Lestage v. Coloplast Corp. ( 2020 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 19-2037
    AMY LESTAGE,
    Plaintiff, Appellee,
    and
    UNITED STATES AND THE STATE OF CALIFORNIA, ex rel., KIMBERLY
    HERMAN, AMY LESTAGE AND KEVIN ROSEFF,
    Plaintiffs,
    v.
    COLOPLAST CORP.,
    Defendant, Appellant,
    and
    COLOPLAST A/S; CONVATEC, INC.; HOLLISTER, INC.; 180 MEDICAL,
    INC.; A-MED HEALTH CARE, INC.; BYRAM MEDICAL SUPPLIES, INC.; CCS
    MEDICAL SUPPLIES, INC.; LIBERTY MEDICAL SUPPLIES, INC.;
    LIBERATOR MEDICAL SUPPLY, INC.; SHIELD MEDICAL, INC.; UROMED,
    INC.; RGH ENTERPRISES, INC.; SHIELD CALIFORNIA HEALTHCARE
    CENTER, INC.,
    Defendants.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Rya W. Zobel, U.S. District Judge]
    Before
    Lynch, Selya, and Lipez,
    Circuit Judges.
    Elisabeth S. Theodore, with whom Samuel F. Callahan and Arnold
    & Porter Kaye Scholer LLP were on brief, for appellant.
    Rachel M. Wertheimer, with whom Paul W. Shaw, Tawny L.
    Alvarez, and Verrill Dana, LLP were on brief, for appellee.
    December 9, 2020
    LYNCH,   Circuit    Judge.       This   case    under    the   anti-
    retaliation provision of the False Claims Act raises an issue of
    first impression in this circuit as to the proper causation
    standard.    
    31 U.S.C. § 3730
    (h)(1).        Amy Lestage filed suit against
    her employer Coloplast Corporation ("Coloplast") in 2016 alleging
    that Coloplast had retaliated against her in violation of the False
    Claims Act after it learned that she had filed a qui tam action
    against it and one of its largest customers.               Lestage was placed
    on indefinite administrative leave four days after that customer
    requested that Lestage stop serving its account. When she returned
    from leave after the qui tam suit against Coloplast was settled,
    Lestage     says   she   was   given   an    inferior      slate    of   account
    assignments.
    After a five-day trial, the jury concluded that both the
    leave and the account assignment were adverse employment actions
    taken because of Lestage's involvement in the qui tam suit and
    awarded Lestage $762,525 in compensatory damages.
    The district court denied Coloplast's subsequent motions
    for judgment as a matter of law and a new trial.              Fed. R. Civ. P.
    50, 59.      Coloplast appeals from the denials of these motions,
    challenging the sufficiency of the evidence to support the verdict,
    whether plaintiff's expert testimony as to damages was properly
    admitted, and whether the jury instructions, to which it had
    consented, were error.
    - 3 -
    We reject Coloplast's claims of error and affirm.            In
    doing so, we hold under Supreme Court precedent that the causation
    standard for retaliation claims under the False Claims Act is a
    "but-for" standard. We join the Third, Fourth, Fifth, and Eleventh
    Circuits in doing so.      See DiFiore v. CSL Behring, LLC, 
    879 F.3d 71
    , 73 (3d Cir. 2018); U.S. ex rel. Cody v. ManTech Int'l, Corp.,
    746 Fed. App'x 166, 176-77 (4th Cir. 2018) (unpublished opinion);
    U.S. ex rel. King v. Solvay Pharms., Inc., 
    871 F.3d 318
    , 333 (5th
    Cir. 2017); Nesbitt v. Candler Cnty., 
    945 F.3d 1355
    , 1359 (11th
    Cir. 2020).
    I. Factual Background
    In   reviewing    the   denial   of   Coloplast's   motion   for
    judgment as a matter of law, we examine all evidence in the light
    most favorable to the jury verdict.        See ITYX Sols. AG v. Kodak
    Alaris, Inc., 
    952 F.3d 1
    , 9 (1st Cir. 2020).
    Coloplast is a medical device company that develops
    ostomy, continence, wound, and skin care products.        Coloplast has
    between 12,000 and 16,000 sales accounts.        Just forty to fifty of
    these, called key accounts, provide over 95% of Coloplast's sales.
    Key accounts vary in size, but most have at least $1 million in
    sales per year or substantial growth potential.
    Key account managers ("KAMs") are responsible for making
    sales to and managing Coloplast's relationship with key accounts.
