Deborah Zellers v. Nextech Northeast, LLC , 533 F. App'x 192 ( 2013 )


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  •                               UNPUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 12-2267
    DEBORAH ZELLERS,
    Plaintiff - Appellant,
    v.
    NEXTECH NORTHEAST, LLC,
    Defendant – Appellee,
    v.
    RITE AID OF VIRGINIA, INC.,
    Third Party Defendant.
    Appeal from the United States District Court for the Eastern
    District of Virginia, at Alexandria. Gerald Bruce Lee, District
    Judge. (1:11-cv-00967-GBL-TRJ)
    Submitted:   June 7, 2013                   Decided:   July 17, 2013
    Before NIEMEYER, SHEDD, and THACKER, Circuit Judges.
    Affirmed by unpublished per curiam opinion.
    Davis Hilton Wise, WISE & DONAHUE, PLC, Fairfax, Virginia, for
    Appellant.   Michael  Allweiss,   ALLWEISS  &   ALLWEISS,  St.
    Petersburg, Florida; Daniel D. Barks, THE LAW OFFICE OF DANIEL
    D. BARKS, Alexandria, Virginia; Ellis R. Lesemann, Amanda M.
    Blundy, HARVEY & VALLINI, LLC, Mt. Pleasant, South Carolina, for
    Appellee.
    Unpublished opinions are not binding precedent in this circuit.
    2
    PER CURIAM:
    In this negligence action brought by Appellant Deborah
    Zellars        (“Ms.   Zellars”)         against        NexTech         Northeast          LLC
    (“NexTech”),      an   HVAC    contractor,        Ms.   Zellars      proffered         three
    expert witnesses to testify that she was injured by allegedly
    excessive       exposure      to    refrigerant         gas     at      her        place   of
    employment, a Rite Aid in Arlington, Virginia.                             The district
    court excluded the testimony of each proffered expert, leaving
    Ms.    Zellars    without     any   expert       testimony      on   the       element     of
    causation.        Accordingly,       the    district         court   granted         summary
    judgment in favor of NexTech.                   On appeal, Ms. Zellars asserts
    that the district court abused its discretion in excluding the
    testimony of each of the three proffered causation experts and
    that,    therefore,     the    district         court   also     erred        in    granting
    summary judgment in favor of NexTech.                   However, because we agree
    with     the    district    court    that       none    of    Ms.    Zellars’s         three
    proffered       causation      experts      offered          relevant      or       reliable
    scientific testimony, we affirm.
    I.
    Appellant Ms. Zellars worked as a shift supervisor at
    a Rite Aid store in Arlington, Virginia (the “Arlington Rite
    Aid”).     Her duties included, among other things, rearranging and
    organizing retail products displayed in retail display freezers
    located throughout the store.               Appellee NexTech is a commercial
    3
    contractor that works in the heating, cooling, and refrigeration
    business.       During all relevant times, NexTech had a contract
    with Rite Aid pursuant to which NexTech would maintain and, as
    necessary, repair refrigerators at several area Rite Aid stores.
    On September 9, 2009, NexTech responded to a service
    call related to a perceived refrigerant leak.             On that visit,
    NexTech added a disputed quantity of R-404A Freon (“R-404A”)
    refrigerant to the freezer in question. 1             Two days later, on
    September 11, 2009, NexTech again responded to a service call
    from the Arlington Rite Aid about the same freezer.               However,
    during   this    visit,   NexTech   determined    that   the   freezer   was
    functioning appropriately and, as a result, did not take any
    corrective action.
    Less   than   one   week   later,   on   September   16,   2009,
    Carrie Hare, the manager of the Arlington Rite Aid, placed a
    call to the Arlington Fire Department indicating that Rite Aid
    employees had been complaining of headaches and other symptoms
    for a period of “weeks” and suggesting this condition was caused
    by a leak in the previously-serviced freezer.             Members of the
    1
    Based on an ambiguous billing entry, Ms. Zellars contends
    that NexTech added 25 lbs. of R-404A refrigerant to the system
    while NexTech contends that it merely added 2.5 lbs. While the
    parties vigorously disputed this issue both below and in their
    briefs, the resolution of this factual dispute is unnecessary to
    our disposition of this appeal.
