Duval v. United States Department of Veterans Affairs ( 2023 )


Menu:
  •           United States Court of Appeals
    For the First Circuit
    No. 21-1650
    DENISE DUVAL, Administrator of the Estate of Wilfred Duval,
    Plaintiff, Appellant,
    v.
    UNITED STATES DEPARTMENT OF VETERANS AFFAIRS,
    Defendant, Appellee.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Leo T. Sorokin, U.S. District Judge]
    Before
    Kayatta, Howard, and Thompson,
    Circuit Judges.
    Traver Clinton Smith, Jr., with whom Law Offices of Traver
    Clinton Smith, Jr., was on brief, for appellant.
    Michael L. Fitzgerald, Assistant United States Attorney, with
    whom Rachael S. Rollins, United States Attorney, and Eve A.
    Piemonte, Assistant United States Attorney, were on brief, for
    appellee.
    June 1, 2023
    HOWARD,   Circuit      Judge.        Denise     Duval,   as   the
    administrator of her father's estate, urges us to conclude that
    the district court abused its discretion by declining to strike
    expert witness testimony at a bench trial, testimony that she
    contends   fell   outside   the    scope   of     an     expert's   pretrial
    disclosures.   She consequently asks that we vacate the judgment of
    the district court in favor of the government and remand for a new
    trial. Finding that any ostensible error committed by the district
    court was harmless, we affirm the judgment.
    I.
    In this case, our review follows a bench trial, and so
    "[o]ur recitation of the facts is drawn from the [d]istrict
    [c]ourt's findings of fact and conclusions of law." Emhart Indus.,
    Inc. v. U.S. Dep't of the Air Force, 
    988 F.3d 511
    , 515 n.1 (1st
    Cir. 2021); see Duval v. United States, No. 18-10405, 
    2021 WL 5701770
     (D. Mass. July 20, 2021) (district court opinion).               Our
    focus is trained principally on the portions of the record most
    relevant to Duval's argument on appeal that the government violated
    expert discovery rules by introducing an allegedly previously
    undisclosed theory on the fifth day of trial -- namely, that a
    suture used by medical providers on her father migrated from its
    intended location.
    - 2 -
    A.
    This appeal arises from a medical malpractice action
    that Duval brought against the U.S. Department of Veterans Affairs
    under the Federal Tort Claims Act ("FTCA"), 
    28 U.S.C. §§ 1346
    (b),
    2671-2680.     Duval alleged that providers at the West Roxbury
    Veterans Affairs Medical Center ("VA") negligently performed a
    percutaneous coronary intervention ("PCI") on her father, Wilfred
    Duval, in March 2015.       Wilfred Duval died just under a year after
    the   operation;      his   daughter    brought         this        action   as   the
    administrator of his estate.
    Wilfred    Duval,    then       an    84-year-old          resident     of
    Claremont, New Hampshire, was hospitalized in February 2015 after
    suffering     a    heart     attack.             He     was     diagnosed         with
    "severe . . . coronary        artery        disease"        after       a    cardiac
    catheterization procedure and was then transferred to the VA for
    further     evaluations.        Because      of       his     age     and    multiple
    comorbidities, medical providers at the VA recommended -- and
    Wilfred Duval agreed to -- the following two-step process to treat
    his coronary artery disease: first, a "minimally invasive direct
    coronary artery bypass" procedure ("MIDCAB"), and then a PCI.                      The
    MIDCAB procedure was completed without complications and is not at
    issue in this appeal.
    Dr. Ioannis Chatzizisis and Dr. Sammy Elmariah performed
    the PCI approximately a week after the MIDCAB.                      As the district
    - 3 -
    court explained, "[a] PCI is a procedure used to reestablish normal
    blood flow to the heart.          The procedure involved inserting a
    catheter into Mr. Duval's right femoral artery[,] . . . guiding
    the catheter towards the heart, and deploying a stent in Mr.
    Duval's left main coronary artery."           Both parties agree that the
    providers successfully deployed the stent.          Instead, the crux of
    Duval's medical malpractice claim stems from the providers' use of
    a Perclose Proglide device to suture the hole through which they
    inserted the catheter for the procedure.              The district court
    credited Dr. Elmariah's testimony that he and Dr. Chatzizisis
    followed "the proper steps for deployment of the device."            Indeed,
    the district court noted that the providers found no external
    bleeding around the site of the insertion point -- the presence of
    which could have indicated improper deployment of the suture --
    and Wilfred Duval more generally "appeared stable at the end of
    the procedure."