    KAMs receive a base salary and a bonus, but the bonus makes up a
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    large percentage of their compensation.             The bonus is based on the
    growth in sales in the accounts they manage.               If a KAM achieves
    his or her "target" growth in sales, the KAM receives 100% of a
    set commission ($80,000 in the relevant time period).                If growth
    exceeds the target, the KAM is paid more, and if growth falls short
    of   the     target,   the   KAM   is   paid    less.   Management   sets   the
    individualized growth targets each year.
    Lestage began working as a salesperson for Coloplast in
    2004.       In 2010, she became Coloplast's first key account manager.1
    In 2013 and 2014, she was the highest-performing KAM at Coloplast.
    Among her key accounts was Byram Health Care ("Byram"), which is
    one of Coloplast's largest accounts.             Byram made up approximately
    80% of her sales portfolio by volume.
    In December 2011, Lestage and others filed a qui tam
    action under the False Claims Act against Coloplast and several
    Coloplast competitors and clients, including Byram.              The qui tam
    complaint alleged that Coloplast had paid kickbacks to clients,
    including Byram.        The complaint was filed under seal as required
    by law.        See 
    31 U.S.C. § 3730
    (b)(2).          This meant that neither
    Coloplast nor Byram was notified of the suit during this period of
    sealing.       The US Department of Justice ("DOJ") investigated the
    allegations and ultimately decided to pursue them.             The complaint
    1 When Lestage was promoted in 2010, her job title was
    "distribution account manager," Coloplast's old term for KAMs.
    - 5 -
    was unsealed on August 21, 2014.            Near the end of November 2014,
    Lestage noticed that Byram had stopped replying to her emails and
    phone calls.
    On December 19, 2014, Byram's CEO sent an email to Edmond
    Veome, then Coloplast's Senior Vice President of the North America
    region, with an attached letter stating that Byram "no longer
    wish[ed] to work with Amy Lestage regarding our business together"
    and would like to be assigned to a new KAM.
    Veome asked Byram why it wished to remove Lestage from
    its account.        The Byram representative told Veome to contact
    Byram's attorneys with any questions.                 Veome reached out to
    Coloplast's in-house counsel as well as Thomas Beimers, the lawyer
    representing Coloplast with respect to the DOJ qui tam suit.
    Veome,    Beimers,       Nick    Pederson   (Coloplast's       human    resources
    director),    and    Mort      Hansen   (Lestage's   direct    supervisor)    met
    several   times     in   the    following   days.     The     content   of   those
    conversations was not disclosed under claims of attorney-client
    privilege.
    On December 23, 2014, Hansen and Pederson called Lestage
    and told her she was being placed on indefinite paid administrative
    leave.    Pederson sent a follow-up letter later that day which
    stated that "as a result of Byram's demand, we are placing you on
    an indefinite, paid administrative leave effective as of December
    23, 2014, while we investigate this matter further."                    Coloplast
    - 6 -
    did not ask her to continue managing her other key accounts with
    four other customers.      Coloplast presented no evidence that anyone
    at Coloplast performed any investigation during the period Lestage
    was placed on leave.
    During the administrative leave, Coloplast continued to
    pay Lestage her base salary, as well as 100% of her target
    incentive bonus.   Coloplast also gave her the standard annual 2.5%
    raise and allowed her to keep her company car and gas card.
    Coloplast cut her off from use of her Coloplast email account while
    she was on leave.      Coloplast presented no evidence that it had
    promptly notified her other key accounts that she had been placed
    on leave.
    Lestage was not asked to return until January 2016, after
    Coloplast had agreed to settle the qui tam action. Veome testified
    at trial that the decision to bring Lestage back to work was
    somewhat independent of the resolution of the qui tam action, but
    at his deposition he had stated that when the qui tam action was
    "moving toward resolution" was "the time to bring her back to work
    because there was no longer going to be the pending investigation.
    There was an outcome that was being delivered, and so it would be
    okay for her to return."
    In December 2014, when she was placed on leave, Lestage
    was managing five key accounts: ABC Home Medical ("ABC"), Byram,
    Home   Care   Delivered,    Claflin,   and   Buffalo   Hospital   Supply
    - 7 -
    ("Buffalo").     Upon her return, she was given the Claflin, Home
    Care Delivered, and Buffalo accounts along with four new accounts:
    Geriatric,     AmerisourceBergen,   Blackburn's,   and   Concordance.
    Lestage had asked not to be reassigned to the Byram account but
    told Coloplast she wanted the ABC account.     She was not assigned
    the ABC account at any time after her return, even when the person
    who handled the account during her leave left that job.