    4
    fire       department’s     hazardous      materials         team   proceeded    to   the
    store, where they detected a small leak in the freezer. 2                          After
    the hazardous materials team had completed its assessment, a
    call       was   placed    to   NexTech,       who   responded      by   dispatching    a
    technician to the store.              The technician determined that a valve
    on the refrigerator was leaking refrigerant gas and repaired the
    leak.
    Minutes     before      the       NexTech     technician       finished
    repairing the freezer, Ms. Zellars reported to work.                        Soon after
    arriving, she reported to Ms. Hare that she was feeling ill,
    specifically complaining of shortness of breath, dizziness, and
    a headache.          In response, Ms. Zellars was taken to the local
    emergency        room,     where   she   was       diagnosed    with     anemia.      Her
    treating physicians then offered her a blood transfusion, which
    she refused, indicating that her condition had improved.
    Ms. Zellars and Ms. Hare commenced the present action
    in the United States District Court for the Eastern District of
    Virginia in 2011, 3 alleging that NexTech had breached its common
    law duty of care in failing to properly service the freezer and
    2
    At that time, the hazardous materials team members also
    noted that oxygen levels in the store around the freezer were
    normal. Accordingly, they opted not to close the store.
    3
    Ms. Hare’s action was disposed of in the same order as Ms.
    Zellars’s; however, only Ms. Zellars’s case is presently before
    us on appeal.
    5
    in   failing      to    detect    and   repair          the   refrigerant     leak     before
    September 16, 2009.              Additionally, the complaint alleges that
    this breach proximately caused a variety of personal injuries,
    and plaintiffs proffered testimony from each of their treating
    physicians        and    other     experts         in     attempt     to     support       this
    assertion.
    Of    relevance       to    the       present        appeal,     Ms.     Zellars
    offered     written       reports       and    deposition          testimony        from    the
    following expert witnesses: (1) Dr. Vandana Sharma, M.D., Ms.
    Zellars’s      treating     physician,         who       opined     that    Ms.     Zellars’s
    condition was caused by exposure to a neurotoxin, possibly a
    refrigerant gas; 4 (2) Dr. Robert Simon, Ph.D., a chemist who
    testified that Ms. Zellars had experienced symptoms that were
    consistent with the adverse health effects of overexposure to R-
    404A       refrigerant;          (3)     Dr.       Raymond         Singer,        Ph.D.,     a
    neurotoxicologist who testified that Ms. Zellars’s symptoms were
    both consistent with and caused by exposure to R-404A; and (4)
    4
    In her initial report, Dr. Sharma specifically opined that
    Ms. Zellars’s condition was caused by refrigerant gas exposure.
    However, as the district court observed, Dr. Sharma backed away
    from that statement at her deposition, testifying only that Ms.
    Zellars’s condition was caused by neurotoxin exposure and that
    refrigerant gas was merely one possible source.       Zellars v.
    NexTech Northeast, LLC, 
    895 F. Supp. 2d 734
    , 746 (E.D. Va. 2012)
    (“Dr. Sharma maintains that Ms. Zellars’s neurological condition
    was caused by some toxicity or toxic event, but she no longer
    offers exposure to refrigerant gas as the specific cause to a
    reasonable degree of medical certainty.”)
    6
    Ronald Bailey, an HVAC engineer who testified that NexTech had
    breached the applicable standard of care in its maintenance of
    the display refrigerators.
    In response, NexTech filed several motions, including
    motions      in   limine     to   exclude    the    testimony     of    each    of   the
    plaintiffs’        proffered      experts,      and     a    motion     for     summary
    judgment.          The     plaintiffs   filed       a   motion       for     sanctions,
    requesting        an   adverse    inference     based       on   NexTech’s     alleged
    spoliation of evidence. 5           The district court held a hearing on
    all of these motions on July 13, 2012.
