United States v. Fagan ( 2023 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 21-1758
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    DAMON FAGAN,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MAINE
    [Hon. D. Brock Hornby, U.S. District Judge]
    Before
    Kayatta, Howard, and Thompson,
    Circuit Judges.
    Noreen McCarthy for appellant.
    Benjamin M. Block, Assistant United States Attorney, with
    whom Darcie N. McElwee, United States Attorney, was on brief, for
    appellee.
    Zachary L. Heiden, Carol J. Garvan, Gilles R. Bissonnette,
    Matthew Warner, and Preti Flaherty LLP, on brief for amici curiae
    American Civil Liberties Union of Maine Foundation, American Civil
    Liberties Union of New Hampshire Foundation, and American Civil
    Liberties Union of Massachusetts, Inc.
    June 15, 2023
    KAYATTA, Circuit Judge.     A traffic stop on the Maine
    Turnpike for unsafe operation of a vehicle led to the discovery of
    evidence showing that Damon Fagan was carrying heroin with the
    intent to distribute it.    Seeking to suppress that evidence, Fagan
    argued in the district court that the officer who pulled him over
    lacked a sufficient basis for suspecting that Fagan had committed
    a motor vehicle violation, and that his detention and interrogation
    following the traffic stop otherwise violated his constitutional
    rights.     After the district court denied his motion to suppress,
    Fagan pled guilty while reserving his right to appeal the refusal
    to suppress the evidence found in the traffic stop.         For the
    following reasons, we affirm the denial of Fagan's motion to
    suppress.
    I.
    On January 6, 2019, shortly before 11:00 p.m., Fagan and
    a passenger were driving north on the Maine Turnpike, followed by
    Maine State Trooper John Darcy.   The record supports an inference,
    and the district court assumed, that the reason Darcy chose to
    follow Fagan was because Fagan, a Black man, fit Darcy's profile
    of what he calls "thugs" whom he suspects of drug dealing.    After
    running Fagan's tag numbers and learning that the vehicle was a
    registered rental car from a location in Presque Isle (much further
    north in Maine than where Darcy and Fagan were driving at that
    time), Darcy continued to follow Fagan. A few minutes later, while
    - 2 -
    Fagan was traveling in the right lane, Darcy saw Fagan enter the
    middle lane to pass a tractor-trailer and then move back into the
    right lane in front of the tractor-trailer.              Darcy then pulled
    Fagan over.       This stop resulted in over an hour and a half of
    questioning, and concluded with Fagan relinquishing 37 grams of
    heroin that he was carrying on his person.               When later charged
    with possession with intent to distribute, Fagan moved to suppress
    the evidence garnered from the traffic stop, arguing that the stop
    was illegal and that his Fourth and Fifth Amendment rights were
    violated by the subsequent police questioning.
    The contest at the suppression hearing initially focused
    on whether Darcy had a sufficient basis to pull Fagan over.            Fagan
    did not testify, so all the evidence came from Darcy, a video taken
    by a dashcam in the police cruiser, and Darcy's body camera that
    activated after the cars stopped.
    The    district   court    found   Darcy's    testimony   to   be
    credible.    That testimony was as follows:
    Fagan's car was between a tractor-trailer and Darcy's
    car in the right lane as Fagan's vehicle closed on the tractor-
    trailer.    Fagan's car then moved left into the adjoining lane to
    accelerate past the tractor-trailer.            "[J]ust as" Fagan's car
    passed the tractor-trailer, Fagan's car "cut off" the tractor-
    trailer by moving back into the right lane without signaling before
    crossing the lane line "very close to the front of the tractor-
    - 3 -
    trailer, not leaving much space for any reaction time," and not
    leaving "a safe distance in between as it cut in front of the
    vehicle."    Darcy further described the lane change by noting that
    Fagan had "turned into that lane close enough in front of that
    tractor trailer that if [he] had to stop short[] [he] would have
    caused a collision, most likely."            Darcy "acknowledge[d]" that
    "the truck never put its brake lights on" and "never swerved."               He
    also stated he did not know "[w]hether the [trucker] had to
    downshift to avoid [Fagan]."
    The video, taken from a less advantageous angle on the
    passenger side of Darcy's vehicle, prompted the district court to
    agree that the move back to the right lane was "abrupt."                Having
    viewed the video,1 we do not find this characterization clearly
    erroneous.    The video also confirms Darcy's testimony that Fagan
    commenced the lane change without first signaling.              On the other
    hand, it does not make clear the distance between Fagan's vehicle
    and the tractor-trailer at the time of the lane change.             The video
    does not show the front of the tractor-trailer, which Darcy
    acknowledged in his testimony.           And it also confirms that the
    tractor-trailer did not brake.           Ultimately, the district court
    determined that the video was not conclusive either way on the
    1   The video is accessible at https://www.ca1.uscourts.gov/citationsmedia.
    - 4 -
    safety of the lane change, and we do not find this to be clearly
    erroneous either.
    Darcy himself was not able to put a specific number on
    the distance between Fagan's car and the tractor-trailer at the
    time of the lane change other than to say that the vehicles were
    separated by "very little distance" and the change occurred "just
    as" Fagan's car passed the tractor-trailer.      Nor was he able to
    estimate Fagan's precise speed when Fagan passed the tractor-
    trailer.   Darcy did agree that the video shows that approximately
    one second after the pass was completed, Fagan was "three or four
    car lengths" in front of the tractor-trailer.      Fagan agrees that
    the lane change took roughly four to five seconds from when Fagan
    began to move right until he completed the change (approximately
    the same amount of time as Fagan's initial lane change into the
    middle lane).
    After the two cars pulled over, Darcy approached Fagan's
    vehicle.    At the time, Darcy believed -- incorrectly -- that
    changing lanes without first signaling was in and of itself a
    violation of Maine's traffic laws.      He accused Fagan of both not
    signaling and cutting off the tractor-trailer.       ("You just cut
    that truck off.   You didn't put on your turn signal until you were
    already in the lane.")   When Fagan was unable to produce a license,
    Darcy had Fagan exit the vehicle and then patted him down, finding
    a knife.   In response to questioning by Darcy, Fagan stated that
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    he was on bail and his driver's license was suspended.           He said
    that he and his passenger were coming from shopping in Kittery,
    Maine.    Separately questioned, the passenger said they were coming
    from Connecticut where they dropped off a niece and Fagan visited
    a friend.
    Darcy next learned via a computer check that Fagan's
    license was indeed suspended, that he had prior drug trafficking
    involvement, and that he was on bail.         Darcy also learned that
    Fagan's bail conditions imposed a 7:00 p.m. curfew, prohibited
    Fagan from leaving Maine, and subjected him to searches of his
    person "at any time without articulable suspicion or probable
    cause."    Subsequent questioning led to the production of 37 grams
    of heroin, which Fagan retrieved from between his buttocks after
    dog sniffs of both the vehicle and its passengers, multiple rounds
    of questioning, and a body search by Darcy.
    Surveying the foregoing, the district court concluded
    that "a reasonable officer" in Darcy's position "could believe
    that there was probable cause for this traffic stop."           The court
    therefore held that the stop did not violate the Fourth Amendment.
    The   district   court   also   rejected   Fagan's   argument   that   the
    discovery of the heroin was the product of improper detention and
    questioning.
    Over a year after the district court denied Fagan's
    suppression motion, Fagan's lawyers discovered new evidence that
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    had not been available at the time of the initial hearing.               The
    new evidence included a taped conversation between Darcy and
    another officer recorded after Fagan's arrest, at the time of an
    arrest of another person made by Darcy, as follows:
    Darcy: Like if I see a white thug, I'm going
    to be interested, just like a Black thug, or
    a fuckin' Chinese thug. Like, I'm interested
    in thugs.     We don't, that's not racial
    profiling. Like, some Black guy goes by, and
    he's just some normal dude from Portland, I
    don't give a fuck, you know what I mean? Like
    whatever. This guy kind of looks like a thug,
    to be honest with you.
    Other Trooper:       You see the guy driving?
    Darcy:   Yeah.   He's wearing a wife-beater,
    he's got dreads, he looks like a thug, he may
    not be. And I'm not profiling him racially,
    because I don't care that he's white, Black.
    White kid, neck tats all over him, fucking
    sideways hat, thug, you know what I mean? So
    like I get . . . I hate when people try to
    make it seem like that's what it is. I care
    about where people are from, and the way they
    seem, do you know what I mean? Like, do they
    seem like they could be involved in the drug
    game, or gangs, or something, you know what I
    mean? I don't give a fuck if somebody's Black,
    white, like . . . And I like saying this,
    Nicole has a fucking niece who is half Black,
    I'll tell someone like, my niece is half-
    Black, don't play that racial shit with me.
