Leslie Crawford v. City of Bakersfield ( 2019 )


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  •                     FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    LESLIE LARAY CRAWFORD,                          No. 16-17138
    Plaintiff-Appellant,
    D.C. No.
    v.                         1:14-cv-01735-
    SAB
    CITY OF BAKERSFIELD, a municipal
    entity, and AARON STRINGER,
    Officer,                                          OPINION
    Defendants-Appellees.
    Appeal from the United States District Court
    for the Eastern District of California
    Stanley Albert Boone, Magistrate Judge, Presiding
    Argued and Submitted February 6, 2019
    San Francisco, California
    Filed December 16, 2019
    Before: Sidney R. Thomas, Chief Judge, Richard A. Paez,
    Circuit Judge, and Gary Feinerman, * District Judge.
    Opinion by Judge Feinerman
    *
    The Honorable Gary Feinerman, United States District Judge for
    the Northern District of Illinois, sitting by designation.
    2            CRAWFORD V. CITY OF BAKERSFIELD
    SUMMARY **
    Civil Rights
    The panel vacated the district court’s judgment in favor
    of defendants following a jury trial in an action brought
    pursuant to 42 U.S.C. § 1983 and state law arising from a
    police officer’s fatal shooting of plaintiff’s son, Michael
    Dozer.
    Plaintiff alleged that the district court abused its
    discretion in excluding as irrelevant her testimony about her
    percipient observations of Dozer’s past behavior, which she
    offered to prove that police officer Stringer should have
    recognized that Dozer was exhibiting signs of mental illness
    at the time of their encounter and therefore that the shooting
    was unreasonable.
    The panel held that the district court abused its discretion
    in holding that plaintiff’s proposed testimony was irrelevant
    because Stringer, at the time of the shooting, did not know
    about the past events to which plaintiff would have testified.
    The panel noted that whether a suspect has exhibited signs
    of mental illness is one of the factors a court will consider in
    assessing the reasonableness of the force used. The panel
    held that plaintiff’s testimony regarding Dozer’s past
    behavior and treatment was relevant to whether he would
    have appeared to be mentally ill on the day of the shooting,
    and therefore whether Stringer knew or should have known
    that Dozer was mentally ill.
    **
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    CRAWFORD V. CITY OF BAKERSFIELD                  3
    The panel rejected defendants’ argument that plaintiff’s
    testimony was an improper lay opinion under Rule 701
    because she lacked the expertise to offer a psychological or
    psychiatric diagnosis. The panel held that so long as plaintiff
    stopped short of opining that Dozer had a mental illness, she
    was competent to testify about her own observations of and
    experiences with her Dozer.
    The panel held that the district court’s error in excluding
    plaintiff’s testimony undercut her ability to prove a “central
    component” of her case: that a reasonable officer in
    defendant’s position would have recognized that Dozer was
    mentally ill. The panel concluded that the evidentiary error
    was not harmless, and that a new trial was warranted.
    COUNSEL
    Emily T. Kuwahara (argued), Daniel P. Wierzba, Joel
    Mallord, and Alice Hall-Partyka, Crowell & Moring LLP,
    Los Angeles, California, for Plaintiff-Appellant.
    Michael G. Marderosian (argued) and Heather S. Cohen,
    Marderosian & Cohen, Fresno, California, for Defendants-
    Appellees.
    4          CRAWFORD V. CITY OF BAKERSFIELD
    OPINION
    FEINERMAN, District Judge:
    Leslie Crawford sued the City of Bakersfield, California
    and Bakersfield police officer Aaron Stringer (together,
    “Defendants”), bringing 42 U.S.C. § 1983 and state law
    claims arising from Stringer’s fatal shooting of Crawford’s
    son, Michael Dozer. After a three-day trial, the jury returned
    a special verdict finding that Stringer did not use excessive
    force or act negligently, and the district court entered
    judgment for Defendants. Crawford appeals, contending
    that the district court abused its discretion in excluding as
    irrelevant her testimony about her percipient observations of
    Dozer’s past behavior, which she offered to prove that
    Stringer should have recognized that Dozer was exhibiting
    signs of mental illness at the time of their encounter and
    therefore that the shooting was unreasonable. We vacate the
    judgment and remand for a new trial.
    Background
    Stringer, an on-duty police officer with the Bakersfield
    Police Department, shot and killed Dozer at a gas station
    while responding to calls reporting that Dozer “had poured
    gasoline on a woman and tried to light her on fire.”