    While Lestage was on leave, the ABC account was managed
    by Henrik Wurgler, a non-KAM employee.     At the time of Lestage's
    return, ABC was in the process of selling its business.        Hansen
    gave as a reason why Lestage did not receive the ABC account that
    in July 2015, when ABC was told that Lestage would be returning
    from leave, ABC requested that Wurgler remain on the account
    because he had been "an outstanding supporter of ABC Medical and
    [was] always timely in his response, unlike his predecessor."2
    2    The parties dispute who ABC was referring to when it
    said "his predecessor." Lestage's direct supervisor, Mort Hansen,
    was managing the account right before Wurgler took over. But ABC's
    request was directed to Hansen, and the email was a discussion
    about whether Lestage should be returned to the account, suggesting
    that the email referred to Lestage.
    Lestage learned only upon returning to work that Coloplast
    had not initially told ABC about her leave. During her leave she
    received several emails from ABC to her work address, but she never
    saw them because she was cut off from her work email while on
    leave. Four months after her leave began, an ABC employee sent
    another email to her work address asking why she was not responding
    to ABC's emails. She saw this email about a year later when she
    returned to work.
    - 8 -
    Hansen also testified that Coloplast "had internal knowledge at
    the time [of the merger] at the management level that there's a
    high likelihood that [the account ABC merged with] was somehow
    financially tied to . . . one of the qui tam action accounts."3
    Wurgler left in early 2016 and Timothy Townson was
    assigned the ABC account, not Lestage.                Hansen testified that
    Townson       was    assigned   the   account   because   he   was   located   in
    California, where the ABC point-of-contact would be located after
    the merger.          The only explanation for why her location in New
    England was a barrier to her handling this account was testimony
    that Coloplast was trying to reduce costs and ease of travel for
    KAMs.       The account was transferred again to Yvonne Battistini, not
    to Lestage, in late 2018 or early 2019.
    Lestage also asked to be assigned to the Cardinal account
    when its existing KAM was promoted to director of key accounts in
    2019.       Cardinal is located in the Northeast, near Lestage's other
    accounts.       She was denied the Cardinal account.
    The    parties   dispute   whether   the   four   new   accounts
    assigned to Lestage were high-performing accounts which would
    allow Lestage to meet her growth targets.
    3 Hansen testified to several additional reasons that
    Lestage was not returned to the ABC account.           ABC was in
    negotiations to merge with another business, so Hansen did not
    think it was a good time to change account managers. There were
    several ongoing marketing campaigns Hansen did not want to disrupt.
    - 9 -
    Lestage testified that Blackburn's had "some" but not
    "substantial" growth potential, that it was not willing to engage
    in marketing campaigns with Coloplast and did not have an "outside
    sales force" which would allow Lestage to drive business to the
    account.     It grew at -2.8% in 2017 and 8.4% in 2018.
    AmerisourceBergen is a larger account with an outside
    sales force, but Lestage testified that due to AmerisourceBergen's
    lines   of   business,   which   do   not   overlap   substantially   with
    Coloplast's business, it was difficult for her to drive sales with
    that firm.     AmerisourceBergen grew at -17.4% in 2017 and 2.5% in
    2018.
    Geriatric was not a key account when it was assigned to
    Lestage.     Geriatric is also a long-term care distributor, and
    Coloplast does not focus on long-term care.            Geriatric's sales
    grew 23.9% in 2017.
    Concordance was a successful account which grew at 3.8%
    in 2017 and 18.1% in 2018.
    ABC grew at 76.4% in 2017 and 28.9% in 2018.
    Coloplast maintained at trial that the accounts Lestage
    was assigned were a reasonable mix of accounts with opportunity to
    grow.
    - 10 -
    II. District Court Proceedings
    In May 2016, Lestage amended her qui tam complaint to
    allege that Coloplast had retaliated against her in violation of
    the False Claims Act.
    A jury trial was held from April 8 through April 12,
    2019.   On April 9, the parties read twenty-seven joint factual
    stipulations to the jury, including one that stated that "Coloplast
    placed Ms. Lestage on a leave in response to Byram's request to
    have her removed from its account."
    Before   trial,     Coloplast      filed     a    Daubert    motion    to
    exclude the testimony of plaintiff's damages expert, economist Dr.