    The district court noted, and the government agrees on
    appeal, that using racial profiling to selectively enforce the law
    violates      the     Fourteenth   Amendment       to   the   United   States
    Constitution.       Both parties also agreed below -- and agree on
    appeal   --    that    the   existence   of    a   racially   discriminatory
    - 7 -
    motivation for a stop and search provides no basis for suppressing
    evidence gathered in the search if there was otherwise sufficient
    cause for the stop and search.           See Whren v. United States, 
    517 U.S. 806
    , 813 (1996).
    The    district      court        nevertheless     recognized      the
    possibility   that   evidence    of     an    officer's     racial   bias   could
    undercut the officer's credibility in reporting on the actions
    taken by the target of his selective hunt.                  So it agreed to a
    limited reopening of the suppression hearing to receive the new
    evidence and to consider anew whether Darcy's description of
    Fagan's driving was credible.           The court concluded that Darcy's
    description remained credible.          In short, even though it assumed
    Darcy had been motivated to follow Fagan and to find a reason to
    stop him because Darcy believed that persons fitting Fagan's
    profile were "thugs," the court reaffirmed its finding that Darcy's
    description of Fagan's driving was credible. And the court further
    reaffirmed that that even though it "[could not] determine actual
    separation distance between the two vehicles," it did "not find
    that Darcy lied in giving the unsafe lane change explanation" and
    once again denied the motion to suppress.
    Fagan subsequently entered a conditional plea of guilty
    on   August 18,   2021,   and   was     sentenced    to   twenty-one    months'
    imprisonment and an additional three years of supervised release.
    - 8 -
    The terms of his plea agreement reserved his right to appeal the
    decision not to suppress the heroin found on him.
    II.
    A.
    We consider first the stop of the car driven by Fagan,
    starting with the applicable law.           When Darcy pulled Fagan over,
    he effected a "seizure" of Fagan within the meaning of the Fourth
    Amendment.     Brendlin v. California, 
    551 U.S. 249
    , 255–59 (2007).
    Both parties agree that to justify such a seizure for a traffic
    violation the officer must have a "reasonable suspicion" that the
    person stopped is breaking the law.          Heien v. North Carolina, 
    574 U.S. 54
    , 60 (2014).    A mere hunch is not enough; on the other hand,
    the level of proof required is "'obviously less' than is necessary
    for probable cause."       Navarette v. California, 
    572 U.S. 393
    , 397
    (2014) (quoting United States v. Sokolow, 
    490 U.S. 1
    , 7 (1989));
    see also United States v. Romain, 
    393 F.3d 63
    , 71 (1st Cir. 2004)
    ("[T]he showing required to meet this standard is considerably
    less demanding than that required to make out probable cause.").
    In     gauging    whether    the    circumstances   generate   a
    reasonable suspicion, we apply "an objective standard, rather than
    assessing the subjective intent of an individual officer."         United
    States v. Tiru-Plaza, 
    766 F.3d 111
    , 116 (1st Cir. 2014).           We are
    restricted to asking whether a hypothetical reasonable officer
    - 9 -
    considering what Darcy observed2 would reasonably suspect that
    Fagan had operated his vehicle unsafely in violation of Maine's
    traffic laws.      See 
    id.
    In     this   case,     the    relevant       traffic    laws    are    those
    prohibiting     unsafe    lane     changes.        See     Me.     Rev.    Stat.    Ann.
    tit. 29-A, § 2070.1 ("Passing on left.                   An operator of a vehicle
    passing another vehicle proceeding in the same direction must pass
    to the left at a safe distance and may not return to the right
    until    safely     clear     of     the        passed     vehicle.");       § 2071.1
    ("Prohibition.      An operator may not turn a vehicle or move right
    or left on a public way unless the movement can be made with
    reasonable safety.").        In Maine, failing to signal before changing
    lanes is not per se an infraction.                See Pooler v. Clifford, 
    639 A.2d 1061
    , 1062 (Me. 1994).          Whether and when a signal is made can
    bear, however, on whether the lane change is safe.                    See 
    id.
    B.
    Given the foregoing controlling law, Fagan's Fourth
    Amendment challenge to his conviction turns on whether the district
    court committed reversible error in finding that the circumstances
    gave rise to a reasonable suspicion that Fagan changed lanes in an
    unsafe manner. In addressing that question, we employ a bifurcated
    2  The government makes no claim that any other officer knew
    or observed anything that should be included in our analysis of
    the initial stop.
    - 10 -
    standard of review.      First, as to any issues of fact (here, what
    happened), we must accept the district court's factual findings
    absent clear error.      Tiru-Plaza, 
    766 F.3d at 114-15
    .     In so doing,
    we need not accept illogical findings, Mitchell v. United States,
    
    141 F.3d 8
    , 17 (1st Cir. 1998), or mere guesswork, McGuire v.
    Reilly, 
    260 F.3d 36
    , 45–46 (1st Cir. 2001).         But we must consider
    the facts in the light most favorable to the district court's
    ruling, United States v. Fermin, 
    771 F.3d 71
    , 76 (1st Cir. 2014).
    Importantly for purposes of this appeal, our review must be
    "'especially deferential' to the district court's evaluation of
    witnesses' credibility."       United States v. Sierra-Ayala, 
    39 F.4th 1
    , 13 (1st Cir. 2022) (quoting United States v. Jones, 
    187 F.3d 210
    , 214 (1st Cir. 1999)).         Thus, "absent objective evidence that
    contradicts a witness's story or a situation where the story itself
    is so internally inconsistent or implausible that no reasonable
    factfinder would credit it, 'the ball game is virtually over' once
    a district court determines that a key witness is credible."             
    Id.
    (quoting United States v. Guzmán-Batista, 
    783 F.3d 930
    , 937 (1st
    Cir. 2015)).
    Second, as to issues of law (most notably, whether the
    facts viewed in the light most favorable to the district court's
    decision   gave   rise    to   a   reasonable   suspicion   of   a   traffic
    violation), we proceed afresh, albeit in drawing these legal
    conclusions we must "give appropriate weight to the inferences
    - 11 -
    drawn by the district court and on-scene officers, recognizing
    that they possess the advantage of immediacy and familiarity with
    the witnesses and events."             Tiru-Plaza, 
    766 F.3d at 115
    ; see
    Ornelas v. United States, 
    517 U.S. 690
    , 699 (1996) (we must "give
    due weight from inferences drawn from [the] facts by resident
    judges and local law enforcement officers.")                Our charge is to ask
    what a hypothetical reasonable officer would have thought of the
    situation, not to accept automatically Darcy's ultimate conclusion
    that Fagan drove unsafely.         But once the district court accepts an
    officer's testimony as credible -- which the district court did
    here   --   absent    evidence   to    the      contrary,   we    must   treat   the
    officer's    report    of   what      he    saw   as   evidence     of   what    the
    hypothetical reasonable officer would have seen. See, e.g., United
    States v. Dion, 
    859 F.3d 114
    , 127 & n.10 (1st Cir. 2017) (affirming
    district     court's    finding       that      officer     was   credible,      and
    considering defendant's nervousness, which officer had testified
    to, in evaluating legality of a stop); United States v. Gilliard,
    
    847 F.2d 21
    , 24–25 (1st Cir. 1988) (affirming district court's
    credibility finding and taking officer observations into account
    to determine that stop was justified).
    C.
    We return now to Darcy's description of what he saw.
    Darcy testified that without first signaling, Fagan "cut
    in" to the right lane in front of the tractor-trailer, "leaving
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    very little distance between the two," such that it would likely
    have caused a crash had Fagan needed to stop quickly.    Darcy also
    explained that there was "not . . . a lot of traffic, [and] there
    was no need for the vehicle to cut over immediately."   Fagan points
    out that Darcy could not state the actual distance in feet or yards
    between the rear of Fagan's car and the front of the tractor-
    trailer.    But it did appear to Darcy -- then a state trooper whose
    job entailed surveilling turnpike traffic -- to be "very close."
    See Tiru-Plaza, 
    766 F.3d at 116
     (granting "respect to the ability
    of trained and experienced police officers to draw from the
    attendant circumstances inferences that would 'elude an untrained
    person.'" (quoting United States v. Cortez, 
    449 U.S. 411
    , 418
    (1981))).    Darcy also agreed that Fagan's car was approximately
    "three or four car lengths" in front of the tractor-trailer
    "roughly one second" after Fagan completed the lane change. Fagan,
    in turn, was moving faster than the tractor-trailer shortly after
    he completed his pass (as evidenced by the video, which shows Fagan
    moving away and quickly leaving enough space for Darcy's cruiser
    to pass in front of the tractor-trailer).   And as Fagan's brief on
    appeal states, the lane change from start to finish took roughly
    four to five seconds. Taking all these facts together, and viewing
    them (as we must) in the light most favorable to the conclusion
    reached by the district court, see Fermin, 
    771 F.3d at 76
    , we agree
    with the district court that a reasonable officer could have
    - 13 -
    suspected    that    Fagan   executed      an   unsafe   lane   change.   In
    particular, a reasonable officer could have suspected that Fagan
    was quite a bit closer than three to four car lengths when he began
    moving abruptly into the tractor-trailer's lane without first
    signaling.