    Crawford brought this suit on her own behalf and as Dozer’s
    successor in interest, alleging Fourth Amendment excessive
    force claims under § 1983 and state law wrongful death
    claims.
    A. The Shooting
    At around 12:30 p.m. on August 6, 2014, Elsa Torres
    was filling up her tank at a gas station. Dozer approached
    Torres’s vehicle and removed the gas nozzle from the tank,
    CRAWFORD V. CITY OF BAKERSFIELD                  5
    spraying some gas on her in the process. Dozer then sprayed
    gas onto the ground around himself and set it on fire, creating
    a flame that Torres said went “maybe up to his knees.”
    Dozer also took off some of his clothes. Torres drove away,
    called 911, and told the operator that there was a man “trying
    to burn us.” While Torres was waiting for the police to
    arrive, she saw Dozer go over to the area outside a nearby
    minimart and start “knocking all the stuff down, like the
    newspaper stands and stuff.”
    Stringer was on patrol alone when he received a call
    through dispatch that “a subject at the gas station . . . had
    poured gasoline on a woman and tried to light her on fire”
    and that the woman’s children were in her car. While
    Stringer was on his way to the gas station, he received a
    second call indicating that a woman “had been lit on fire and
    that she put it out and left the scene.” It took Stringer
    “[m]aybe a couple of minutes” to get to the gas station.
    When Stringer arrived, he spoke with Torres, who by
    that point was standing about fifty feet from Dozer. Stringer
    did not observe on Torres any signs of burns, bruising, or
    other physical injury, nor did Torres say that she had been
    burned. Stringer spoke with another witness, who said that
    Dozer had poured gasoline on Torres but who did not report
    that anyone had been injured.
    Stringer testified that by the time Torres identified
    Dozer, Dozer had moved away from the gas pumps and
    toward the minimart. The closest people to Dozer were
    twenty feet away. As far as Stringer could see, Dozer did
    not have any gasoline or incendiary liquids and was not
    assaulting anyone, but instead was merely “pacing around”
    the area, looking “very agitated.” Stringer thought that
    Dozer’s behavior was “erratic” and “aggressive in general,”
    but not aggressive toward Stringer in particular. Another
    6          CRAWFORD V. CITY OF BAKERSFIELD
    person at the scene, Rosalie Montiel, testified that Dozer was
    “walking back and forth” and “looked unapproachable,” but
    that she did not see him threatening anyone. Carlos Cabrera,
    who was also at the scene, testified that Dozer was shouting,
    hitting a table with his hands, standing up, and sitting back
    down repeatedly—“kind of going around in circles.”
    Cabrera also recounted that Dozer was staring at people and
    saying “odd things.”
    When Stringer approached Dozer, he did not think Dozer
    was actively committing any crime while pacing around the
    area near the minimart. Stringer did, however, consider “the
    crime of assault with a caustic chemical” against Torres to
    still be “in progress” because it “had just occurred seconds
    . . . or minutes” before. Stringer testified that he had not
    drawn a weapon at that point and had no intention of using
    force, and that he merely wanted to talk to Dozer. Without
    waiting for backup, Stringer moved closer so that he could
    hear what Dozer was saying.
    According to Stringer, Dozer said, “You want to do this.
    Let’s go.” Stringer responded, “No, let’s not do this. I just
    want to talk to you.” Dozer’s words, along with his pacing
    and his “amped up” and “angry” demeanor, made Stringer
    think that Dozer “was challenging [him] and had intended to
    challenge [him] despite [his] clear uniform” identifying him
    as a police officer. Stringer testified that he concluded that
    Dozer was “under the influence of a narcotic and was visibly
    agitated” and that the situation would “most likely . . .
    escalate quickly,” leading him to call for expedited backup.
    By that time, however, Stringer felt that he “didn’t have the
    chance” to wait for backup, even though he knew from radio
    transmissions that it was on the way.
    Stringer stopped about twenty feet away from Dozer and
    told him to get on the ground. Stringer testified that Dozer
    CRAWFORD V. CITY OF BAKERSFIELD                  7
    then began moving toward him “very quickly,” picked up a
    horseshoe-shaped bike lock, raised it over his head, ignored
    an order to put it down, and started “charg[ing]” toward him
    “quicker than [he] could back up.”