    Judith Roberts. The court reserved decision on the motion. Before
    permitting Dr. Roberts to take the stand, the district court asked
    Lestage's    counsel        several    questions         about     Dr.     Roberts'
    methodology. The court instructed the jury that Dr. Roberts "ha[d]
    to be qualified" and that "[the district court] ha[d] to make a
    judgment as to whether she's qualified."               The district court then
    conducted in front of the jury a preliminary examination as to Dr.
    Roberts' qualifications, during which Coloplast's counsel asked
    Dr. Roberts several questions about her methodology, before the
    court decided her testimony was admissible.
    Dr.    Roberts    estimated      the   difference       between       the
    compensation      Lestage    would    make     but-for       Coloplast's   alleged
    retaliation and the compensation she will actually make.                          To
    - 11 -
    estimate those losses, Dr. Roberts took the following steps.
    First, she took Lestage's compensation in 2013 and 2014, the two
    years pre-leave, as a baseline of what Lestage's compensation would
    have been but-for the leave and account reassignment.           She then
    took Lestage's 2017 and 2018 compensation, the two years post-
    leave, as a baseline of what Lestage's compensation will be in
    future   years.   She   then   assumed,   based   on   data   taken   from
    Payscale.com regarding the compensation of similarly situated
    salespeople, that Lestage's compensation would grow at a rate of
    1.04% per year.   She took the difference between the without-leave
    and with-leave compensation to estimate the loss in each year for
    the next 20.4 years, the number of years she predicts Lestage will
    stay in the workforce.     To estimate total loss, she discounted
    each year's damages to adjust for the likelihood that Lestage would
    leave Coloplast before that year.
    Coloplast presented a competing expert witness, Frances
    McCloskey, who challenged Dr. Roberts' assumptions and methodology
    and concluded that Lestage had not suffered any economic loss.
    After the close of Lestage's evidence, Coloplast moved
    for judgment as a matter of law under Rule 50.          Fed. R. Civ. P.
    50.
    On the final day of trial, the district court reviewed
    its proposed jury instructions with counsel.       As to causation, it
    instructed the jury that it could find for Lestage if she proved
    - 12 -
    that her participation in the qui tam suit was a "substantial
    motivating cause" of each adverse employment action.              Coloplast
    did not object to this instruction.
    The jury returned its verdict on April 12, 2019.              The
    jury found that Coloplast had retaliated against Lestage by placing
    her on leave and assigning her inferior accounts upon her return
    and awarded Lestage $762,525.
    After trial, Coloplast filed a motion for a new trial
    under Rule 59 on the grounds that the damages were excessive, that
    Dr. Roberts' testimony was inadmissible and prejudicial, and that
    the verdict was against the clear weight of the evidence.             Fed. R.
    Civ. P. 59(a).      Coloplast also renewed its motion for judgment as
    a matter of law under Rule 50(b). Fed. R. Civ. P. 50(b). Coloplast
    argued that no reasonable jury could find that Coloplast had placed
    Lestage on leave because of the qui tam action, that Lestage had
    suffered compensatory damages, that Lestage's account assignments
    on   her   return   were   materially   adverse,    or   that   the   account
    assignments were retaliatory.           The district court denied both
    motions.
    As to the new trial motion, the district court explained
    that Dr. Roberts' testimony was admissible because Dr. Roberts was
    qualified and she had used a "straight-forward and rational method
    for approximating otherwise opaque sums."          Any dispute between the
    parties concerned only the assumptions underlying the model, and
    - 13 -
    Coloplast had ample opportunity on cross-examination and during
    its own expert's testimony to expose any weaknesses in those
    assumptions.     And since Dr. Roberts' testimony was admissible,
    Coloplast's other arguments failed as well.
    As to the motion for judgment as a matter of law, the
    court held Lestage had presented sufficient evidence that she was
    placed on leave because of the qui tam suit and of damages -- both
    emotional and to her working relationships -- incurred while on
    leave.     She had also presented evidence, which the jury could
    reasonably credit, that Hansen had "stymied" her return to the ABC
    account and assigned her sub-par accounts.
    This appeal followed.
    III. Analysis
    We first address the claim of error as to the jury
    instructions, followed by the motion for judgment as a matter of
    law and the claims of error as to Dr. Roberts'             testimony.
    A. Jury Instructions
    For the first time on appeal Coloplast argues that the
    "substantial motivating factor" instruction was error and should
    have been a "but-for" instruction.