    Simple   math    shows   why   such   a   qualitative   suspicion
    generated by these facts is reasonable.            Start with the fact that
    Fagan's car was three to four car lengths in front of the truck
    about one second after Fagan had completed the pass.                  As the
    dissent fairly estimates, that is 45–60 feet, which we will assume
    is a safe distance.3     Key then is how much closer the two vehicles
    were roughly five to six seconds earlier when the lane change
    commenced (since, as Fagan's brief states, the change itself took
    four to five seconds).       The answer depends on how much faster Fagan
    was traveling than was the tractor-trailer.               As Fagan and the
    dissent note, the record does not contain direct evidence of either
    driver's speed.      But the video visibly shows Fagan driving faster
    as he passed the tractor-trailer (how else to pass it).             The video
    also shows that when Darcy got to the front of the tractor-trailer,
    3   This assumption is generous to Fagan given that the
    National Highway Traffic Safety Administration warns that it takes
    1.5 seconds to react and hit the brakes and a typical vehicle going
    55 miles per hour travels 121 feet in 1.5 seconds. See U.S. Dep't
    of Transp. Nat'l Highway Traffic Safety Admin., Safety 1n Num3ers
    (August 2015), https://one.nhtsa.gov/nhtsa/Safety1nNum3ers/august2015/S1N_A
    ug15_Speeding_1.html (last visited June 9, 2023).
    - 14 -
    Fagan was by then well more than three to four car lengths away
    (i.e., he was going quite a bit faster than the truck), and Darcy
    agreed at the suppression hearing that Fagan's car was "moving
    further away from the tractor trailer" after the pass.             That is to
    say, having been moving visibly faster than the tractor-trailer in
    order to pass it, Fagan's car gave no indication that it did not
    maintain   that    greater     speed    throughout      the     lane     change.
    Conservatively    assuming     just    a    five   mile   per     hour    speed
    differential, and conservatively assuming that the elapsed time
    was five seconds, not six, the math is as follows:
    5 𝑚𝑖𝑙𝑒𝑠 5280 𝑓𝑒𝑒𝑡      ℎ𝑜𝑢𝑟
    ×          ×              × 5 𝑠𝑒𝑐𝑜𝑛𝑑𝑠 = 36.67 𝑓𝑒𝑒𝑡 𝑐𝑙𝑜𝑠𝑒𝑟
    ℎ𝑜𝑢𝑟     𝑚𝑖𝑙𝑒      3600 𝑠𝑒𝑐𝑜𝑛𝑑𝑠
    In short, given the facts drawn from Darcy's testimony,
    along with the video footage, one could estimate that at the time
    Fagan began to abruptly move back into the slow lane without first
    signaling, the distance between the vehicles may have been very
    tight; i.e., it could have been as little as between 9 and 24 feet
    (45 to 60 feet minus 36 feet).         The dissent does not dispute that
    the methodology represented by this equation properly converts
    Fagan's position when Darcy got to the front of the tractor-trailer
    to Fagan's position when he commenced the lane change.                 Instead,
    the dissent challenges only the values assigned to two variables
    -- the speed differential between Fagan's vehicle and the tractor-
    - 15 -
    trailer, and the amount of time that it took to complete the lane
    change.
    As to the latter, the dissent contends that we should
    use one second rather than five.         But one second was the time
    between the completion of the lane change and the time at which
    Fagan was viewed three to four car lengths in front.         The relevant
    time is the four to five seconds that Fagan admits passed from the
    beginning to end of his move into the slow lane in front of the
    truck, plus the additional second that elapsed before Fagan was
    three to four car lengths away from the truck.
    That leaves only the speed differential.          If the dissent
    were correct that there was no difference in speeds during and
    following the pass, then the pass must have begun with a three to
    four vehicle gap.   So, too, though, if the speed differential were
    anything like five miles per hour, then the belatedly signaled
    lane change began with only a 9 to 24 foot gap. And even the
    dissent does not argue that Darcy could not reasonably suspect
    such a lane change to be unsafe.
    The   video   bears   twice    on   the   issue   of   the   speed
    differential.   First, although it does not reveal the vehicles'
    precise speeds, it shows that Fagan's car was clearly going visibly
    faster than the tractor-trailer just before it began the lane
    change.   Second, it provides no support for the counter-intuitive
    - 16 -
    possibility that Fagan did not maintain or even increase that
    greater speed throughout the lane change.
    Our dissenting colleague posits that maybe the tractor-
    trailer sped up when its driver saw Fagan in its lane.     But if
    that had happened, Fagan would still have been three to four car
    lengths ahead when Darcy got beside the tractor-trailer.   And the
    video plainly shows that Fagan by that point was even further in
    front of the tractor-trailer; i.e., he was still going faster than
    the tractor-trailer.
    None of this is to suggest that Darcy did the math.
    Rather, it is to show that the facts in the record -- such as they
    are -- reasonably accommodate his qualitative assessment as an
    experienced state trooper of the abrupt lane change as being "too
    close."    And given all of this, we cannot say that the district
    court erred in concluding that a reasonable officer in Darcy's
    position could have reasonably suspected he had witnessed unsafe
    driving.
    Nor is this conclusion belied by Darcy's agreement that
    the stop lights on the tractor-trailer did not flash, nor did that
    vehicle otherwise appear to alter course.   That strongly suggests
    that the driver of the tractor-trailer felt no danger.     But the
    absence of a discernable reaction by the tractor-trailer driver
    does not necessarily mean that a person in Darcy's position could
    not reasonably assess the safety of Fagan's move differently.   The
    - 17 -
    "reasonable suspicion" required to justify a traffic stop does not
    require certainty or even correctness, and reasonable people can
    disagree on what is objectively safe. See United States v. Arvizu,
    
    534 U.S. 266
    , 277 (2002). That Darcy and the driver of the tractor-
    trailer may have disagreed as to whether Fagan cut off the tractor-
    trailer does not necessarily mean that either Darcy or the driver
    of the tractor-trailer was unreasonable.
    D.
    Recognizing the importance of Darcy's credibility in the
    foregoing analysis, Fagan and his supporting amici train their
    focus on Darcy's state of mind.    In so doing, Fagan stresses that
    he is "not arguing for suppression because of Darcy's reprehensible
    racial profiling."   Rather, Fagan makes the more subtle argument
    that Darcy's bias and his eagerness for a drug bust should have
    precluded the district court from giving credence to Darcy's
    version of what transpired. And were Darcy's testimony discounted,
    there would remain no sufficient basis from which one could
    generate reasonable suspicion of a traffic violation.
    We agree with Fagan's contention that evidence of an
    officer's racial bias in deciding which drivers to surveil and
    stop can undercut the credibility of the officer's description of
    the facts that supposedly justified the stop.    The district court
    did not reject this contention.    To the contrary, it reopened the
    suppression hearing precisely to accept the new evidence tendered
    - 18 -
    by Fagan and to consider again Darcy's credibility.               In the
    district court's words, "[t]he question before [the court] on the
    reopened motion [was] whether Darcy lied in saying that Fagan
    executed an unsafe return to the right-hand lane."         In turn, the
    district court made clear that in answering that question, the
    court considered all of the new evidence, and assumed that Darcy
    "singled out Fagan's vehicle for improper reasons as it went
    through the York toll plaza."    The district court also made clear
    its plainly correct view that "racial profiling is reprehensible."
    Unfortunately   for   Fagan,   after   hearing   all   the   new
    evidence and extended questioning of Darcy, the district court
    found that "irrespective of Darcy's personal motivation, I do not
    find that Darcy lied in giving the unsafe lane change explanation."
    In explaining this conclusion, the district court focused on two
    facts upon which the parties agreed: (1) at the time of the arrest,
    Darcy wrongly thought that failing to signal before initiating a
    lane change was per se a violation of the motor vehicle laws; and
    (2) the video confirmed that Fagan initiated his lane change in
    front of the tractor-trailer without first signaling.        Therefore,
    reasoned the district court, Darcy had no reason to fabricate his
    - 19 -
    contemporaneous          description   recorded     on    his   dashcam    of   the
    closeness of the lane change in order to justify the stop.4
    So Fagan is left to argue that we should reject as clear
    error the district court's express finding that Darcy was credible.
    Fagan points out that after his motion was denied, another judge
    found Darcy not to be "a very credible witness."                   But of course
    the judge in this earlier case could not have known that.                   And the
    fact that a witness's credibility is found lacking in one case
    does not mean that his testimony must be retroactively deemed not
    credible as a matter of law in other cases.               Nor does it constitute
    the kind of "objective evidence that contradicts [Darcy's] story"
    to which he testified in this particular case that we would need
    to overturn a credibility finding on appeal.                 Guzmán-Batista, 
    783 F.3d at
      937–38     (determining   that    where    defendant      presented
    "compelling evidence" of his version of events, but that evidence
    "create[d] two possible alternative version of the events," the
    district court's choice between those alternatives could not be
    deemed clearly erroneous).