    Stringer testified that he started backing up and drew his
    handgun. Stringer was also carrying three nonlethal
    weapons: a Taser that could fire darts at a range of up to
    twenty-six feet, pepper spray, and a collapsible baton.
    Stringer claimed that those alternatives were not viable
    because they would take too long to deploy, as Dozer was
    approaching him “with a deadly weapon,” the bike lock.
    Ultimately, less than a minute after arriving on the scene,
    Stringer shot Dozer. The first backup officer to arrive,
    George Vasquez, was pulling up in his car when he saw the
    shooting. Vasquez did not see Stringer backpedaling at any
    point. He did, however, see Dozer moving toward Stringer,
    and he believed based on Dozer’s “facial demeanor” and
    “rapid movement,” as well as the fact that Dozer was holding
    the bike lock “over his head,” that Dozer intended to harm
    Stringer. Vasquez testified that Dozer and Stringer were
    about five to ten feet apart at the time of the shooting.
    The other eyewitnesses—Cabrera, Montiel, and
    Torres—gave varying accounts of the lead-up to the
    shooting, including testimony that conflicted with each
    other’s and the officers’ accounts as to whether and how
    quickly Dozer was moving toward Stringer; whether Dozer
    was holding the bike lock at his side, holding it in his raised
    hand, or swinging it at Stringer; how close Dozer got to
    Stringer; and whether Stringer stayed put or backed away as
    Dozer approached.
    8           CRAWFORD V. CITY OF BAKERSFIELD
    B. Stringer’s Training
    As part of his training, Stringer received a Police Officer
    Standards and Training (“POST”) certification. POST
    teaches officers how to recognize symptoms of mental
    illness and respond to people demonstrating those symptoms
    without escalating the situation. As a requirement of POST,
    Stringer was taught that erratic and irrational behavior and
    attempted self-harm were indicators of mental illness. He
    was trained that when responding to a situation involving a
    person who appeared to be mentally ill, he should slow
    down, wait for backup, and consider ways of subduing the
    person using minimal force. He was also trained to
    minimize the person’s anxiety by speaking slowly, moving
    slowly, and turning down his radio.
    C. Police Practices Experts
    At trial, the parties presented testimony from dueling
    police practices experts. Crawford’s expert, Scott DeFoe,
    opined that Dozer’s “bizarre” behavior—approaching
    Torres, pouring gasoline on himself, lighting himself on fire,
    and then going over to the minimart and acting strangely—
    would have led a reasonable officer to believe that Dozer
    was “either mentally ill or experiencing a mental crisis.”
    DeFoe did, however, acknowledge that Dozer’s spraying
    gasoline on Torres and himself also could have been
    consistent with his being under the influence of drugs.
    DeFoe explained that while “officers are not going to
    diagnose someone in the field,” they are taught to recognize
    “what mental illness looks like.” DeFoe said that the
    objective when dealing with a person who may be suffering
    from mental illness is to “calm them down” and “just get
    them handcuffed, with the least amount of force possible.”
    CRAWFORD V. CITY OF BAKERSFIELD                   9
    Given this understanding of reasonable police practices,
    DeFoe concluded that Stringer did “the opposite” of what he
    should have done: “Instead of waiting for backup, instead of
    considering less than lethal options, [Stringer] immediately
    just almost at a rapid pace walked towards” Dozer. While
    recognizing that it was “prudent” of Stringer to request
    expedited backup, DeFoe faulted Stringer for failing to wait
    for backup even though “time [was] on [his] side” in light of
    the absence of continuing criminal activity. DeFoe opined
    that Dozer posed no immediate threat because he was “over
    there by himself,” with “no one else next to him,” thus
    “mak[ing] it even more compelling that you need to get a
    backup and get people before taking any action.”
    Defendants’ expert, Curtis Cope, disagreed. In Cope’s
    view, Dozer continued to pose “an immediate threat to the
    citizens” when Stringer arrived on the scene, and Dozer then
    confronted Stringer with the imminent threat of deadly force.
    Cope acknowledged that officers are trained to recognize
    signs of mental illness and respond accordingly, including
    by calling for backup and moving slowly when
    circumstances permit. Cope opined, however, that an officer
    in Stringer’s shoes could not have been expected to “think
    . . . immediately” that someone who “took a nozzle out of [a
    victim’s] gas tank, might have gotten some gasoline on her,
    put gasoline on himself, [and] started a fire right there at the
    station” was mentally ill. Accordingly, Cope concluded that
    Stringer had complied with all applicable standards and was
    “right in doing what he did.”