    Because Coloplast did not object to this instruction
    below, we review this claim for plain error.           Teixeira v. Town of
    Coventry   ex   rel.   Przybyla,   
    882 F.3d 13
    ,   16   (1st   Cir.   2018)
    ("Unpreserved claims of instructional error . . . are reviewed
    - 14 -
    only for plain error." (citing United States v. Deppe, 
    509 F.3d 54
    , 58 (1st Cir. 2007))).         To demonstrate plain error, the party
    advancing the claim of error must establish "(1) that an error
    occurred (2) which was clear or obvious and which not only (3)
    affected   the   defendant's      substantial    rights,    but   also       (4)
    seriously impaired the fairness, integrity, or public reputation
    of judicial proceedings."         Id. at 18 (quoting United States v.
    Duarte, 
    246 F.3d 56
    , 60 (1st Cir. 2001)).        "'[P]lain error' is 'an
    indisputable error by the judge, given controlling precedent.'"
    Clukey v. Town of Camden, 
    894 F.3d 25
    , 33 (1st Cir. 2018) (quoting
    United States v. Ponzo, 
    853 F.3d 558
    , 582 (1st Cir. 2017)).                 This
    circuit has demonstrated "marked reluctance to find plain error in
    civil cases."    Dimanche v. Mass. Bay Transp. Auth., 
    893 F.3d 1
    , 10
    (1st Cir. 2018) (quoting Acevedo-Garcia v. Monroig, 
    351 F.3d 547
    ,
    570 (1st Cir. 2003)).       The plain error hurdle is especially high
    where an appellant relies on a claim of instructional error.                See
    Teixeira, 882 F.3d at 18.
    The    False     Claims     Act    forbids      employers        from
    discriminating    against    an    employee   "because   of"   his     or    her
    protected conduct.    
    31 U.S.C. § 3730
    (h)(1); see also Guilfoile v.
    Shields, 
    913 F.3d 178
    , 187-88 (1st Cir. 2019). The parties dispute
    the proper meaning of "because of."
    In 2004, this circuit said in passing, and not in a
    holding, that an employee making a retaliation claim under the
    - 15 -
    False Claims Act must "show that 'the retaliation was motivated,
    at   least    in    part,    by   the    employee's        engaging    in   protected
    activity.'"     U.S. ex rel. Karvelas v. Melrose-Wakefield Hosp., 
    360 F.3d 220
    , 239 (1st Cir. 2004), abrogated on other grounds by
    Allison Engine Co. v. U.S. ex rel. Sanders, 
    553 U.S. 662
     (2008)
    (quoting S. Rep. No. 99-345, at 35, reprinted in 1986 U.S.C.C.A.N.
    5266, 5300).
    Five years later, the Supreme Court decided Gross v. FBL
    Financial Services, Inc., 
    557 U.S. 167
    , 176 (2009), and four years
    after that, University of Texas Southwestern Medical Center v.
    Nassar, 
    570 U.S. 338
    , 350-52 (2013).                  In Gross, the Court held
    that in order to make out a claim under the Age Discrimination in
    Employment     Act,    which      forbids     employers      from     discriminating
    against      individuals      "because       of    such    individual's       age,"     a
    plaintiff     must    show    that   age     was    the    but-for    cause    of     the
    employer's adverse employment action.                
    557 U.S. at 176
    ; see also
    
    29 U.S.C. § 623
    (a).          In Nassar, the Court relied on Gross to hold
    that   plaintiffs      bringing         claims     under    the     anti-retaliation
    provision      of    Title     VII      --   which    forbids        employers      from
    discriminating against an individual "because" he has challenged
    the employer's practices -- must prove that retaliation "was the
    but-for cause of the challenged employment action."                      570 U.S. at
    352.
    - 16 -
    Since Nassar and Gross, several circuits have applied
    the but-for standard in retaliation claims under the False Claims
    Act,       reasoning   that   the   statutory   language   is   "materially
    identical" to that in Nassar and Gross.          See Nesbitt, 945 F.3d at
    1359-60 (collecting cases).4           We agree that given the nearly
    identical statutory language, retaliation claims under the False
    Claims act must be evaluated under the but-for causation standard.
    The instructions were error but they were not plain error
    because this circuit had never decided the question pre- or post-
    Nassar.      Further, even after Nassar, several circuits continued to
    use a motivating factor test.           See, e.g., Singletary v. Howard
    Univ., 
    939 F.3d 287
    , 293 (D.C. Cir. 2019).             We add that it is
    difficult to fault the district court when Coloplast's trial
    counsel failed to call this issue to the court's attention either
    at the charge conference or immediately following the court's
    rendition of its jury instructions, even though these events
    transpired some six years after Nassar was decided.              Under the
    circumstances, the error hardly can be said to be indisputable.