    Finally,     the   dissent      implicitly      assails    Darcy's
    credibility by questioning Darcy's characterization of the lane
    change as cutting off the tractor-trailer at so close a distance
    4Darcy stated when he first spoke to Fagan after pulling
    him over: "You just cut that truck off. You didn't put on your
    turn signal until you were already in the lane."
    - 20 -
    as to create an "almost-crash situation."        The dissent then
    suggests that Darcy's characterization exaggerates how close the
    vehicles came, and thus undercuts Darcy's testimony.       But the
    district court -- which viewed the video and observed Darcy testify
    -- found Darcy credible on the issue of whether he had seen Fagan
    make an unsafe lane change.    Ultimately, not even the dissent can
    argue that we are not effectively bound by the district court's
    opinion that Darcy was credible.
    *       *    *
    To summarize, three rules of law that we must apply drive
    our holding: (1) a stop for a mere traffic violation, even when
    supported only by a reasonable suspicion that such a violation
    occurred, does not violate the Fourth Amendment, Heien, 574 U.S.
    at 60; (2) racial profiling, while a violation of the Fourteenth
    Amendment, does not trigger the exclusionary rule as it might were
    it a Fourth Amendment violation, Whren, 
    517 U.S. at 813, 819
    ; and
    (3) district courts must be given broad leeway in determining the
    credibility of witnesses who testify before them, Sierra-Ayala, 39
    F.4th at 13.    Given these rules, we must affirm the district
    court's holding that Darcy did not violate the Fourth Amendment in
    pulling over Fagan's vehicle for a traffic violation.
    III.
    We turn next to Fagan's alternative Fourth and Fifth
    Amendment arguments for barring the government from using as
    - 21 -
    evidence the heroin recovered during the stop.                      Fagan challenges
    the length of his detention at the roadside and the continued
    questioning and searches that led eventually to his retrieval of
    the drugs from between his buttocks.                   He claims that his prolonged
    detention and the aggressive and repeated questioning (both before
    and    after    Miranda       warnings     were     given)      violated   his   Fourth
    Amendment right to be free of unreasonable seizures and Fifth
    Amendment       right    not    to    be    coerced      into    making    statements,
    respectively.
    We need not decide whether officers detained Fagan too
    long   or   coerced      the    production        of    the   drugs.       Rather,    the
    controlling law is clear that evidence found unlawfully is not
    excluded if it would have inevitably been discovered anyhow through
    lawful means.      United States v. Almeida, 
    434 F.3d 25
    , 28 (1st Cir.
    2006).      We ask three questions when evaluating an inevitable
    discovery argument:            "[F]irst, whether the legal means by which
    the evidence would have been discovered was truly independent;
    second, whether the use of the legal means would have inevitably
    led to the discovery of the evidence; and third, whether applying
    the inevitable discovery rule would either provide an incentive
    for    police    misconduct      or    significantly          weaken   constitutional
    protections."           
    Id.
         An    arrest   is      "truly    independent"    of    an
    interrogation if "(1) the police, in fact, would have arrested the
    defendant, even without first having discovered the challenged
    - 22 -
    evidence, and (2) in the absence of the challenged evidence, the
    officers nevertheless had probable cause to make the arrest without
    the challenged evidence."        
    Id.
       The government has the burden to
    show the exception applies.
    The district court made findings that directly support
    its conclusion that discovery of the drugs was inevitable.           First,
    the   officers   had   ample    grounds   --   lawfully   obtained   during
    "ordinary inquiries incident to [the traffic] stop" -- to arrest
    Fagan.    Rodriguez v. United States, 
    575 U.S. 348
    , 355 (2015)
    (quoting Illinois v. Caballes, 
    543 U.S. 405
    , 408 (2005)).                In
    brief, after stopping Fagan and asking for his driver's license,
    and procuring a quick criminal history search,5 Darcy learned that
    Fagan had prior involvement with illegal drugs, that he was out on
    bail, that he was violating the conditions of his release on bail
    by being out after 7 p.m. and by likely having left Maine, and
    that as a condition of his release he had agreed to be subject to
    search without cause.          Second, the officers would have indeed
    arrested Fagan -- as Darcy told him -- had he not produced any
    drugs, and the standard search at the jail would have discovered
    the drugs. Third, since the officers knew that they could lawfully
    arrest Fagan, and that he had consented to searches as a condition
    of bail, the potential for incentivizing unlawful detentions in
    5 See Rodriguez, 575 U.S. at 355 (checking for outstanding
    warrants is an ordinary inquiry pursuant to a traffic stop).
    - 23 -
    other cases was mitigated.   Based on the foregoing, the district
    court concluded that, once Darcy learned that Fagan had been
    involved with illegal drugs, was driving with a suspended license,
    and was violating his bail conditions, the discovery of the drugs
    would have been inevitable even had the officers conducted no
    further search or questioning at the scene.   In so concluding, the
    court committed no clear error.
    IV.
    Finally, we turn to Fagan's argument that the district
    court erred in denying his motion for discovery regarding other
    stops Darcy had made.   Fagan argues that he could have impeached
    Darcy's credibility by showing that he stopped minority drivers at
    a statistically higher rate if the district court had allowed this
    discovery.
    On its face, the proposed discovery seems aimed at
    proving something that the district court already presumed to be
    true: that Darcy's singling out of Fagan was racially motivated.
    In any event, we agree with the government that this challenge is
    waived, because Fagan pled guilty and did not identify this
    discovery order as one he reserved the right to appeal.        The
    conditional plea agreement only identifies the rulings on the
    motion to suppress as appealable, with no reference to the ruling
    on Fagan's discovery motion.    A separate hearing was held and a
    separate order issued on Fagan's discovery motion, and this order
    - 24 -
    was not identified in the conditional plea.    Any challenge to an
    order not specified in the conditional guilty plea is waived by
    the plea.    Federal Rule of Criminal Procedure 11(a)(2) allows a
    defendant to enter a conditional guilty plea, "reserving in writing
    the right, on appeal from the judgment, to review of the adverse
    determination of any specified pretrial motion" (emphasis added).
    See United States v. Ramos, 
    961 F.2d 1003
    , 1005–06 (1st Cir. 1992),
    overruled on other grounds by United States v. Caron, 
    77 F.3d 1
    (1st Cir. 1996).     Because Fagan's motion was not specified, his
    challenge is waived.
    V.
    For the foregoing reasons, the judgment of the district
    court is affirmed.
    - Dissenting Opinion Follows -
    - 25 -
    THOMPSON,   Circuit   Judge,   dissenting.    The   majority
    concludes that objective facts and rational inferences point to a
    reasonable suspicion that Fagan made an unsafe lane change —
    something the government had the burden of proving.       See, e.g.,
    United States v. Monteiro, 
    447 F.3d 39
    , 43 (1st Cir. 2006).        But
    I could not disagree more.      What follows is my best effort to
    explain why.
    I
    Drug cases often follow a familiar pattern.           Police
    officers stop a car for a traffic offense, even a minor one —
    driving is so heavily regulated that officers have nearly endless
    chances to stop anyone they want:     experience shows "that no local
    police force can strictly enforce the traffic laws, or it would
    [pull over] half the driving population on any given morning."
    See Robert Jackson, The Federal Prosecutor, Address Delivered at
    the Second Annual Conference of United States Attorneys (Apr. 1,
    1940), quoted in Morrison v. Olson, 
    487 U.S. 654
    , 727-28 (1988)
    (Scalia, J., dissenting); see also United States v. Magallon-
    Lopez, 
    817 F.3d 671
    , 676 (9th Cir. 2016) (Berzon, J., concurring)
    (mentioning Whren v. United States, 
    517 U.S. 806
    , 810 (1996)).
    Citing some exception to the rule against warrantless searches,
    officers then find drugs in the car or on the driver.         Which in
    turn leads to federal drug charges.        And if a judge does not
    suppress the drugs — because, say, the judge finds the specific
    - 26 -
    facts known to the officers gave rise to an objectively reasonable
    suspicion of illegal activity — the driver-turned-defendant enters
    a   conditional   guilty   plea    that   reserves   the   stop   issue   for
    appellate review.
    Our case — involving Darcy's tailing Fagan's car for
    miles (after it drove through the toll area without incident)
    solely because of Fagan's race (as no one really disputes) —
    presents   a   troubling   twist    on    this   general   storyline.     See
    generally Atwater v. City of Lago Vista, 
    532 U.S. 318
    , 372 (2001)
    (O'Connor, J., dissenting) (stating that, "as the recent debate
    over racial profiling demonstrates all too clearly, a relatively
    minor traffic infraction may often serve as an excuse for stopping
    and harassing an individual").6            But put aside Darcy's racist
    6The majority mentions (in a block quote above) how Darcy
    shared with a trooper colleague his thoughts and feelings about
    people who (in his view) look like "thugs."     The reader may be
    interested in knowing that Terrel Walker was Darcy's looks-like-
    a-thug driver.      Walker, Darcy said, "was a [B]lack male,
    approximately late 20s at the time," who was wearing a "wife
    beater" — i.e., "a thin undershirt tank top." Darcy spotted Walker
    as he (Walker) rolled through the toll booth on I-95, ran his
    license plate, followed him, stopped him for "[f]ailing to keep
    right except for overtaking or passing," and smelled marijuana. A
    drug-sniffing dog alerted officers to the presence of narcotics.