    On July 19, 2012, the district court granted NexTech’s
    motions as to three of the four proffered experts: Dr. Sharma,
    Dr. Simon, and Dr. Singer.              This left Ms. Zellars without any
    expert testimony on the issue of causation.                      Thus, the district
    court determined that Ms. Zellars could not sustain her burden
    to   prove    that     her   injuries   were    caused      by   NexTech’s     alleged
    negligence and, therefore, granted NexTech’s motion for summary
    judgment.         Finally,    the   district       court    denied     Ms.    Zellars’s
    5
    Specifically, Ms. Zellars points to the fact that, on
    August 24, 2011, NexTech “evacuated” the disputed freezer,
    removing and replacing all of the existing refrigerant.     Ms.
    Zellars argues that this amounts to spoliation of the evidence,
    as the type of refrigerant in place in the system in September
    2009 is relevant to its case.        Accordingly, Ms. Zellars
    requested the district court to permit an adverse inference
    against NexTech.
    7
    motion for sanctions as moot.                  Ms. Zellars timely noted this
    appeal.
    II.
    We review a district court’s award of summary judgment
    de novo.     Dooley v. Hartford Acc. & Indem. Co., 
    716 F.3d 131
    ,
    135 (4th Cir. 2013).             However, we review a district court’s
    decision     to   admit     or     exclude      evidence,       including    expert
    testimony, for an abuse of discretion.                    Belk, Inc. v. Meyer
    Corp., U.S., 
    679 F.3d 146
    , 161 (4th Cir. 2012).                      Similarly, a
    district court’s refusal to apply an adverse inference based on
    a party’s alleged spoliation of evidence “must stand unless it
    was an abuse of its broad discretion in this regard.”                        Vulcan
    Materials Co. v. Massiah, 
    645 F.3d 249
    , 260 (4th Cir. 2011)
    (citations omitted).
    III.
    A.
    Expert Testimony
    Ms.   Zellars    first     argues      that    the    district    court
    abused its discretion in excluding the testimony of Dr. Sharma,
    Dr. Singer, and Dr. Simon.           In toxic tort cases, “[i]n order to
    carry the burden of proving a plaintiff’s injury was caused by
    exposure     to   a    specified       substance,         the    plaintiff       must
    demonstrate the levels of exposure that are hazardous to human
    beings     generally   as    well     as       plaintiff’s      actual   level    of
    8
    exposure.”        Westberry v. Gislaved Gummi AB, 
    178 F.3d 257
    , 263
    (4th       Cir.   1999)    (internal    citations    and       quotations   marks
    omitted). 6       Generally, this must be done through the use of
    relevant and reliable expert testimony.                  See, e.g., Cooper v.
    Smith & Nephew, Inc., 
    259 F.3d 194
    , 199 (4th Cir. 2001) (“[A]ll
    of Cooper’s claims required expert medical testimony that the
    Rogozinski System was the proximate cause of his injuries[.]”)
    Rule   702   of   the    Federal   Rules    of    Evidence,   which
    governs the admissibility of expert witness testimony, provides:
    A witness who is qualified as an expert by knowledge,
    skill, experience, training, or education may testify
    in the form of an opinion or otherwise if (a) the
    expert’s scientific, technical, or other specialized
    knowledge will help the trier of fact to understand
    the evidence or to determine a fact in issue; (b) the
    testimony is based on sufficient facts or data; (c)
    the testimony is the product of reliable principles
    and methods; and (d) the expert has reliably applied
    the principles and methods to the facts of the case.
    Fed. R. Evid. 702.          Pursuant to this rule, the trial judge is
    assigned the task of “ensuring that an expert’s testimony both
    rests on a reliable foundation and is relevant to the task at
    hand.”       Daubert v. Merrell Dow Pharm., Inc., 
    509 U.S. 579
    , 588
    (1993).
    6
    These two levels of causation are known as “general
    causation” and “specific causation.” See, e.g., Bourne ex rel.
    Bourne v. E.I. Dupont de Nemours & Co., Inc., 
    189 F. Supp. 2d 482
    , 485 (S.D. W. Va. 2002) (“In a toxic tort case, a plaintiff
    must generally establish both general and specific causation for
    his injuries.”), aff’d, 85 F. App’x 964 (4th Cir. 2004).