    D. Crawford’s Deposition Testimony Regarding
    Dozer’s Past Behavior and Treatment
    At her pretrial deposition, Crawford testified that Dozer
    suffered from schizophrenia. Dozer often talked to himself,
    and once asked Crawford, “[W]hy do these voices keep
    10         CRAWFORD V. CITY OF BAKERSFIELD
    messing with me?” After dropping out of high school during
    his senior year, Dozer lived with Crawford and her husband
    intermittently, typically staying for three to six months and
    then leaving. At other times, Dozer stayed with his sisters
    or “would just be like in the streets, wandering, talking to
    his-self.”
    Crawford recalled that Dozer had received counseling
    and various medications from a healthcare provider called
    Turning Point. The medications tended to work well for a
    time—perhaps a month—but then would stop working. In
    addition to taking him to Turning Point, Crawford and one
    of Dozer’s sisters took him on multiple occasions to the
    Mary K. Shell Mental Health Center, which Crawford
    understood to be a “crisis center.” Crawford knew that
    Dozer also went “a few times” to “3-B,” meaning the Kern
    Medical Psychiatric Inpatient Unit in Bakersfield.
    As far as Crawford was aware, Dozer’s only drug use
    was smoking marijuana “for a little while.” Dozer told
    Crawford that, at first, “the weed helped him with the voices
    that he heard,” but it eventually stopped helping, so he
    stopped using it.
    E. The District Court’s Order Excluding
    Crawford’s Testimony About Dozer’s Past
    Behavior and Treatment
    Defendants moved in limine to exclude “any reference
    that [Dozer] was schizophrenic or suffered from any mental
    illness,” arguing (as relevant here) that the evidence was
    irrelevant and an improper lay opinion. Crawford responded
    that evidence that Dozer’s behavior on the day of the
    shooting was consistent with the signs of mental illness that
    Stringer was trained to recognize was relevant to the critical
    question whether Stringer’s use of force was reasonable.
    CRAWFORD V. CITY OF BAKERSFIELD                 11
    The district court granted Defendants’ motion.
    Crawford v. City of Bakersfield, 
    2016 WL 6038954
    (E.D.
    Cal. Oct. 14, 2016). The court rejected Defendants’
    argument that any evidence of mental illness was necessarily
    irrelevant, reasoning that whether Dozer’s behavior “was
    due to being under the influence of a drug such as PCP” or
    to mental illness “is relevant to determining whether the
    force used in this instance was reasonable.” But the court
    barred Crawford from testifying about her observations of
    Dozer’s past behavior, reasoning that because Stringer had
    no prior knowledge of Dozer, Crawford’s observations were
    “not relevant to the issue of whether [Stringer] should have
    known that [Dozer’s] behavior [leading up to the shooting]
    could have been caused by mental illness.”
    F. Jury Instructions and Closing Arguments
    The court instructed the jury that, when determining
    whether Stringer used excessive force, it should “consider
    all of the circumstances known to Officer Stringer on the
    scene, including . . . whether it should have been apparent to
    Officer Stringer that the person he used force against was
    emotionally disturbed.”         During closing arguments,
    Crawford’s counsel contended that the evidence “amply
    supported” a finding that Stringer should have known that
    Dozer was emotionally disturbed. Counsel directed the
    jury’s attention to the evidence that Stringer was trained to
    recognize signs of mental illness and respond accordingly,
    as well as to the eyewitness accounts, which suggested that
    it was apparent even without training that there was
    “something wrong with Mr. Dozer.”
    In their closing argument, Defendants seized on the lack
    of evidence that Dozer was mentally ill—a lack of evidence
    resulting from the district court’s exclusion of Crawford’s
    12        CRAWFORD V. CITY OF BAKERSFIELD
    testimony regarding her observations of Dozer’s past
    behavior:
    In this court of law, the Plaintiffs have the
    burden of proof. They have to prove the case.
    Have you heard any evidence from any
    psychologist, psychiatrist, anyone that said
    Mr. Dozer had any mental illness at all? You
    haven’t heard any evidence on that. That’s
    just [Plaintiff’s counsel’s] speculation. He
    wants you to accept that Mr. Dozer was
    mentally ill and that somehow means that
    he’s to be treated differently. There’s been
    no evidence that he was mentally ill, no
    evidence at all.