    And officers found cocaine and fake Xanax pills. Facing federal
    drug charges, Walker asked the district court to dismiss the
    indictment given Darcy's targeting him because of his race (a
    violation of the Fourteenth Amendment's Equal Protection Clause)
    or to suppress the evidence given his lack of reasonable suspicion
    for the stop (a violation of the Fourth Amendment's search-and-
    seizure clause). See Whren, 
    517 U.S. at 513, 519
     (indicating that
    a racial-bias issue like this is an equal-protection problem, not
    a search-and-seizure problem). But the government then moved to
    - 27 -
    motives. I say that because (as the majority correctly says) Fagan
    chose to attack the reasonableness of Darcy's suspicion (a search-
    and-seizure issue), not Darcy's racially-selective conduct (an
    equal-protection issue).      Which (as intimated earlier) means the
    key question is whether the record facts and their fairly-drawn
    inferences   paint   a   picture   sufficient   to   raise   an   officer's
    reasonable suspicion that Fagan changed lanes unsafely.              Again,
    unlike the majority, I answer that question with a hard no (even
    assuming for argument's sake that Darcy testified credibly).
    II
    Time for some background legal principles, most of which
    the majority touched on.
    A
    1
    To justify a car stop, an officer must have at least a
    reasonable suspicion — i.e., "specific and articulable facts . . .
    taken together with rational inferences from those facts" — that
    a traffic offense occurred.        See Terry v. Ohio, 
    392 U.S. 1
    , 21
    (1968); see also United States v. Miles, 
    18 F.4th 76
    , 79 (1st Cir.
    2021).   Judges look at all the circumstances in a commonsense way
    to see if a particularized and objective basis — viewed from the
    perspective of an objectively reasonable officer — existed for
    dismiss the indictment, saying that outcome "would be in the best
    interests of justice" — a motion the district court granted.
    - 28 -
    suspecting illegality.       See, e.g., United States v. Arvizu, 
    534 U.S. 266
    , 277 (2002); Illinois v. Wardlow, 
    528 U.S. 119
    , 125
    (2000).    That standard requires something less than probable cause
    — but something more than gut feelings or unvoiced hunches.                    See,
    e.g., Wardlow, 
    528 U.S. at 123-24
    .            And the government bears the
    burden of proving it.      See, e.g., Monteiro, 
    447 F.3d at 43
    .
    2
    Inference-drawing        plays    a     starring    role      in   the
    majority's analysis.      So a word or two about it is in order.
    An inference is reasonable if it flows from the basic
    facts in evidence.      See, e.g., Terry, 
    392 U.S. at 21
    .            To put the
    point another way, it "is a reasoned, logical decision to conclude
    that a disputed fact exists on the basis of another fact [that is
    known to exist]."       See Bickerstaff v. Vassar Coll., 
    196 F.3d 435
    ,
    448 (2d Cir. 1999) (brackets in original and emphases added)
    (quoting a leading treatise on federal jury instructions).                      So
    guesswork is     not    a reasonable inference, to give an obvious
    example.    See, e.g., 
    id.
    B
    1
    We   give   fresh-eyed    de     novo   review     to   the   judge's
    reasonable-suspicion       ruling    but     clear-error       review     to   his
    underlying fact-findings, see Miles, 18 F.4th at 78 — all while
    "assess[ing] the record evidence in the light most favorable" to
    - 29 -
    the decision, see United States v. Perez, 
    977 F.3d 163
    , 168 (1st
    Cir. 2020).
    2
    Of all the concepts raised in the preceding sentence,
    clear error needs some attention given the importance the majority
    and the government place on it.
    The first thing to know is that clear error is not a
    particularly illuminating term.       And don't just take my word for
    it — take Judge Learned Hand's too.7      "It is," he wrote, "idle to
    try to define the meaning of th[at] phrase . . .; all that can be
    profitably said" is that a reviewing court — "though it will
    hesitate less to reverse" a judge-finding than a jury-finding —
    "will nevertheless reverse it most reluctantly and only when well
    persuaded."    See United States v. Aluminum Co. of Am., 
    148 F.2d 416
    , 433 (2d Cir. 1945).
    But while clear error's meaning "is not immediately
    apparent," we can pick out "certain general principles" from the
    caselaw.   See Anderson v. City of Bessemer City, 
    470 U.S. 564
    , 573
    (1985).    Chief among them is that a finding is clearly erroneous
    if we "definite[ly] and firm[ly]" decide that the judge made a
    7 For anyone into rankings, Judge Hand "is considered by many
    the third-greatest judge in the history of the United States, after
    [Oliver Wendell] Holmes and John Marshall; some might even rate
    him higher." Richard A. Posner, The Learned Hand Biography and
    the Question of Judicial Greatness, 
    104 Yale L.J. 511
    , 511 (1994)
    (book review).
    - 30 -
    "mistake" — even where "there is evidence to support" the finding.
    See United States v. U.S. Gypsum Co., 
    333 U.S. 364
    , 395 (1948);
    see also McGuire v. Reilly, 
    250 F.3d 36
    , 45-46 (1st Cir. 2001);
    Irving v. United States, 
    49 F.3d 830
    , 836 (1st Cir. 1995).                   So,
    for example, a finding is clearly erroneous if the judge accepts
    a witness's version of events that is illogical or contradicted by
    other physical evidence.         See Mitchell v. United States, 
    141 F.3d 8
    , 17 (1st Cir. 1998); Irving, 
    49 F.3d at 835
    .             Or, to use another
    example,   a    finding     is   also   clearly   erroneous    if   the   judge
    "settl[es] for guesswork" instead of "reason[ing] from facts."
    See McGuire, 250 F.3d at 46 (emphases added).
    On    the      degree-of-deference     scale,    clear   error     is
    "conventionally regarded" as a less deferential model than abuse
    of discretion.       See Haugh v. Jones & Loughlin Steel Corp., 
    949 F.2d 914
    , 916-17 (7th Cir. 1991) (Posner, J., for the court).                And
    while the standard is "formidable, it is not" (to use a different
    metaphor) "a juggernaut that crushes everything in its path."                See
    Uno v. City of Holyoke, 
    72 F.3d 973
    , 978 (1st Cir. 1995); see also
    Jose Santiago, Inc. v. Smithfield Packaged Meats Corp., 
    66 F.4th 329
    , 340-41 (1st Cir. 2023).
    A key takeaway then is that clear-error review — though
    certainly respectful — is not (to use yet another metaphor) a one-
    way   ticket    to   an   affirmance.      See,   e.g.,    United   States    v.
    Henderson, 
    463 F.3d 27
    , 44-45 (1st Cir. 2006) (vacating on clear-
    - 31 -
    error review a judge-finding made after a suppression hearing);
    United States v. Forbes, 
    181 F.3d 1
    , 7-8 (1st Cir. 1999) (same).
    III
    Now time for a recap of Darcy's testimony (given at both
    hearings) and the judge's reasoning (reflected in both decisions)
    for denying Fagan's suppression motion.
    A
    Tracking Fagan's travels just because (to quote the
    majority) "Fagan, a Black man, fit Darcy's profile" of a drug-
    dealing "thug[]," Darcy eventually drove up behind him.                   Fagan at
    that point was behind a tractor trailer.                  And all three (Darcy,
    Fagan, and the trucker) were in the slow lane.
    According to Darcy, Fagan then moved to the middle lane,
    passed the truck, and switched back to the slow lane.8                     No one
    disputes that Darcy was still behind the tractor trailer when Fagan
    made       the    switch-back   and   so    could   not    see    that   maneuver.
    Unsurprisingly then, Darcy could not specify the distance between
    Fagan and the trucker when the switch-back occurred. Perhaps eager
    to fill in that gap, Darcy still said that "very little distance"
    separated "the two" at that critical moment.                     Darcy added that
    Fagan had gotten back in "that lane close enough in front of that
    tractor trailer that if [he (Fagan)] had to stop short[] [he] would
    Like the parties and the majority, I use "tractor-trailer,"
    8
    "tractor trailer," and "truck" interchangeably.
    - 32 -
    have caused a collision, most likely."               And Darcy later said that
    about "a second" after the switch-back, he could see Fagan's car
    "maybe three or four car lengths" ahead of the truck.