    However, Wilfred Duval's blood pressure subsequently
    dropped to "concerning[,] if not dangerous[,]" levels in the hours
    following the completion of the PCI, and a computerized tomography
    ("CT") scan later indicated retroperitoneal bleeding -- namely,
    "internal bleeding from the site at which the doctors had entered
    Mr.   Duval's   artery   with   [a]    needle."    Dr.   Naren   Gupta   then
    performed emergency surgery on Wilfred Duval -- having received
    his daughter's consent for        the operation      -- and      located the
    - 4 -
    Perclose suture not at the hole through which the catheter was
    originally     inserted,    but   rather       in   Wilfred   Duval's    external
    oblique muscle.1      The surgery successfully stopped the bleeding
    and "saved Mr. Duval's life."
    Wilfred Duval remained at the VA for nearly three months
    after the surgery to receive continual care and was discharged to
    Whittier Rehabilitation Hospital in late May 2015.                  Duval and the
    government dispute whether her father's condition improved over
    the   course   of   the    following    months;      nevertheless,      his   lower
    extremity vascular disease -- a condition from which he suffered
    even prior to the heart attack -- had worsened by October and led
    to another hospitalization at the VA.                Duval testified that her
    father's condition steadily worsened thereafter, and he passed
    away in February 2016 "from septic shock due to pneumonia and
    chronic respiratory failure."           Duval claimed that the "improper
    deployment     of   the    Perclose    device       constitute[d]    malpractice
    because [the] incorrect placement of the Perclose suture led to
    1 There is some confusion as to whether Dr. Gupta found the
    device in Wilfred Duval's oblique or rectus muscle. Dr. Gupta's
    discharge notes stated that he "saw the Perclose device in the
    rectus muscle," but he later clarified during his trial testimony
    that this was an error and he had actually found the device in the
    external oblique muscle. The relevant portion of Dr. Weinstein's
    (the government's expert) report accorded with the discharge
    notes' recitation of the facts, as did the district court's
    opinion, and we accordingly opt not to alter references to the
    rectus or abdominal muscle, since this point is far from
    dispositive in this appeal.
    - 5 -
    Mr. Duval's retroperitoneal bleed as well as other complications
    that ultimately caused his death."
    B.
    Duval filed this FTCA action in March 2018, seeking
    $6,000,000 in damages.         The parties submitted dueling expert
    witness reports that in part addressed the question of whether the
    doctors deviated from the applicable standard of care in deploying
    the Perclose device.       Most relevantly to this appeal, Dr. Joseph
    Weinstein -- the government's expert -- opined that "the failure
    of the [Perclose] device to deploy was not a deviation in the
    standard of care for the average qualified cardiologist in 2015.
    The fact that the device was found in the rectus [muscle] by Dr.
    Gupta does NOT denote that there was a deviation from the standard
    of care."   Dr. Weinstein's report also noted that Perclose devices
    have a "failure rate of 7%[,]" which more or less accorded with
    trial testimony both from Dr. Elmariah and from Duval's expert,
    Dr. Tobia Mercuro.         Indeed, Dr.     Elmariah testified that the
    "failure    rate   is   higher . . . for    arteries   such   as   [Wilfred
    Duval's], where there's a lot of calcium."        Neither party deposed
    the other's expert witness before trial, despite being entitled to
    do so by Rule 26.       See Fed. R. Civ. P. 26(b)(4)(A).
    As noted, the district court held a six-day bench trial,
    during which the district judge heard testimony from ten witnesses
    and admitted over two dozen exhibits.        The question of whether the
    - 6 -
    suture could migrate from its original location surfaced several
    times during the proceedings.   First, the government indicated to
    the district court during its opening statement that the court
    would "hear that . . . the fact that the suture was found in the
    abdominal muscle does not mean that it was initially deployed
    there."   Later that day, government counsel asked Duval's expert,
    Dr. Mercuro, on cross-examination whether he knew where Drs.
    Elmariah and Chatzizisis had deployed the suture, to which Dr.
    Mercuro responded that "if it[] [was] found sutured in the rectus
    muscle, that's where it had to be initially deployed."     Government
    counsel then asked Dr. Mercuro if his opinion was "that it cannot
    be the case [that] a suture is deployed in one area, and then
    subsequently dislodged," to which Dr. Mercuro responded that "the
    suture will not migrate."    Most significantly, the government's
    expert, Dr. Weinstein, and government counsel had the following
    colloquy on the fifth day of trial concerning Dr. Gupta's having
    found the suture away from the femoral artery:
    Q. How, if at all, does [Dr. Gupta's finding]
    indicate how the Perclose was deployed?
