not
    abuse its discretion by admitting the prosecution expert’s opinions
    analyzing the shape of the bullet hole in the windshield.
    45
    D.   The Results of the Windshield Experiment Were Properly
    Admitted
    ¶ 98     Ornelas-Licano separately challenges the expert’s
    qualifications to conduct the windshield experiment and the
    admission of the results of the experiment.9
    ¶ 99     As Ornelas-Licano correctly points out, the expert had no
    training or education related to conducting this specific kind of
    experiment. He had never done this before, and he cited no
    scientific literature or other support for this methodology.
    ¶ 100    However, the expert had participated in sniper trainings
    involving shooting through glass at various angles and analyzing
    the bullets’ trajectories. Further, he explained in detail the
    methodology behind the experiment, including why certain angles
    were chosen and how those angles were recreated. I conclude that
    9 It is not clear that that windshield experiment or its results are
    expert testimony subject to CRE 702. Compare People v. Caldwell,
    
    43 P.3d 663
    , 667-68 (Colo. App. 2001) (police officer determined
    paths of bullets through a car using a string and properly testified
    as a lay witness about the bullets’ trajectories), with People v.
    Stewart, 
    55 P.3d 107
    , 123-25 (Colo. 2002) (police officer’s accident
    reconstruction testimony was improperly admitted as lay
    testimony). Neither party addresses this question. Because both
    parties analyze these contentions using CRE 702 principles, I do
    the same.
    46
    this foundation was sufficient for the admission of the results of the
    experiment.
    ¶ 101   Ornelas-Licano also argues that the experiment did not
    account for other variables in play during the shooting. But as I
    discussed above, “challenges to . . . the expert’s application of
    variables [go] to the weight of the evidence, not its admissibility.”
    Shanks, ¶ 40. “Such concerns ‘are adequately addressed by
    vigorous cross-examination, presentation of contrary evidence, and
    careful instruction on the burden of proof.’”
    Id. at ¶
    12 (quoting
    People v. Campbell, 
    2018 COA 5
    , ¶ 42).
    ¶ 102   Ornelas-Licano next contends that videos documenting the
    windshield experiment were unduly prejudicial because in those
    videos the gun was fired toward the viewer. I disagree. While the
    video camera was in front of the windshield, the gun itself was not
    visible because it was being fired at an angle to the windshield (as if
    from the driver’s side). Each video simply shows a bullet hole
    appearing in the windshield and does not “suggest a decision on an
    improper basis.” People v. Clark, 
    2015 COA 44
    , ¶ 18 (quoting
    People v. James, 
    117 P.3d 91
    , 93-94 (Colo. App. 2004)). Thus, this
    47
    testimony was not “unduly prejudicial” under CRE 403. People v.
    Palacios, 
    2018 COA 6M
    , ¶ 20.
    ¶ 103   Further, for the reasons stated in the previous section, the
    experiment results and resulting testimony could have been helpful
    to the jury and were not misleading.
    ¶ 104   On these facts, the trial court did not abuse its discretion by
    admitting the windshield experiment results and the expert
    testimony relating to the experiment.
    II.   Conclusion
    ¶ 105   For these reasons, I would affirm the judgment of conviction.
    48