    Looking to score points, the defense got Darcy to admit
    that he only saw Fagan's "whole vehicle for the first time" once
    he (Darcy) moved to the center lane.             The defense later asked Darcy
    whether    he   based    his   unsafe-lane-change         assessment      "on   [the]
    distance between the truck and the vehicle" — to which he answered,
    "[y]es, . . . it was the manner in which [Fagan] essentially, for
    lack of a better term, cut off the tractor trailer, changing into
    [the slow] lane too close to the tractor trailer."                   But then when
    asked by the defense whether he "could[] measure how many feet
    [Fagan] was in front of the truck," Darcy replied he "could not
    . . ., that is correct."           Nor could Darcy estimate Fagan's speed
    when he (Fagan) got in front of the tractor trailer.                        And when
    asked by the defense to "acknowledge in the [dashcam] video that
    . . . you can never see the actual front of the truck," Darcy came
    back with "[c]orrect."9          Darcy also agreed with the defense that
    he believed that Fagan "almost crashed into" the tractor trailer,
    but "acknowledge[d]" that "the truck never put its brakes on" and
    9   Again, the video is accessible at https://www.ca1.uscourts.gov/citationsmedia.
    - 33 -
    "never swerved."      "Whether the [trucker] had to downshift to avoid
    [Fagan]" Darcy did not know either.
    B
    Denying the suppression motion, the judge at one point
    framed the relevant issue as "whether Darcy lied in saying that
    Fagan executed an unsafe return to the right-hand lane."                     That
    mattered, the judge wrote, because "[i]f Fagan's maneuver was not
    unsafe, then the hypothetical reasonable police officer had no
    basis to pull him over."         Paraphrasing the testimony, the judge
    noted that Darcy said that Fagan
    cut off the tractor trailer, that it was very
    close to the front of the tractor trailer, not
    leaving much space for any reaction time, did
    not leave a safe distance in between as it cut
    in front of the vehicle, and if it had to stop
    shortly it would have caused a collision most
    likely.
    And the judge ultimately found Darcy's account "credible," even
    after "[a]ssuming" he (Darcy) "singled out Fagan's vehicle for
    improper reasons as it went through the . . . toll plaza."
    Convinced that the dashcam video did not "contradict[]"
    Darcy's testimony, the judge noted that the footage "appear[ed]"
    to show "that [Fagan's] return to the right lane was abrupt."                The
    judge   also    noted   that   the     video   never    showed   the   trucker
    "activating his brakes or taking evasive maneuvers." But the judge
    discounted     that   fact   because   he   had   "no   idea   how   alert   the
    [trucker] was or how aggressively he drove."            So the judge did not
    - 34 -
    consider the video conclusive either way on the safety question.
    And even though the judge "[could not] determine the actual
    separation distance between the two vehicles," he held "the traffic
    stop was lawful."
    IV
    Time then for my take on the issue.
    A
    From the just-given recap one can see that Darcy tied
    his unsafe-lane-change theory to Fagan's supposedly cutting off
    the tractor trailer at so close a distance as to create an almost-
    crash   situation    —   an    account    the    judge    credited   in   finding
    reasonable suspicion.         The majority and the government offer lots
    of   reasons   why   they     think    the      judge's   reasonable-suspicion
    conclusion holds together.        But none is convincing, at least by my
    lights.
    B
    1
    Picking up on one of the government's arguments — an
    argument centered on downplaying how the truck blocked Darcy's
    view of Fagan's switch-back — the majority points to Darcy's
    testimony that about a second after Fagan's return to the slow
    lane, he could see Fagan's car maybe "three or four car lengths"
    ahead of the truck.       Ignore for present purposes that the record
    - 35 -
    never says what Darcy meant by car length.10                 And assume for
    argument's sake that Darcy had in mind 15 feet, which is roughly
    the length of the average car.          See Susan Meyer, Study:       Average
    Car Size is Increasing — Will Roads Still be Safe for Small Cars
    and Pedestrians?, https:www.thezebra.com/resources/driving/avera
    ge-car-size (last visited June 8, 2023).               So Darcy essentially
    said that Fagan was about 45 to 60 feet ahead of the truck a second
    after the pass.11     Neither the majority nor the government argues
    — and the judge never found — that that amount of space is too
    small for a safe lane change. Instead the majority (emphasis mine)
    contends that we should infer that Fagan must have been "quite a
    bit closer" than that to the truck.             The theory goes something
    like this (the quotes come from the majority):           "[T]he lane change
    from    start   to   finish   took    roughly   four    to   five   seconds."
    "[A]ssuming just a five mile per hour speed differential," and
    supposing "that the elapsed time was five seconds, not six," the
    It does not take an automotive engineer to know that cars
    10
    come in many sizes.   According to one website, a "mini-car" is
    about 10 feet long, a "mid-sized car" is about 15 feet long, a
    "full-sized car" is about 16 feet long, a "small SUV" is about 14
    feet long, and a "large SUV" is about 17 feet long. See Gerard
    Stevens, Average Car Length: All You Need to Know About It, Way,
    https://www.way.com/blog/average-car-length (last visited June 8,
    2023).
    To give a sense of perspective, a gap of 45 to 60 feet is
    11
    (roughly) equivalent to a typical 4 to 6 story building laid on
    its side.     See How Tall is a Storey in Feet?, Skydeck,
    https://theskydeck.com/how-tall-is-a-storey-in-feet (last visited
    June 8, 2023). That is no small thing, to state the obvious.
    - 36 -
    majority "estimate[s] that at the time Fagan began" the "abrupt[]"
    switch-back, "the distance between the vehicles may have been very
    tight; i.e., it could have been as little as between 9 and 24
    feet." The majority then coats its theory with the veneer of (what
    it calls) "simple math":
    5 𝑚𝑖𝑙𝑒𝑠 5280 𝑓𝑒𝑒𝑡      ℎ𝑜𝑢𝑟
    ×          ×              × 5 𝑠𝑒𝑐𝑜𝑛𝑑𝑠 = 36.67 𝑓𝑒𝑒𝑡 𝑐𝑙𝑜𝑠𝑒𝑟
    ℎ𝑜𝑢𝑟     𝑚𝑖𝑙𝑒      3600 𝑠𝑒𝑐𝑜𝑛𝑑𝑠
    "45 to 60 feet minus 36 feet" gets you to "between 9 and 24 feet,"
    the majority writes.        But the majority can get no mileage from
    that argument.
    (i)
    Stepping back, some things are clear.
    First,    given    the   distance   between    Fagan's    car   and
    Darcy's cruiser, with an intervening truck and all three vehicles
    basically going straight, one cannot — simply by watching the
    dashcam video — reasonably calculate the space between Fagan's
    auto and the truck's front when Fagan switched to the slow lane.
    Indeed the judge (recall) admitted that he could not make that
    determination.     But one can see that the trucker did not react as
    a trucker reasonably could be expected to react after an almost-
    crash-causing cut off. The video shows no brake lights, no swerve,
    no sign of any engine slowdown, for example.
    The majority concedes that that list of nos "strongly
    suggests that the [trucker] felt no danger."             But the majority
    - 37 -
    (emphasis mine) theorizes that perhaps the trucker "may have
    disagreed" with Darcy about "whether Fagan cut off the [truck]" in
    an unsafe way, then adding too that "reasonable people can disagree
    on what is objectively safe."        Call me unconvinced.      Keeping in
    mind that our review of the evidence must be commonsensical, see
    Wardlow, 
    528 U.S. at 125
    , I think it strains common sense to
    suggest that a reasonable trucker faced with an almost-crash set-
    up (which is how Darcy described it) would not react in some way.
    What the majority is doing is relying on a hunch or a guess instead
    of facts or rational inferences drawn from facts — the "may have
    disagreed" language is a tip off.           And (to repeat) reasonable
    suspicion — while not the toughest of standards — certainly demands
    more.    See 
    id. at 124
    ; see also McGuire, 
    260 F.3d at 46
    ; United
    States v. Espinoza, 
    490 F.3d 41
    , 48 (1st Cir. 2007).
    Echoing the judge's reasoning, the government (but not
    the majority) supposes — without any supporting evidence — that
    the trucker may have, might have, or could have driven carelessly
    or aggressively.      But as just explained, sheer speculation — which
    is all this really is (Darcy, for instance, never testified that
    the trucker drove improperly) — affords no basis for assuming that
    something that could have possibly occurred actually did occur.
    See Wardlow, 
    528 U.S. at 123-24
    ; McGuire, 
    260 F.3d at 46
    ; Espinoza,
    
    490 F.3d at 48
    .       See generally Gomez v. Stop & Shop Supermarket
    Co.,    
    670 F.3d 395
    ,   398   (1st   Cir.   2012)   (stressing   that
    - 38 -
    "[a]ssumptions are not a substitute for evidence"); Jane Doe No.
    1 v. Backpage.com LLC, 
    817 F.3d 12
    , 25 (1st Cir. 2016) (warning
    about   the    folly    of   "pyramid[ing]     speculative    inference        upon
    speculative inference").