    9
    This     involves       a       two-pronged       inquiry.            First,     the
    district    court     must    determine             whether    the   proffered          expert
    testimony concerns scientific knowledge.                        Second, the district
    court must determine whether that testimony will assist in the
    determination of a fact in issue.                     Daubert, 
    509 U.S. at 592
    .                In
    other words, “[t]he first prong of this inquiry necessitates an
    examination of whether the reasoning or methodology underlying
    the expert’s proffered opinion is reliable,” and “[t]he second
    prong of the inquiry requires an analysis of whether the opinion
    is relevant to the facts at issue.”                    Westberry, 
    178 F.3d at 260
    .
    Applying this test to the facts at hand, the district
    court   concluded      that     the          testimony    of    each        of    the       three
    proffered    causation        experts          was     unreliable      and,        therefore,
    inadmissible.       We agree on all counts.
    1.
    Exclusion of Dr. Sharma
    Dr.     Sharma     is       a     board     certified      neurologist           who
    maintains    a     practice     in          general    neurology.            In    a    report
    completed on February 24, 2012, Dr. Sharma indicated that she
    first evaluated Ms. Zellars in August 2011 for neck and back
    pain,   muscle       tenderness             and      stiffness,      jerking           of    the
    extremities, body tremors, and other symptoms.                         In        that report,
    Dr. Sharma opined, to a reasonable degree of medical certainty,
    that Ms. Zellars’s symptoms were caused by exposure to R-404A
    10
    refrigerant gas in September 2009.                     However, at her subsequent
    deposition, Dr. Sharma softened this testimony, opining instead
    that Ms. Zellars’s condition was caused by a toxic event but
    declining to specifically identify the chemical involved.                          J.A.
    403   (“[T]oxicity       is   a   reasonable       medical     certainty.      Is    it
    related to Freon itself, I cannot opine on that.”). 7                     Despite Dr.
    Sharma’ equivocal testimony, Ms. Zellars maintains, both before
    the district court and on appeal, that Dr. Sharma’s testimony is
    sufficiently relevant and reliable.                We disagree.
    First, as the district court held, Dr. Sharma lacks
    the requisite qualifications to offer expert testimony in the
    field of toxicology.          Dr. Sharma is a neurologist.                 By her own
    admission, she does not have any specialized training in the
    field of toxicology.          J.A. 404 (Dr. Sharma: “I do not have any
    training in toxicology.”).           This is further evinced by the fact
    that,     during   her    deposition,      Dr.     Sharma      indicated    that    her
    knowledge    of    refrigerant      gas    toxicity       primarily   came    from    a
    survey of scientific articles downloaded from the internet.
    Ms.    Zellars       argues        that     Dr.   Sharma’s     lack     of
    toxicology expertise is immaterial, as her testimony is offered
    along with the testimony of Dr. Singer and Dr. Simon, both of
    7
    Citations to the Joint Appendix (“J.A.”) refer to the
    joint appendix filed by the parties in this appeal.
    11
    whom have more training in the field of toxicology.                              While it is
    true that there is no prohibition on utilizing multiple experts
    to establish various components of a party’s case, this does not
    change   Daubert’s        command      that    an     expert’s      testimony          must    be
    based    on       “more      than      subjective          belief      or        unsupported
    speculation.”         Daubert, 
    509 U.S. at 590
    .                     Because she lacks
    specific training in the field in which she seeks to testify,
    and because she was unable to state with specificity that any of
    Ms.   Zellars’s       alleged        injuries       were    caused    by     exposure         to
    refrigerant gas, Dr. Sharma simply cannot overcome this hurdle.
    Second,     the   district           court   properly      held         that    Dr.
    Sharma’s methodology was not sufficiently reliable.                               Dr. Sharma
    employed      a     method      known     as        “differential        diagnosis”            in
    evaluating Ms. Zellars.               Differential diagnosis is “a standard
    scientific        technique     of    identifying          the   cause      of    a    medical
    problem by eliminating the likely causes until the most probable
    one is isolated.”            Westberry, 
    178 F.3d at 262
    .                     Typically, a
    differential         diagnosis          “is         performed        after             physical
    examinations, the taking of medical histories, and the review of
    clinical      tests,      including      laboratory          tests.”             
    Id.