    4  Some circuits have continued to use a "motivating
    factor" standard, but we agree with the Eleventh Circuit's
    reasoning in Nesbitt that such a test is at odds with the Supreme
    Court's decisions in Nassar and Gross. See Nesbitt, 945 F.3d at
    1360-62.
    - 17 -
    B. Rule 50 Motion for Judgment as a Matter of Law
    We review de novo the denial of a post-trial motion for
    judgment as a matter of law.         Analysis Grp., Inc. v. Cent. Fl.
    Invs., Inc., 
    629 F.3d 18
    , 22 (1st Cir. 2010).                "Our review is
    weighted toward preservation of the jury verdict because a verdict
    should be set aside only if the jury failed to reach the only
    result permitted by the evidence."          
    Id.
     (quoting Quiles-Quiles v.
    Henderson, 
    439 F.3d 1
    , 4 (1st Cir. 2006)) (internal quotation marks
    omitted) (alterations in original omitted). We review the evidence
    in the light most favorable to the non-moving party.                 Cham v.
    Station Operators, Inc., 
    685 F.3d 87
    , 93 (1st Cir. 2012).
    We assess False Claims Act retaliation claims under the
    McDonnell-Douglas      burden-shifting      framework.       Harrington    v.
    Aggregate Indus. Ne. Region, Inc., 
    668 F.3d 25
    , 30-31 (1st Cir.
    2012); see also McDonnell-Douglas Corp. v. Green, 
    411 U.S. 792
    ,
    802-03 (1973).     Under this framework, to establish a prima facie
    case of retaliation, Lestage must show (i) that she engaged in
    protected conduct under the False Claims Act, (ii) that Coloplast
    knew   she   engaged   in   such   conduct,   and    (iii)   that   Coloplast
    retaliated against her because of this conduct.              Id. at 31; see
    also 
    31 U.S.C. § 3730
    (h)(1).
    Once the plaintiff makes out a prima facie case, the
    burden shifts to the employer to articulate a non-retaliatory
    reason for the adverse employment action.           Harrington, 668 F.3d at
    - 18 -
    31.   This is merely a burden of production.                 Mesnick v. Gen. Elec.
    Co., 
    950 F.2d 816
    , 823 (1st Cir. 1991).                  If the employer produces
    evidence of a legitimate motive, the burden remains with the
    plaintiff      to    show   "that       the    proffered    reason     is    a    pretext
    calculated to mask retaliation."                
    Id.
     (citing Mesnick, 
    950 F.2d at 827
     (1st Cir. 1991)).            Courts then will look "to the record as a
    whole to determine whether there is sufficient evidence of 'pretext
    and retaliatory animus'" to sustain the jury verdict. 
    Id.
     (quoting
    Mesnick, 
    950 F.2d at 827
    ); see also id. at 33 ("'[W]eaknesses,
    implausibilities,               inconsistencies,            incoherencies,               or
    contradictions in the employer's proffer[]' can give rise to an
    inference of pretext." (quoting Morgan v. Hilti, Inc., 
    108 F.3d 1319
    , 1323 (10th Cir. 1997)) (alterations in original)).
    As explained above, the protected conduct must have been
    the but-for cause of the adverse employment action.                     We apply the
    but-for standard to evaluate Coloplast's Rule 50 motion despite
    its   failure       to   object    to    the    district     court's    "substantial
    motivating factor" instruction below.                   See Boyle v. United Techs.
    Corp.,   
    487 U.S. 500
    ,     513-14      (1988);      City   of   St.       Louis   v.
    Praprotnik, 
    485 U.S. 112
    , 120 (1988) (plurality opinion) ("[T]he
    failure to object to an instruction does not render the instruction
    the 'law of the case' for purposes of appellate review of the
    denial of a directed verdict or judgment notwithstanding the
    verdict" (quoting City of Springfield, Mass. v. Kibbe, 480 U.S.
    - 19 -
    257, 264 (1987) (O'Connor, J., dissenting))); see also Fisher v.
    City of San Jose, 
    558 F.3d 1069
    , 1074 (9th Cir. 2009) (holding
    that in evaluating Rule 50 motions, appellate courts must "apply
    the law as it should be, rather than the law as it was read to the
    jury, even if the party did not object to the jury instructions."
    (quoting Pincay v. Andrews, 
    238 F.3d 1106
    , 1109 n.4 (9th Cir. 2001)
    (internal quotation marks omitted))).