    In fact, what [Plaintiff’s counsel] wants you
    to believe, well, his conduct demonstrated
    that Officer Stringer should have known that
    he was mentally ill. That conduct, as you
    heard in the evidence, is consistent with drug
    use as well, PCP use. . . .
    ....
    And, again, on this issue of mental illness, no
    evidence of that at all. Zero. If this really
    was a case about how we treated or responded
    to a mentally ill person, you would have seen
    a medical doctor, a psychiatrist, a
    psychologist come in and tell you that
    they’ve either diagnosed Mr. Dozer or that
    there was evidence of that. You’re being
    asked to speculate on that, and . . . when
    you’re asked to speculate, the Plaintiffs aren’t
    CRAWFORD V. CITY OF BAKERSFIELD                 13
    carrying their burden by proving their case by
    a preponderance of the evidence.
    The jury returned a special verdict finding that Crawford
    failed to prove that Stringer used excessive force or was
    negligent, and the district court entered judgment for
    Defendants. Crawford timely appealed.
    Discussion
    We have jurisdiction under 28 U.S.C. § 1291. Contrary
    to Defendants’ suggestion that Crawford’s notice of appeal
    is deficient because it identifies only the judgment and not
    the order granting Defendants’ motion in limine, the in
    limine order merges with the judgment and thus is properly
    before us. See Hall v. City of Los Angeles, 
    697 F.3d 1059
    ,
    1070 (9th Cir. 2012).
    “Evidentiary rulings are reviewed for abuse of
    discretion.” Wilkerson v. Wheeler, 
    772 F.3d 834
    , 838 (9th
    Cir. 2014). The district court’s application of the correct
    legal standard is an abuse of discretion if it is “illogical,”
    “implausible,” or “without support in inferences that may be
    drawn from the facts in the record.” United States v.
    Espinoza, 
    880 F.3d 506
    , 511 (9th Cir. 2018) (quoting United
    States v. Hinkson, 
    585 F.3d 1247
    , 1262 (9th Cir. 2009) (en
    banc)). In the civil context, an error will support reversal
    only if it “more probably than not tainted the verdict.”
    
    Wilkerson, 772 F.3d at 838
    (internal quotation marks
    omitted) (quoting Engquist v. Or. Dep’t of Argric., 
    478 F.3d 985
    , 1009 (9th Cir. 2007), aff’d, 
    553 U.S. 591
    (2008)).
    I. Relevance of Crawford’s Proposed Testimony
    Evidence Rule 401 provides: “Evidence is relevant if:
    (a) it has any tendency to make a fact more or less probable
    14         CRAWFORD V. CITY OF BAKERSFIELD
    than it would be without the evidence; and (b) the fact is of
    consequence in determining the action.” Fed. R. Evid. 401.
    Evidence Rule 402 provides that relevant evidence is
    admissible unless another rule or federal law provides
    otherwise, and that irrelevant evidence is inadmissible. Fed.
    R. Evid. 402. Rule 401’s “basic standard of relevance . . . is
    a liberal one.” Daubert v. Merrell Dow Pharm., Inc.,
    
    509 U.S. 579
    , 587 (1993); see also United States v.
    Whitehead, 
    200 F.3d 634
    , 640 (9th Cir. 2000) (citing
    Rule 401 for the proposition that relevance is a “minimal
    requirement”); United States v. Curtis, 
    568 F.2d 643
    , 645
    (9th Cir. 1978) (“Rule 401 . . . contains a very expansive
    definition of relevant evidence.”).
    Deciding whether a fact is “of consequence in
    determining the action” generally requires considering the
    substantive issues the case presents. See Fed. R. Evid. 401
    advisory committee’s note to 1972 proposed rules
    (“Relevancy is not an inherent characteristic of any item of
    evidence but exists only as a relation between an item of
    evidence and a matter properly provable in the case.”). Here,
    Crawford alleged that Stringer used excessive force in
    violation of the Fourth Amendment and that his actions were
    negligent under California law.
    In evaluating a Fourth Amendment excessive force
    claim, the jury asks “whether the officers’ actions were
    ‘objectively reasonable’ in light of the facts and
    circumstances confronting them.” Longoria v. Pinal Cty.,
    
    873 F.3d 699
    , 705 (9th Cir. 2017) (alteration omitted)
    (quoting Graham v. Connor, 
    490 U.S. 386
    , 397 (1989)).