             When
    performed properly, expert testimony employing this methodology
    is admissible.         Westberry, 
    178 F.3d at 263
     (“We previously have
    upheld the admission of an expert opinion on causation based
    upon a differential diagnosis.”)
    12
    However, in this case, Dr. Sharma did not reliably
    apply the differential diagnosis technique.                 As the district
    court observed, Dr. Sharma could not even identify the intensity
    and duration of Ms. Zellars’s exposure R-404A.              See, e.g., J.A.
    448 (“[Dr. Sharma]: She put that she was exposed for a duration
    of   time   for   several   weeks   or    months   going   into   the   freezer
    multiple times.      But . . . I’m not able to opine on that because
    I don’t know the exact exposure.”)             While it is true, as Ms.
    Zellars argues, that precise information regarding a plaintiff’s
    level of exposure “is not always available, or necessary[,]”
    Westberry, 
    178 F.3d at 264
    , 8 it is also true that a “plaintiff
    must demonstrate the levels of exposure that are hazardous to
    8
    Ms. Zellars’s reliance on Westberry on this point is
    inapposite.    Specifically, in Westberry, we held that the
    plaintiff’s expert did not need to cite specific quantitative
    evidence regarding the plaintiff’s level of exposure because the
    record in that case clearly established that the plaintiff had
    been substantially exposed to the allegedly harmful substance in
    such a way that specific evidence was unnecessary.    Westberry,
    
    178 F.3d at 263
    . In particular, the allegedly harmful substance
    in that case was talc powder, and the record was replete with
    evidence of the plaintiff’s substantial exposure to talc. See,
    e.g., 
    id. at 264
     (“Westberry testified that the talc that
    settled from the air around his work area was so thick that one
    could see footprints in it on the floor. He further stated that
    he worked in clouds of talc and that it covered him and his
    clothes.”)    Here, there is no evidence of such substantial
    exposure. Thus, Westberry does not support Ms. Zellars’s claim
    that she need not put forth specific evidence regarding her
    level of exposure.
    13
    human beings generally as well as the plaintiff's actual level
    of exposure.”         
    Id. at 263
    .
    Thus, the district court did not abuse its discretion
    in excluding her testimony.
    2.
    Exclusion of Dr. Simon
    Dr.    Robert      K.     Simon     is    an    expert    in        analytical
    chemistry,       toxicology,           and   environmental        assessment.               His
    opinion was offered to establish that Ms. Zellars was exposed to
    excessive levels of R-404A and that she experienced symptoms
    consistent with such exposure.                   The district court held, and we
    agree,    that       Dr.   Simon’s       proffered       testimony      is    inadmissible
    under Daubert.
    First,      Dr.     Simon     has    no    scientific         or     technical
    knowledge that qualifies him to offer expert testimony in this
    case.         While Dr. Simon is a toxicologist, he has no expert
    training with regard to the toxicity of refrigerants.                              Moreover,
    by his own admission, Dr. Simon does not know the level of R-
    404A exposure that would be necessary to cause Ms. Zellars’s
    alleged health effects.                 J.A. 297 (“But what the dose would be
    that     is    required      for       Ms.   Zellars      to   respond,        I    have    no
    calculations         on.”).            Rather,     he    simply      asserts,           without
    scientific       support,        that    refrigerant       exposure      can       be   deadly
    under certain circumstances.                 Similar to Dr. Sharma, Dr. Simon’s
    14
    lack of expert knowledge on the subject of refrigerant toxicity
    renders     his    testimony       entirely          speculative       and,    therefore,
    inadmissible under Daubert.
    Dr. Simon also fails to identify any facts or data
    regarding    Ms.     Zellars’s      level       of    R-404A    exposure.         In    his
    initial report, Dr. Simon opined that the concentration of R-
    404A in the freezer “reached multiples of 1000 parts per million
    on   numerous      occasions       due     to    the     leaking       Shrader     valve,
    particularly between September 9, 2009 and September 16, 2009.”
    J.A. 1865 (alterations omitted).                     Dr. Simon based this opinion
    on   the    report    of     the     engineering         expert,       Ronald    Bailey.
    However, by his own admission, Dr. Simon did not review Mr.
    Bailey’s calculations as to the concentration of R-404A in the
    freezer.      J.A.    290    (“[Defense         Counsel]:       Have     you    seen    Mr.