    Coloplast argues evidentiary insufficiency as to the
    jury's conclusions (a) that Coloplast put Lestage on leave and
    assigned   her     particular    accounts       "because     of"    her    protected
    conduct and (b) that the assignment of accounts following Lestage's
    return to Coloplast was an adverse employment action.
    As to the first contention, we clear away Coloplast's
    meritless argument that the stipulation "Coloplast placed Ms.
    Lestage on a leave in response to Byram's request to have her
    removed    from    its    accounts"     forecloses        Lestage   from    proving
    causation.        The    stipulation    had     to   do   with   temporality    and
    established only that Byram's letter set off the chain of events
    resulting in Lestage's leave.            It was hardly a concession that
    there was no retaliation.5
    5    Stipulations are interpreted according to general
    contract law principles. Gomez v. Rivera Rodriguez, 
    344 F.3d 103
    ,
    121 (1st Cir. 2003). Contracts are interpreted to "effectuate the
    intent of the parties."      VFC Partners 26, LLC v. Cadlerocks
    Centennial Drive, LLC, 
    735 F.3d 25
    , 29 (1st Cir. 2013). It strains
    credulity that Lestage would have stipulated that Byram's letter
    - 20 -
    Moving on, there was more than sufficient evidence that
    Lestage would not have been placed on leave but-for her protected
    action.      A jury could conclude that Coloplast knew Byram's request
    was in retaliation for her qui tam suit and that the two companies'
    lawyers discussed it.        Coloplast could have simply removed Lestage
    from the Byram account but chose not to do so.             Instead it put her
    on leave, removing her from the premises and eliminating her
    physical and online presence, not even telling one of her accounts
    that she was gone.
    Coloplast offered two justifications for putting Lestage
    on   leave    instead   of   just   taking    her   off   the    Byram   account.
    Coloplast says it put Lestage on leave because Byram's letter might
    have signaled "broader" issues with Lestage's performance.                  That
    explanation is undercut by at least two facts.                  First, Coloplast
    showed no evidence that it actually did any investigation into
    Lestage's work performance.         Second, it did not bring Lestage back
    to work until after the qui tam suit was resolved.
    A jury could also reject Coloplast's justification that
    she would not be able to meet her bonus targets if taken off the
    Byram account.      Given the individualized and oft-changing nature
    of KAM bonus calculations, the fact that Coloplast was willing to
    simply pay Lestage an 100% bonus while she was on leave, and the
    alone would have caused Coloplast to place Lestage on leave. Such
    a stipulation would have hamstrung her case before it even began.
    - 21 -
    fact that accounts were moved between KAMs with some regularity,
    Coloplast could easily have found a satisfactory way to recalculate
    Lestage's bonus even if she were taken off the Byram account.
    A reasonable jury could decide that Coloplast's reasons
    were pretextual, and thus conclude that the leave was retaliatory.
    See Harrington, 
    668 F.3d at 33
    .
    Coloplast's second argument that the account assignments
    on   Lestage's     return   were       not     adverse      employment     actions
    misunderstands the law.         Employment action is materially adverse
    when it would "dissuade[] a reasonable worker" from engaging in
    protected    activity.          See    Rodríguez-Vives        v.   Puerto     Rico
    Firefighters Corps of Puerto Rico, 
    743 F.3d 278
    , 284 (1st Cir.
    2014) (quoting Burlington N. & Santa Fe Ry. Co. v. White, 
    548 U.S. 53
    , 68 (2006)).     Examples of adverse employment actions include "a
    decrease in wage or salary . . . significantly diminished material
    responsibilities, or other indices that might be unique to a
    particular situation."          Morales-Vallellanes v. Potter, 
    605 F.3d 27
    , 36 (1st Cir. 2010) (quoting Lapka v. Chertoff, 
    517 F.3d 974
    ,
    986 (7th Cir. 2008) (discussing Title VII retaliation)).                       Our
    earlier discussion of the facts concerning the markedly lesser
    accounts    she   was   given    on   return    and   the    actions     Coloplast
    deliberately failed to take disposes of this argument.
    Finally, a jury could readily conclude that the account
    assignments were in retaliation for her filing the qui tam action.
    - 22 -
    Coloplast tried to justify its actions through Hansen's testimony.
    He testified that reassigning her to a different slate of accounts
    was   not   feasible   based     on    existing    client    relationships     and
    geography, but there was contrary evidence.
    Coloplast's handling of the ABC account was particularly
    telling.    A jury could conclude Coloplast had led ABC to complain
    that she had been tardy by not immediately informing ABC she was
    on leave and had no access to her email accounts to respond to
    ABC's inquiry.      Indeed, such a remarkable failure to do so would
    be strong evidence of pretext.