    That analysis requires balancing the “nature and quality of
    the intrusion on the individual’s Fourth Amendment
    interests against the countervailing governmental interests at
    stake.” Vos v. City of Newport Beach, 
    892 F.3d 1024
    , 1030
    CRAWFORD V. CITY OF BAKERSFIELD                  15
    (9th Cir. 2018) (quoting 
    Graham, 490 U.S. at 396
    ). “The
    ‘reasonableness’ of a particular use of force must be judged
    from the perspective of a reasonable officer on the scene,
    rather than with the 20/20 vision of hindsight.” 
    Id. at 1031
    (quoting 
    Graham, 490 U.S. at 396
    ). The “three primary
    factors” in assessing the government’s interest are (1) “the
    severity of the crime at issue,” (2) “whether the suspect
    poses an immediate threat to the safety of the officers or
    others,” and (3) “whether the suspect is actively resisting
    arrest or attempting to evade arrest by flight.” 
    Id. (alteration and
    internal quotation marks omitted). These factors are not
    exclusive. 
    Id. at 1033.
    Crawford’s wrongful death claim turned on similar
    considerations. To prevail on her negligence theory,
    Crawford had to show that Stringer “had a duty to use due
    care, that he breached that duty, and that the breach was the
    proximate or legal cause of the resulting injury.” Hayes v.
    Cty. of San Diego, 
    305 P.3d 252
    , 255 (Cal. 2013) (quoting
    Nally v. Grace Cmty. Church of the Valley, 
    763 P.2d 948
    ,
    956 (Cal. 1988)). Under California law, “peace officers have
    a duty to act reasonably when using deadly force.” 
    Id. at 256.
    “The reasonableness of an officer’s conduct is
    determined in light of the totality of circumstances.” 
    Id. California’s totality-of-the-circumstances
    inquiry includes
    pre-shooting circumstances and thus “is broader than federal
    Fourth Amendment law, which tends to focus more narrowly
    on the moment when deadly force is used.” 
    Id. at 263;
    accord Mulligan v. Nichols, 
    835 F.3d 983
    , 991 (9th Cir.
    2016) (“[N]egligence claims under California law
    encompass a broader spectrum of conduct than excessive
    force claims under the Fourth Amendment.”).
    The district court correctly held that evidence of Dozer’s
    mental illness was relevant because the reasonableness of
    16          CRAWFORD V. CITY OF BAKERSFIELD
    Stringer’s use of deadly force depended in part on whether
    he knew or should have known that Dozer’s behavior was
    caused by mental illness. Although we have “‘refused to
    create two tracks of excessive force analysis, one for the
    mentally ill and one for serious criminals,’ our precedent
    establishes that if officers believe a suspect is mentally ill,
    they ‘should make a greater effort to take control of the
    situation through less intrusive means.’” 
    Vos, 892 F.3d at 1034
    n.9 (alterations omitted) (quoting Bryan v.
    MacPherson, 
    630 F.3d 805
    , 829 (9th Cir. 2010)).
    Accordingly, “whether the suspect has exhibited signs of
    mental illness is one of the factors the court will consider in
    assessing the reasonableness of the force used, in addition to
    the Graham factors, the availability of less intrusive force,
    and whether proper warnings were given.” Id.; see also
    Glenn v. Washington Cty., 
    673 F.3d 864
    , 875 (9th Cir. 2011)
    (“Another circumstance relevant to our analysis is whether
    the officers were or should have been aware that [the
    individual] was emotionally disturbed.”); Deorle v.
    Rutherford, 
    272 F.3d 1272
    , 1283 (9th Cir. 2001) (“Even
    when an emotionally disturbed individual is ‘acting out’ . . . ,
    the governmental interest in using [deadly] force is
    diminished by the fact that the officers are confronted, not
    with a person who has committed a serious crime against
    others, but with a mentally ill individual.”).