    A. So it doesn't indicate how the Perclose was
    deployed.    All it indicates is that the
    device, at some point, migrated from the
    femoral artery to the place where it was found
    at the time of surgery, which was, again,
    approximately six hours later.
    Q. And how can a Perclose device migrate?
    - 7 -
    A. A Perclose device can migrate for several
    reasons.   One, it could have been deployed
    appropriately, and then migrated as a result
    of the fact that the vessels that it was
    deployed in were severely dozed [sic].     It
    could have been deployed [sic] due to patient
    movement or being not secured appropriately.
    It could have been deployed and then moved
    because of the fact that the patient
    subsequently did have another angiogram, and
    a balloon was placed into the femoral artery
    to stop bleeding.
    Duval urged the district court to strike this testimony on three
    occasions.   She first asked the district court to do so shortly
    after the colloquy above "on the premise that [Dr. Weinstein was
    testifying to] possibilities, but he's not testifying to facts,"
    but the district court denied this motion.           She again moved to
    strike this portion of Dr. Weinstein's testimony later that day,
    arguing   both   that   "it   was   pure    speculation,"   and   --   most
    importantly for the purposes of this appeal -- that she "had no
    warning" and "never knew [Dr. Weinstein] was going to testify [to]
    that . . . [because] [i]t wasn't disclosed."         The district court
    denied this motion without prejudice.          Finally, in her proposed
    findings of fact and conclusions of law, Duval included a passage
    striking the relevant testimony.
    C.
    The district court ultimately found in the government's
    favor on Duval's claims because it concluded "that there was no
    malpractice."    Applying Massachusetts medical malpractice law --
    - 8 -
    as is mandated by the FTCA, see 
    28 U.S.C. § 1346
    (b)(1) -- the court
    concluded   that     Dr.    Elmariah      "was     skilled,       experienced,          and
    meticulous[,] and that he appropriately supervised Dr. Chatzizisis
    during the PCI and in the deployment of the Perclose device."2                          See
    Parr v. Rosenthal, 
    475 Mass. 368
    , 376 (2016) ("To state a claim
    for medical malpractice, a plaintiff must demonstrate [in part]
    that . . . the defendant physician was negligent, which in medical
    malpractice cases means that the physician committed a breach of
    the 'standard of care and skill of the average member of the
    profession' practicing in his or her specialty." (quoting Bradford
    v. Baystate Med. Ctr., 
    415 Mass. 202
    , 206 (1993))). While "[t]here
    is no doubt that the suture did not successfully and permanently
    seal the hole in Mr. Duval's artery," the district court noted
    that -- as discussed in Dr. Weinstein's expert disclosures -- "the
    Perclose device has a known failure rate . . . [and] Dr. Elmariah
    testified that the failure rate is higher for arteries with
    substantial    calcium       deposits,     such     as    Mr.    Duval's     artery."
    Ultimately,    the     court      concluded      that    Duval     did     not        prove
    malpractice with regard to the deployment of the Perclose device
    by   a   preponderance       of    the    evidence       because    "the     evidence
    demonstrates    that       the    technique      employed       (selection       of    the
    2   The district court also rejected Duval's argument that
    delays in diagnosing the retroperitoneal bleed in the aftermath of
    the PCI deviated from the standard of care, but this aspect of the
    court's opinion is not at issue on appeal.
    - 9 -
    Perclose device) met the standard of care and that the physicians
    complied with the standard of care in their implementation of the
    technique (the deployment of the Perclose device)."             As further
    discussed below, the court also addressed the suture-migration
    issue in a footnote to its opinion but did not purport to resolve
    the dispute over the legitimacy of the theory.3
    Having found that Duval failed to prove a breach of the
    standard of care, the district court entered judgment in favor of
    the government.       This appeal followed.
    II.