    Beyond that, Coloplast never attempted to return the ABC
    account to Lestage, despite its being reassigned several times
    after Wurgler's departure.            And when the Cardinal account became
    available in Lestage's region, it was given to another KAM, despite
    Coloplast's asserted preference for assigning KAMs to accounts
    located near their homes.
    There   are   many    reasons       Congress    decided   to   protect
    persons who file qui tam actions from retaliation for doing so.
    Such protections encourage individuals to expose fraud.                    S. Rep.
    No. 110-507, at 26 (2008).        The False Claims Act exists to protect
    the federal government from fraud.               Id. at 6-7.     The jury here
    supportably found on sufficient evidence against Coloplast on the
    retaliation claim.
    - 23 -
    C. Claims Concerning Dr. Roberts' Expert Testimony
    Coloplast also requests a new trial on the grounds that
    the jury based its verdict on Dr. Roberts' allegedly unreliable
    testimony.      Coloplast argues that the district court did not
    properly perform its gatekeeping role under Daubert v. Merrell Dow
    Pharmaceuticals, 
    509 U.S. 579
     (2003).         Coloplast also argues that
    Dr. Roberts' testimony should not have been admitted because it
    rested on flawed methodology and unrealistic assumptions.6
    We review de novo the question of whether the district
    court performed its gatekeeping function.           Smith v. Jenkins, 
    732 F.3d 51
    , 64 (1st Cir. 2013).        Unless the district court entirely
    abdicated its gatekeeper role, we review the district court's
    decision   to    admit   expert   testimony   for   abuse   of   discretion.
    Packgen v. Berry Plastics Corp., 
    847 F.3d 80
    , 85 (1st Cir. 2017).
    The law on the district court's gatekeeper function
    under Rule 702 and Daubert is familiar and we have no need to
    recite it.      509 U.S. at 592-95.    Coloplast's argument is without
    6    Coloplast argues that the years before Lestage's leave
    were unusually good years for Lestage and the years following her
    return were unusually bad years for her. Thus, assuming that her
    without-retaliation income would be similar to her best years while
    her with-retaliation income would be similar to her worst years
    resulted in Dr. Roberts overstating Lestage's damages. Coloplast
    next argues that Dr. Roberts' analysis should have used Coloplast-
    specific data to estimate Lestage's income and future income
    growth. Finally, Coloplast takes issue with Dr. Roberts projecting
    Lestage's loss forward over roughly twenty years.
    - 24 -
    merit.       The district court did not fail to perform a gatekeeping
    function.          How it chose to do so was within its discretion. See
    Lawes v. CSA Architects and Eng'rs LLP, 
    963 F.3d 72
    , 99 (1st Cir.
    2020).
    Dr. Roberts' model was reasonable and her assumptions
    were       duly    challenged   on   cross-examination   and   in   McCloskey's
    testimony.7         Coloplast's quarrel is with the jury's assessment of
    the evidence and is devoid of any merit.                 The district court
    properly denied a new trial on this ground.
    7  Dr. Roberts also offered explanations for each of her
    assumptions. See Cummings v. Standard Reg. Co., 
    265 F.3d 56
    , 65
    (1st Cir. 2001) (rejecting defendant's challenges that plaintiff's
    expert used generic rather than company-specific data and based
    lost wages on "unusually high earning[] year" because during cross-
    examination, expert "offered sufficient explanations" for his
    choice of data).
    As to why she used data only from 2013 and 2014 as
    Lestage's baseline without-retaliation compensation rather than
    including Lestage's lower-earning years in 2011 and 2012, Dr.
    Roberts explained that Lestage's income was growing at about 12%
    per year from 2011-2014, and thus that the data from 2011 and 2012
    would unfairly understate her current earning capacity.
    As to why Dr. Roberts assumed that Lestage's post-leave
    compensation would not revert to her previous performance, Dr.
    Roberts explained that Lestage's compensation was dependent on the
    way her target growth rates were set by Coloplast.          Because
    Coloplast ultimately had control over Lestage's compensation, Dr.
    Roberts said she had no basis to assume that Lestage's income would
    go back to her pre-leave highs.
    As to the duration of the twenty-year projection, Dr.
    Roberts explained that she adjusted the measure of damages each
    year based on the probability that Lestage would still be at
    Coloplast.
    - 25 -
    IV. Conclusion
    The judgment of the district court is affirmed.   Costs
    are awarded to Lestage.
    - 26 -