    The district court abused its discretion, however, in
    holding that Crawford’s proposed testimony was irrelevant
    on the ground that Stringer, at the time of the shooting, did
    not know about the past events to which Crawford would
    have testified. Crawford’s testimony regarding Dozer’s past
    behavior and treatment was relevant to whether he was in
    fact mentally ill at the time. Evidence that Dozer had
    previously behaved in ways consistent with mental illness
    and had been taken to mental health providers for treatment,
    CRAWFORD V. CITY OF BAKERSFIELD                 17
    makes it more likely that he continued to suffer from mental
    illness on the day of the shooting. In turn, whether Dozer
    was in fact mentally ill that day is relevant to whether he
    would have appeared to be mentally ill, and thus to whether
    Stringer knew or should have known that Dozer was
    mentally ill; after all, the existence of some underlying fact
    tends to make it more likely that a person knew or should
    have known that fact. See United States v. James, 
    169 F.3d 1210
    , 1214–15 (9th Cir. 1999) (en banc) (holding that
    documents corroborating the stories that the defendant
    claimed the decedent told her about the decedent’s past acts
    of violence were relevant to her self-defense argument even
    though she had never seen the documents, reasoning that the
    truth of the decedent’s stories made it more likely (1) that he
    had told them and (2) that the stories “had the ring of truth”
    to the defendant). Thus, Crawford’s testimony about
    Dozer’s past behaviors and treatment was relevant even
    though Stringer had no knowledge of them. See Boyd v. City
    & Cty. of San Francisco, 
    576 F.3d 938
    , 944 (9th Cir. 2009)
    (“[W]here what the officer perceived just prior to the use of
    force is in dispute, evidence that may support one version of
    events over another is relevant and admissible.”); see also
    Estate of Escobedo v. Martin, 
    702 F.3d 388
    , 400 (7th Cir.
    2012) (explaining that “evidence unknown to officers at the
    time force was used” may be relevant in evaluating
    credibility, such as by making it more or less likely that “a
    suspect acted in the manner described by the officer”).
    Accordingly, the district court abused its discretion in
    excluding Crawford’s proposed testimony under Rules 401
    and 402.
    18         CRAWFORD V. CITY OF BAKERSFIELD
    II. Alternate Ground for           Excluding     Crawford’s
    Proposed Testimony
    On appeal, Defendants contend that Crawford’s
    testimony was an improper lay opinion under Rule 701
    because she lacked the expertise to offer a psychological or
    psychiatric diagnosis. That argument misses the point. As
    Crawford notes, she was “not attempting to testify that her
    son was diagnosed with schizophrenia.” And as the district
    court correctly held, Crawford was competent to testify as a
    lay witness “regarding her observations of” Dozer’s past
    behavior. Thus, so long as Crawford stopped short of
    opining that Dozer had a mental illness, she was competent
    to testify about her own observations of and experiences
    with Dozer. See Frisone v. United States, 
    270 F.2d 401
    , 403
    (9th Cir. 1959) (distinguishing between a witness’s
    admissible lay testimony “as to his faulty recollection and
    poor memory” and inadmissible “testimony as to the
    existence or treatment of a mental illness serious enough to
    cause permanent memory impairment,” and noting that
    “only expert testimony will be allowed on technical
    questions of causation”).
    III.   Prejudicial Error
    Defendants contend that any error in excluding
    Crawford’s testimony was harmless. In a civil case, an
    evidentiary error is prejudicial if it “more probably than not
    tainted the verdict.” 
    Wilkerson, 772 F.3d at 838
    (quoting
    Engquist v. Or. Dep’t of Agric., 
    478 F.3d 985
    , 1009 (9th Cir.
    2007), aff’d, 
    553 U.S. 591
    (2008)). Here, the district court’s
    error undercut Crawford’s ability to prove a “central
    component” of her case: that a reasonable officer in
    Stringer’s position would have recognized that Dozer was
    mentally ill. See 
    id. at 841.
    The importance of the excluded
    CRAWFORD V. CITY OF BAKERSFIELD                  19
    testimony makes “the likelihood of prejudice . . . difficult to
    overcome.” 
    Id. As noted,
    the district court instructed the jury to consider
    “whether it should have been apparent to Officer Stringer
    that the person he used force against was emotionally
    disturbed.” Granted, that factor appeared in a list of nine
    nonexclusive factors for determining whether Stringer’s use
    of force was reasonable.           But given the facts and
    circumstances of this case, we have little doubt that it played
    an important role in the jury’s verdict.
    Excluding Crawford’s testimony was prejudicial in at
    least three ways. First, evidence suggesting that Dozer was
    in fact mentally ill “could have provided the missing link to
    establish” that a reasonable officer in Stringer’s position
    would have realized that Dozer was mentally ill. 