    Second,   while   the    government   (but   not     so   much    the
    majority) alludes to some hints in Darcy's testimony that he had
    a better vantage than his dashcam, the fact remains that he offered
    no (as in zero) facts showing the distance between Fagan's auto
    and the truck at the time of the lane switch — only conclusory
    characterizations of the vehicles being "too close," "close enough
    . . . that if the [truck] had to stop short it would have caused
    a collision, most likely," and there being "very little distance
    between the two."         Critically as well, Darcy (recall) conceded
    that he could not estimate the distance between Fagan's car and
    the truck when Fagan passed in front of it.            And he (recall also)
    conceded that he only saw Fagan's "whole vehicle for the first
    time" once he (Darcy) moved to the center lane following Fagan's
    return to the slow lane.              As the party burdened with showing
    reasonable suspicion, the government had every incentive — and
    opportunity — to pin the separation distance down.                 That it could
    not speaks volumes.
    Third,    while   the    government   (but     not    really      the
    majority) makes much of the judge's remark that the dashcam video
    did "not contradict[]" Darcy's story, Darcy's concessions — his
    - 39 -
    not being able to estimate the distance between Fagan and the truck
    or Fagan's speed (after Fagan moved back to the slow lane), and
    his not seeing (at that critical juncture) the trucker flash his
    brake lights or take evasive action — undermine any suggestion of
    an unsafe lane change based on a near-crash cut off.   See generally
    Anderson, 
    470 U.S. at 574
     (telling appellate courts to confirm
    that the judge's findings are "permissible" or "plausible in light
    of the record viewed in its entirety" (emphases added)).
    Fourth, while the government (but not the majority)
    implies that the dashcam video "corroborated" all of Darcy's
    unsafe-lane-change testimony because the footage supported his
    late-turn-signal claim, any such argument fails.         First off,
    everyone knows — as a matter of legal logic and common sense —
    that a witness may be credible on some issues but not on others.
    See generally First Circuit Pattern Criminal Jury Instructions
    § 1.06 (making clear that when it comes to witness credibility,
    factfinders "may believe everything a witness says or only part of
    it or none of it" (emphasis added)); see also generally Peak v.
    United States, 
    353 U.S. 43
    , 46 (1957) (noting that "common sense
    often makes good law").   But the larger point is that while the
    video does confirm Darcy's claim of a late signal, it does not (as
    I keep saying) confirm his claim of a too-close lane change that
    resulted in an almost-crash episode.     And neither does Darcy's
    - 40 -
    testimony read in its entirety, including most importantly his
    (much-discussed) concessions.
    (ii)
    This brings me back to the majority's central thesis
    (resembling the government's, and built on a hoped-for inference)
    that Fagan must've been "quite a bit closer than three to four car
    lengths when he began moving abruptly into the tractor-trailer's
    lane."    Making what it thinks is a "[c]onservative[]" assumption
    that Fagan was going just 5 miles per hour faster than the trucker,
    the majority (as noted) uses this formula to show that there "could
    have been as little as between 9 and 24 feet" separating the
    vehicles when Fagan began the switch-back and so drove unsafely:
    5 𝑚𝑖𝑙𝑒𝑠 5280 𝑓𝑒𝑒𝑡      ℎ𝑜𝑢𝑟
    ×          ×              × 5 𝑠𝑒𝑐𝑜𝑛𝑑𝑠 = 36.67 𝑓𝑒𝑒𝑡 𝑐𝑙𝑜𝑠𝑒𝑟
    ℎ𝑜𝑢𝑟     𝑚𝑖𝑙𝑒      3600 𝑠𝑒𝑐𝑜𝑛𝑑𝑠
    The majority gets between 9 and 24 feet by subtracting 36 feet
    from 45 to 60 feet.
    "Garbage in, garbage out" is a concept familiar to
    mathematicians. It means (in less vivid terms) that a faulty input
    produces a faulty output.        See Garbage in, garbage out, Wikipedia,
    https://en.wikipedia.org/wiki/Garbage_in,_garbage_out                       (last
    visited June 8, 2023).           And the majority runs into that very
    problem — i.e., the appearance of precision suggested by the
    majority's calculations is illusory, because bad info (which we
    - 41 -
    have here) assures a bad result, proving that a formula is only as
    good as the data behind it.
    One of the majority's key assumptions is that Fagan could
    not have been 3 to 4 car lengths ahead of the trucker when he
    (Fagan) crossed the dashed-lane lines during the switch-back.
    Another is that the trucker's speed did not change as Fagan
    completed   the   merge.    But   why   should   anyone   accept   either
    assumption?    Darcy offered no testimony and the judge made no
    finding on how far ahead of the trucker Fagan was as he crossed
    back into the trucker's lane.       Ditto on how fast Fagan and the
    trucker were going during that critical time. So in the majority's
    fact-free world of conjecture (at least on the crucial questions),
    nothing would stop us from instead supposing that as Fagan crossed
    the dashed-lane lines separating the middle and slow lanes — after
    already being 45 to 60 feet ahead of the truck — the trucker then
    matched the 5-miles-per-hour increase.12         Such an increase would
    12  Interestingly, going by the standard broken-line-
    interstate-highway-measurement method, it seems like the distance
    at the point of Fagan's lane change was around 60 feet. See U.S.
    Dep't of Trans., Manual on Uniform Traffic Control Devices for
    Streets and Highways, Pt. 3, Ch. 3A, § 3A.06, Guidance 04 (2009)
    (explaining that each dashed-lane should be "10" feet long and
    "30" feet apart); see also Me. Dep't of Trans., Traffic Engineering
    Striping & Stenciling Handbook 4 (2019) (noting that a "[b]roken
    line pavement marking[] . . . is 10 foot long" and "separated by
    30 foot long gaps," though "[o]n the freeway" it "would be . . .
    15 feet long with 25 foot gaps").
    - 42 -
    cancel out Fagan's, changing the first numerator in the majority's
    equation from 5 miles to 0 miles:
    0 𝑚𝑖𝑙𝑒𝑠 5280 𝑓𝑒𝑒𝑡       ℎ𝑜𝑢𝑟
    ×          ×              × 5 𝑠𝑒𝑐𝑜𝑛𝑑𝑠 = 0 𝑓𝑒𝑒𝑡 𝑐𝑙𝑜𝑠𝑒𝑟
    ℎ𝑜𝑢𝑟     𝑚𝑖𝑙𝑒      3600 𝑠𝑒𝑐𝑜𝑛𝑑𝑠
    That would turn the majority's 9 to 24 feet differential claim
    into a 45 to 60 feet differential claim.              Which (in other words)
    would leave a 3 to 4 car length separation distance right after
    the switch-back — a distance not even the government says is
    unsafe.13
    Next consider the majority's choice to use 5 seconds in
    its formula — i.e., the time it took for the switch-back, from
    13 Trying to refute these details, the majority (emphasis
    mine) calls the "possibility that Fagan did not maintain or even
    increase that greater speed throughout the lane change" "counter-
    intuitive." As if to drive that idea home, the majority (again
    emphasis mine) notes that the video "shows that Fagan's car was
    clearly going visibly faster than the tractor-trailer just before
    it began the lane change." I get that Fagan went faster than the
    trucker before the switch-back started (you'll get no argument
    from me on that). But I see nothing in the record showing that
    the trucker couldn't have sped up as Fagan crossed the dashed-lane
    lines.   The majority also says that if the tractor-trailer had
    accelerated "when its driver saw Fagan in its lane," then "Fagan
    would still have been three to four car lengths ahead when Darcy
    got beside the tractor-trailer" — but, insists the majority, "the
    video plainly shows" that that did not happen. Yet Darcy himself
    agreed that when he got into the center lane with the truck in the
    immediate right lane, his dashcam "video" "show[ed]" Fagan "three
    or four car lengths in front of the tractor trailer." That the
    video (as the majority notes as well) then "shows Fagan moving
    away and quickly leaving enough space for Darcy's cruiser to pass
    in front of tractor-trailer" does not change my thinking either.
    Maybe Fagan sped up after Darcy spotted him 3 to 4 car lengths
    ahead of the trucker — or maybe (to continue operating in the
    majority's zone of speculation) the trucker (with a statie now
    coming up on his side) eased off the gas.
    - 43 -
    beginning to end.       The majority calls that "the relevant" period.
    But what mattered to the judge (understandably, in my view) was
    the "actual separation distance" once Fagan "returned" to the slow
    lane "after passing the tractor-trailer."                On that score, the
    uncontestedly safe distance of 3 to 4 car lengths came from Darcy's
    testimony on how far ahead of the truck Fagan was "roughly a
    second" after the switch-back.           And using 1 second rather than 5
    seconds (i.e., keying in on the 1 second period between when Fagan
    completed the merge and when Darcy saw Fagan 3 to 4 car lengths in
    front of the trucker), but still keeping the 5-miles-per-hour
    assumption, gives us this:
    5 𝑚𝑖𝑙𝑒𝑠 5280 𝑓𝑒𝑒𝑡       ℎ𝑜𝑢𝑟
    ×          ×              × 1 𝑠𝑒𝑐𝑜𝑛𝑑 = 7.33 𝑓𝑒𝑒𝑡 𝑐𝑙𝑜𝑠𝑒𝑟
    ℎ𝑜𝑢𝑟     𝑚𝑖𝑙𝑒      3600 𝑠𝑒𝑐𝑜𝑛𝑑𝑠
    That would put Fagan 7 feet closer to the trucker by the time he
    (Fagan) completed the switch-back, leaving 38 to 53 feet (45 to 60
    feet minus 7) between the two14 — a distance not even the government
    says is unsafe.