    As noted, the sole challenge Duval advances on appeal
    concerns the admission of Dr. Weinstein's challenged testimony in
    the   context    of    the    government's   expert   witness   disclosure
    obligations. We review the admission of expert testimony for abuse
    of discretion.    Gay v. Stonebridge Life Ins. Co., 
    660 F.3d 58
    , 61
    (1st Cir. 2011).       "Pursuant to that standard, 'embedded findings
    of fact are reviewed for clear error, questions of law are reviewed
    de novo, and judgment calls are subjected to classic abuse-of-
    discretion review.'"         Martínez v. United States, 
    33 F.4th 20
    , 27
    3 The court also stated in its opinion that "[n]either party
    objected to expert testimony on this matter as beyond the scope of
    the expert reports." This observation appears to be inconsistent
    with Duval's second motion to strike and her proposed findings.
    But Duval does not advance any argument in her briefs on appeal
    that the district court erred in making the statement, and has
    therefore waived any argument to that effect.
    - 10 -
    (1st Cir. 2022) (quoting Lawes v. CSA Architects & Eng'rs LLP, 
    963 F.3d 72
    , 90 (1st Cir. 2020)).
    But our inquiry does not end there.      Even "[i]f we
    determine that the testimony was erroneously admitted, we [still]
    then review that admission for harmless error."   Gay, 
    660 F.3d at 62
    .   "Our harmlessness inquiry is whether . . . [the] admission of
    the evidence affected plaintiff's substantial rights.    The central
    question is whether this court can say with fair assurance that
    the judgment was not substantially swayed by the error."    Dusel v.
    Factory Mut. Ins. Co., 
    52 F.4th 495
    , 512 (1st Cir. 2022) (ellipsis
    in original) (quoting Gay, 
    660 F.3d at 62
    ); see also Fed. R. Civ.
    P. 61 ("Unless justice requires otherwise, no error in admitting
    or excluding evidence -- or any other error by the court or a party
    -- is ground for granting a new trial . . . . At every stage of
    the proceeding, the court must disregard all errors and defects
    that do not affect any party's substantial rights.").4
    4  Duval at least partly predicates her arguments against
    harmlessness on Rule 37(c)(1)'s instruction to district courts
    that "[i]f a party fails to provide information or identify a
    witness as required by Rule 26(a) or (e), the party is not allowed
    to use that information or witness to supply evidence on a motion,
    at a hearing, or at a trial, unless the failure was substantially
    justified or is harmless."     The government contends that Rule
    37(c)(1) is "inapposite" because "the district court found no
    violation of Rule 26(a), and therefore had no occasion to consider
    sanctions under Rule 37."
    The government has the better of the argument.    Our cases
    suggest that the standard prescribed in Gay controls in appeals
    like Duval's of alleged abuses of discretion in admitting expert
    testimony.   This standard originates from Kotteakos v. United
    - 11 -
    III.
    A.
    "Recognizing     the   importance   of   expert    testimony   in
    modern trial practice, [Rule 26] provide[s] for extensive pretrial
    disclosure   of   expert   testimony."        Lawes,   963   F.3d   at   90
    (alterations in original) (quoting Thibeault v. Square D Co., 
    960 F.2d 239
    , 244 (1st Cir. 1992)).      "Plaintiffs and defendants alike
    must identify their expert witnesses and produce their experts'
    States, 
    328 U.S. 750
    , 765 (1946) ("But if one cannot say, with
    fair assurance, after pondering all that happened without
    stripping the erroneous action from the whole, that the judgment
    was not substantially swayed by the error, it is impossible to
    conclude that substantial rights were not affected." (emphasis
    added)), and is rooted in the Federal Rules of Civil and Criminal
    Procedures' harmless-error provisions, 
    id.
     at 757 n.9.           By
    contrast, the factors we incorporate into our review of a district
    court's decision to order preclusion under Rules 26 and 37 differ
    from the standard prescribed in Gay. See, e.g., Martínez, 33 F.4th
    at 34 (noting that factors we assess in reviewing a district
    court's decision to order total preclusion of an expert's testimony
    based on failure to comply with discovery obligations include "(1)
    the history of the litigation; (2) the sanctioned party's need for
    the precluded evidence; (3) the sanctioned party's justification
    (or lack of one) for its late disclosure; (4) the opponent-party's
    ability    to    overcome    the    late    disclosure's    adverse
    effects[;] . . . and (5) the late disclosure's impact on the
    district court's docket" (quoting Esposito v. Home Depot U.S.A.,
    Inc., 
    590 F.3d 72
    , 78 (1st Cir. 2009))); Lawes, 963 F.3d at 92
    ("As to [appellant's] quarrel with the district court's sanction
    [of preclusion], the question 'is not whether we would have imposed
    the same sanction. Rather, the question is whether the district
    court's action was so wide of the mark as to constitute an abuse
    of discretion.'" (quoting Macaulay v. Anas, 
    321 F.3d 45
    , 51 (1st
    Cir. 2003))). We nevertheless note that at least the D.C. Circuit
    has incorporated harmlessness under both Rule 37 and Rule 61 into
    its analysis in a similar scenario. See, e.g., Muldrow ex rel.