    Espinoza, 880 F.3d at 519
    . Without that link, Crawford had to ask the
    jury to find that Stringer should have known something she
    was unable to prove directly.
    Second, DeFoe’s opinion that Stringer should have
    recognized Dozer’s mental illness almost certainly would
    have carried more weight had Crawford been able to present
    evidence indicating that Dozer was in fact mentally ill. That
    is particularly so given DeFoe’s acknowledgement that at
    least some of Dozer’s behavior could also have been
    consistent with his being under the influence of drugs—a
    theory that Defendants seized on in their closing argument.
    Crawford’s testimony would have bolstered DeFoe’s
    opinion by making it more likely that Dozer’s behavior was
    in fact a result of mental illness and thus more likely that his
    behavior would have been viewed as such by a reasonable
    officer at the scene. See Geurin v. Winston Indus., Inc.,
    
    316 F.3d 879
    , 885 (9th Cir. 2002) (holding that the district
    court’s erroneous exclusion from a products liability trial of
    20          CRAWFORD V. CITY OF BAKERSFIELD
    evidence that the product was improperly maintained by
    non-parties “tainted the verdict” in that it prevented the
    defendant “from providing the jury with an alternative
    explanation,” thus “preordain[ing]” the jury’s verdict that a
    design defect was the accident’s sole proximate cause).
    Third, Crawford’s testimony would have deprived
    Defendants of a powerful component of their closing
    argument—their submission that Crawford’s mental illness
    theory had “[z]ero” evidentiary support.              Granted,
    Defendants could still have suggested in closing that if
    Dozer had truly been mentally ill, “you would have seen a
    medical doctor, a psychiatrist, a psychologist come in and
    tell you that they’ve either diagnosed Mr. Dozer or that there
    was evidence of that.” But Defendants would not have been
    able to argue that “[t]here’s been no evidence that he was
    mentally ill, no evidence at all.” “[A]s this court has
    recognized, ‘closing argument matters a great deal.’” United
    States v. Bailey, 
    696 F.3d 794
    , 805 (9th Cir. 2012) (alteration
    omitted) (quoting United States v. Kojayan, 
    8 F.3d 1315
    ,
    1323 (9th Cir. 1993)). Defendants’ emphasis in their closing
    on the lack of evidence that Dozer was in fact mentally ill
    reinforces its centrality to Crawford’s case.
    Defendants’ argument that the error was harmless is
    without merit. Reversing course from what they told the jury
    in their closing, Defendants submit that there was so much
    evidence of mental illness—the testimony about Stringer’s
    training to recognize mental illness, DeFoe’s opinion that a
    reasonable officer would have concluded that Dozer was
    mentally ill, and the eyewitness testimony that Dozer
    appeared disturbed—that Crawford’s excluded testimony
    was unlikely to have made a difference to the verdict. But
    as discussed above, the evidence that Crawford was allowed
    to present carried far less weight than it would have had she
    CRAWFORD V. CITY OF BAKERSFIELD                21
    been able to provide testimony indicating that Dozer was in
    fact mentally ill.
    The case cited by Defendants to support their harmless
    error argument, Smith v. City & Cty. of Honolulu, 
    887 F.3d 944
    , 953 (9th Cir. 2018), is distinguishable. In Smith, we
    held that an improper reference during closing argument to
    a “tub of additional substances” supposedly found on the
    plaintiff’s property was “unlikely to have swayed the
    jury”—which had, after all, heard witnesses characterize the
    property as a drug warehouse—and was therefore harmless.
    
    Id. Here, by
    contrast, Crawford does not contend that
    Defendants’ closing argument was improper; rather, she
    contends that Defendants’ emphasis on the absence of the
    erroneously excluded evidence in their closing demonstrates
    the importance of that evidence.
    Finally, Defendants make a strawman argument,
    suggesting that Crawford “would like this Court to take the
    position that any use of deadly force against an individual
    who is mentally ill is always unreasonable or unlawful.”
    That is not what Crawford argues, nor do we adopt that
    position simply by protecting her ability to offer relevant
    evidence to prove an important but not dispositive factor in
    the excessive force analysis.
    Accordingly, the district court’s evidentiary error was
    not harmless, and a new trial is warranted. The parties shall
    bear their own costs.
    VACATED and REMANDED.