    The    bottom    line   is   that    accepting    the    majority's
    evidence-free     36-feet-closer      theory    (inspired    in   part     by   the
    government) moves us far beyond reasonable inference and into the
    14That is a pretty big gap too. It is a more than one but
    less than two average-sized telephone poles laid on the ground.
    (A typical telephone pole is about 30 feet high.       See Rich
    Vishneski, Telephone Poles — The More You Know!, DL Howell (Jan.
    24, 2020), https://www.dlhowell.com/blog/telephone-poles (last
    visited June 8, 2023).)
    - 44 -
    forbidden realm of speculative imaginings.              See generally Ornelas
    v. United States, 
    517 U.S. 690
    , 699 (1996) (holding that we must
    "give     due    weight   to    inferences"    from   the   "facts"   of   record
    (emphasis added)).15           Maybe that is why the judge did not rely on
    any must-have-been-even-closer theory in reaching his decision
    (even though the government pushed that idea (or a variation of
    it) below).16
    2
    Hyping the judge's comment that the video "appears" to
    show an "abrupt" lane change, the government also reminds us that
    a factfinder's choice among supportable views of the evidence
    cannot be clearly erroneous — the government seems to be suggesting
    that "abrupt" equals "unsafe" (the majority apparently agrees).
    It should go without saying (though I will say it nonetheless)
    15 All that speculation shows just how wrong the majority is
    to claim that "[t]he video bears twice on the issue of the speed
    deferential." The majority's claim is also out of place given how
    the judge (emphases mine) twice found the video "not definitive
    one way or the other" on the separation-distance issue — a finding
    the majority says is "not . . . clearly erroneous."
    16The majority is right that courts must "respect . . . the
    ability of trained and experienced police officers to draw from
    the attendant circumstances inferences that would 'elude an
    untrained person.'" United States v. Tiru-Plaza, 
    766 F.3d 111
    ,
    116 (1st Cir. 2014) (footnote omitted and quoting United States v.
    Cortez, 
    499 U.S. 411
    , 418 (1981)). But courts value inferences
    drawn from the hard "facts," see 
    id. at 117
     (emphasis added and
    quoting Terry, 
    392 U.S. at 27
    ) — not (as we have here) speculative
    suppositions on important issues (like the vehicles' relative
    speeds).
    - 45 -
    that abrupt cannot always equal unsafe (think of an abrupt change
    with no cars in the return lane).       Anyway the key word here is
    supportable — i.e., "anchored in probative evidence" on complete-
    record review.   See McGuire, 
    260 F.3d at 45
     (emphasis added).
    Darcy's reasonable-suspicion claim stands — or more accurately
    falls (as I've been saying) — on the notion that Fagan cut off the
    truck in a near-crash event.     But no one — not Darcy, not the
    judge, not the government, not this panel — knows the actual
    separation distance between Fagan's car and the truck or saw the
    truck's brake lights go on (I know I sound like a broken record,
    though necessarily so).    See 
    id. at 45-46
     (stamping a finding
    implausible after whole-record review, thus making the finding
    clearly erroneous).
    3
    Still hoping to rebut Fagan's points that Darcy could
    not see in front of the truck and did not know the distance between
    the vehicles, the government says none of that matters.      To the
    government's way of thinking (though not the majority's as far as
    I can tell), "[t]he existence . . . of some possibility" that Fagan
    violated no traffic law "does not nullify an officer's reasonable
    suspicion."   That is so — and here's the important part for its
    theory — because an officer "need not rule out the possibility of
    innocent conduct" to have reasonable suspicion (the quote comes
    from Arvizu, 
    534 U.S. at 277
    ).   While deeply-rooted, the "need not
    - 46 -
    rule out" rule does not help the government in the least.           An
    officer, after all, need not draw nonsuspicious inferences if
    sufficient   facts   establish   reasonable   suspicion.   See,   e.g.,
    Arvizu, 
    534 U.S. at 277-78
    .      So (once more) to get anywhere the
    government had to show that Darcy had an objective basis for
    reasonably suspecting that Fagan made an unsafe lane change.       And
    (once more again) Darcy's concessions — his inability to fix the
    distance between Fagan and the truck or Fagan's speed (after Fagan
    switched back to the slow lane), and his not glimpsing (at that
    key period) the trucker brake or drive defensively — put that
    objective out of reach.
    4
    In something of a final push, the government — citing to
    a Maine high court opinion mentioned by the majority, Pooler v.
    Clifford, 
    639 A.2d 1061
     (Me. 1994) — writes that Fagan's tardy
    turn signal should factor into a court's reasonable-suspicion
    analysis:    Pooler interpreted Maine law as saying that sometimes
    a signal may be needed for safety reasons, sometimes not (the
    majority seems to embrace the government's argument, by the way).
    See id. at 1062.     But
    it is not enough . . . for the district court
    to base its factual findings on some evidence
    in the record.     The clear error standard
    authorizes us to reverse a finding, not
    unless, but "'although there is evidence to
    support it.'"
    - 47 -
    Latif v. Obama, 
    666 F.3d 746
    , 766 (D.C. Cir. 2011) (Henderson, J.,
    concurring) (quoting Anderson, 
    470 U.S. at 573
    , in turn quoting
    U.S.   Gypsum     Co.,    
    333 U.S. at 395
    )   (emphases   added   by   Judge
    Henderson).      See generally Easley v. Cromartie, 
    532 U.S. 234
    , 257
    (2001) (finding clear error even though "the record contains a
    modicum of evidence offering support for the District Court's
    conclusion" that a state legislature used race as the predominate
    factor    in    drawing     a   congressional              district,   because      "[t]he
    evidence,      taken     together,     .    .       .   does   not   show   that    racial
    considerations predominated" (emphases added)).                             That crucial
    detail aside, Darcy (as the majority notes) offered two grounds
    for the pull over — the late signal and the cutting off of the
    truck in an almost-crash way.                   And a fair reading of the judge's
    order is that he pinned his reasonable-suspicion analysis on the
    second ground — a ground that is not "permissible" or "plausible"
    on complete-record review.             See Anderson, 
    470 U.S. at 574
    .                True,
    we may affirm a suppression order on any basis supported by the
    record.     See United States v. McGregor, 
    650 F.3d 813
    , 824 (1st
    Cir. 2011).      But the government offers no convincing reason to use
    Fagan's delayed signal in that way (indeed the government's brief
    does not even mention the affirm-on-any-ground rule).
    5
    The majority ends its reasonable-suspicion section by
    criticizing my focus on "Darcy's characterization of the lane
    - 48 -
    change as cutting off the tractor-trailer at so close a distance
    as to create an 'almost-crash situation.'"          Darcy's account —
    credited below, as the majority notes — shaped the judge's unsafe-
    lane-change finding from start to finish.        That account — which
    unquestionably alleged a near-crash scenario — made separation
    distance a major concern (as the judge said).           But (for the
    umpteenth time) neither he nor the judge could calculate that
    number.   And the majority's unfounded speculation — unfounded
    because no knows the actual separation distance, or for that matter
    the drivers' relative speeds — certainly cannot fill the hole (as
    I've also been at pains to say).       Which seems like a topic worthy
    of focus, given how reasonable suspicion requires us to consider
    "the whole picture," see Cortez, 
    449 U.S. at 417
    , so we do not
    miss the larger situation.
    V
    All in all, the majority's position (based largely on
    the government's) is too long on guesses and too short on facts to
    sustain the judge's conclusion that a reasonable trooper in Darcy's
    shoes would have suspected that he had seen an unsafe lane change.
    So I would reverse the denial of Fagan's suppression motion, vacate
    his conviction and sentence, and remand for further proceedings.17
    17Given my take on the stop issue, I need not (and so do not)
    discuss any of Fagan's other grounds for reversal — including
    claims that officers unlawfully prolonged the traffic stop and
    violated his Miranda rights, and that the judge wrongly denied
    - 49 -
    And I must respectfully — but emphatically — dissent
    from the majority's contrary holding.
    some of his racial profiling-related discovery requests. See PDK
    Lab'ys Inc. v. U.S. D.E.A., 
    362 F.3d 786
    , 799 (D.C. Cir. 2004)
    (Roberts, J., concurring in part and concurring in the judgment)
    (declaring that "if it is not necessary to decide more, it is
    necessary not to decide more").
    - 50 -