    Estate of Muldrow v. Re-Direct, Inc., 
    493 F.3d 160
    , 167-68 (D.C.
    Cir. 2007).
    - 12 -
    reports by court-approved deadlines."                
    Id.
     (citing Fed. R. Civ. P.
    26(a)(2)(A)-(B)).              Most    relevant      to   this    appeal     is    Rule
    26(a)(2)(B)(i), which requires expert witness reports to include
    "a complete statement of all opinions the witness will express and
    the basis and reasons for them."
    As noted above, Duval contends that Dr. Weinstein's
    report     ran    afoul   of    the    "complete     statement"     requirement     by
    omitting the migration theory that surfaced at trial.                       She points
    us to the district court's statement in its opinion that "[n]either
    expert report discussed whether a Perclose suture can migrate post-
    deployment" as evidence for this proposition.                    More specifically,
    she argues that Dr. Weinstein's statement in his report that "the
    failure of the device to deploy was not a deviation in the standard
    of care for the average qualified cardiologist in 2015" could not
    have alerted her to the theory that the suture had migrated post-
    deployment, as subsequently discussed at trial.                   For its part, the
    government        counters      with    the     subsequent       sentence     in    Dr.
    Weinstein's opinion, which read, "[t]he fact that the device was
    found in the rectus sheath by Dr. Gupta does NOT imply that there
    was a deviation from the standard of care."                Citing to our decision
    in   Gay    for    the    proposition         that   experts     are    entitled     to
    "reasonabl[y] elaborat[e]" on previously disclosed opinions at
    trial, 
    660 F.3d at 64
    , the government argues that Dr. Weinstein's
    migration-focused         testimony      merely      constituted       "a   reasonable
    - 13 -
    explanation of his opinion that the location of the suture did not
    imply negligence in its deployment."
    B.
    Despite the parties' ample briefing on the subject, this
    dispute need not detain us.        We ultimately conclude that, even
    assuming that Duval is correct in her contention that the district
    court   erred   in    admitting   Dr.    Weinstein's   migration-focused
    testimony, any error was harmless.         As noted above, the focus of
    our harmlessness inquiry at this juncture is to ensure ourselves
    that "the judgment was not substantially swayed by the error."
    Gay, 
    660 F.3d at 62
     (quoting Rubert–Torres v. Hosp. San Pablo,
    Inc., 
    205 F.3d 472
    , 480 (1st Cir. 2000)).       This review is meant to
    provide "a check upon arbitrary action and essential unfairness in
    trials," and not a "multiplicity of loopholes which any highly
    rigid and minutely detailed scheme of errors . . . will engender
    and reflect in a printed record."        Kotteakos, 
    328 U.S. at 760
    ; see
    also Shinseki v. Sanders, 
    556 U.S. 396
    , 407 (2009) ("We have
    previously warned against courts' determining whether an error is
    harmless through the use of mandatory presumptions and rigid rules
    rather than case-specific application of judgment, based upon
    examination of the record.").
    Here, we are unconvinced that any ostensible error in
    admitting Dr. Weinstein's testimony "substantially swayed" the
    judgment below.      Duval contends that "[t]he Government offered no
    - 14 -
    other expert testimony on negligence than the 'migration' theory,
    and therefore offered no negligence defense other than [that]
    theory."   But, as noted above, our harmlessness inquiry focuses on
    the district court's reasoning, and we do not have any indication
    that the court relied on Dr. Weinstein's challenged testimony in
    a way that would fundamentally call its bottom-line conclusion
    (i.e., that Drs. Elmariah and Chatzizisis did not breach the
    standard of care) into question.       Cf. Dusel, 52 F.4th at 512 ("In
    this case, we can say with such assurance that neither the district
    court's judgment nor our de novo review was affected by any alleged
    error as neither court relied on the evidence that [appellant]
    disputes.").
    To be sure, Duval's case is distinguishable from Dusel,
    a case in which the challenged evidence was duplicative of other
    materials in the record, and in any case "neither the district
    court's holding nor our . . . review relie[d] on" it.          Id.   Here,
    by contrast, the district court stated that it "considered" Dr.
    Weinstein's    testimony   "that    sutures   can   migrate   in   certain
    conditions . . . in determining Dr. Elmariah's credibility, as
    well as in determining whether proper procedure was followed by
    Dr. Elmariah and Dr. Chatzizisis in deploying the Perclose device."
    But the district court similarly stated that it considered the
    testimony of Duval's expert that a suture will not migrate once
    deployed as well.    And, as the government stresses, the district
    - 15 -
    court apparently found no need to resolve that disagreement.
    Rather, it focused on the device's failure rate even when properly
    used -- noting testimony that "the failure rate is higher for
    arteries with substantial calcium deposits, such as Mr. Duval's
    artery" -- and highlighted evidence that the device was properly
    used in this case, such as the facts that "Mr. Duval did not
    display external bleeding after the doctors used the Perclose
    device and the doctors did not observe any puffiness or swelling
    around his groin area, both of which would have been indicators
    that the Perclose device did not correctly deploy."                   On this
    record,   we   cannot   conclude   that     any    error   in   admitting    Dr.
    Weinstein's testimony "substantially swayed" the district court's
    judgment.      Cf. Gay, 
    660 F.3d at 64
     (reasoning that admitting
    testimony that allegedly was beyond the scope of an expert report
    was   harmless   when   that   "testimony    [could     not]    reasonably    be
    understood as the pivotal evidence that tipped the verdict in favor
    of [appellee]").
    Duval responds that the district court could not have
    concluded that the doctors complied with the standard of care
    without also concluding that the suture migrated, given that the
    suture was found in the rectus muscle.            Duval thus infers that the
    district court did in fact conclude that the suture migrated, even
    though the court did not explicitly resolve that matter.
    - 16 -
    But this inferential reading of the court's opinion
    could apply just as well to the expert disclosure made by the
    government.        In acknowledging where the device was found while
    expressly rejecting any claim that that fact meant                              that the
    attempted deployment was negligent, the expert disclosure itself
    -- if read in the same way Duval reads the court's opinion --
    implied that migration must be possible.                    All that is to say that
    if   we   read     the   district   court       as    implicitly        accepting     that
    migration    was     possible,      then    we       should      similarly     read    the
    government's       expert    disclosure.             So    Duval's      only   developed
    rejoinder     to     the    government's         harmlessness           argument      would
    undermine her argument that she was unfairly surprised by the
    migration theory at trial.5             This -- paired with the fact that
    plaintiff's counsel expressed no surprise when government counsel
    mentioned    migration       in   opening,       or       even   when    the   migration
    testimony    was     first    offered      --    further         supports      our    above
    5 To be clear, to the extent that Duval meant to use the
    relevant portion of her brief as an argument that the court erred
    under Massachusetts law in concluding that the doctors' deployment
    of the Perclose device did not deviate from the standard of care,
    we deem any such argument waived for lack of development.       Cf.
    United States v. Zannino, 
    895 F.2d 1
    , 17 (1st Cir. 1990) ("[I]ssues
    adverted to in a perfunctory manner, unaccompanied by some effort
    at developed argumentation, are deemed waived."). Duval did not
    cite to a single case in support of this proposition in the
    relevant section of her brief. See United States v. Freitas, 
    904 F.3d 11
    , 21 (1st Cir. 2018) (applying Zannino waiver to an argument
    for which appellant "neither cite[d] any precedent nor explain[ed]
    the lack of precedent").
    - 17 -
    conclusion that any error by the district court in allowing the
    testimony did not "substantially sway" the trial's outcome.
    IV.
    Duval raises the concern that a ruling adverse to her
    might encourage misbehavior by litigants in the future.                 On the
    contrary, our decision in this case in no way should be read to
    condone   Rule     26   violations;    the     rule's   requirements   are   "an
    integral part of the machinery devised to facilitate the management
    of pretrial discovery."       Lawes, 963 F.3d at 90 (quoting Downey v.
    Bob's Disc. Furniture Holdings, Inc., 
    633 F.3d 1
    , 5 (1st Cir.
    2011)).     But, given our harmlessness analysis, we nevertheless
    cannot say on the record before us that the alleged error in
    admitting    Dr.    Weinstein's       testimony    warrants    upsetting     the
    district court's considered judgment. The judgment of the district
    court is thus affirmed.
    - 18 -