    Bailey’s calculations?           [Dr. Simon]: No, I have seen his report.
    [Defense Counsel]: But no calculations?                         You’ve not seen any
    calculations?        [Dr.    Simon]:       He    hasn’t    provided       me    with    any
    calculations.”).          Additionally, Dr. Simon indicated that he did
    not know how much time Ms. Zellars spent working in the freezer.
    J.A. 184 (“[Defense Counsel]: Did she give you a time estimate
    of   how   much    time    she     spent    [working       in    the    freezer]       or   a
    percentage?       [Dr. Simon]: No, all she would say is this is what
    I did when I came into work.”).                 Thus, he has no reliable basis
    for determining the level of Ms. Zellars’s R-404A exposure.
    15
    Ms. Zellars argues that, in formulating his opinion,
    Dr. Simon permissibly relied on the testimony of Mr. Bailey to
    ascertain the level exposure in this case.                           However, the portion
    of Dr. Simon’s opinion that is based on Mr. Bailey’s work does
    not speak to Ms. Zellars’s level of exposure.                           Rather, it simply
    speaks to the levels of R-404A that were present in the freezer.
    Thus, even assuming Mr. Bailey’s calculations are accurate, Dr.
    Simon’s    opinion          was    not    based        on   any     specific       information
    regarding Ms. Zellars’s level of R-404A exposure.
    Accordingly,            the     district        court    did     not    abuse   its
    discretion in excluding Dr. Simon’s testimony.
    3.
    Exclusion of Dr. Singer
    Dr. Raymond Singer, Ph.D., is a neuropsychologist and
    neurotoxicologist whose opinion was offered to show that Ms.
    Zellars    “has       a    nervous    system          dysfunction     from     neurotoxicity
    consistent       with       and     caused       by     poisoning       with       refrigerant
    containing       fluorocarbons.”             J.A.       1866      (alterations       omitted).
    Thus, unlike Dr. Simon, who merely testified that Ms. Zellars’s
    symptoms    were       consistent         with    excessive         R-404A    exposure,     Dr.
    Singer    goes    a       step    further    by       indicating      that    Ms.    Zellars’s
    condition was, in fact, caused by her exposure to R-404A in the
    Arlington Rite Aid.
    16
    However,    as    the   district          court    properly         held,   Dr.
    Singer is not qualified to diagnose the cause of Ms. Zellars’s
    alleged    symptoms.         Dr.    Singer       is    not     a        medical    doctor.
    Moreover, Dr. Singer did not arrive at his own medical opinion.
    Instead, he based his opinion on Dr. Sharma’s initial report.
    J.A. 1036 (“[Dr. Singer]: I’m relying on Dr. Sharma to offer a
    neurological      opinion     about        the    cause        of        Ms.      Zellars’s
    conditions.”).        However, as discussed above, Dr. Sharma is no
    longer of the view that Ms. Zellars’s condition was caused by
    refrigerant gas exposure.           Rather, Dr. Sharma’s opinion is that
    R-404A     exposure    is    one    possible          cause    of        Ms.      Zellars’s
    condition.     Thus, the entire basis for Dr. Singer’s opinion on
    specific causation has been undermined as merely speculative.
    Accordingly,      the   district          court    did       not    abuse   its
    discretion in excluding his testimony.
    B.
    Motion for Summary Judgment
    Having excluded all three of Ms. Zellars’s causation
    experts,    the   district    court    held      that    Ms.       Zellars      could   not
    satisfy the causation element of her claim and, accordingly,
    granted NexTech’s motion for summary judgment.                      We agree.
    Summary     judgment      is    appropriate            if     the     available
    evidence reveals no genuine issue of material fact and that the
    movant is entitled to judgment as a matter of law.                          Fed. R. Civ.
    
    17 P. 56
    (a).         The   party    moving     for    summary       judgment      bears    the
    burden     of       establishing        the   absence    of     a    genuine      issue    of
    material fact, and a reviewing court must draw all reasonable
    inferences and resolve all disputed factual matters in favor of
    the nonmoving party.           Carr v. Deeds, 
    453 F.3d 593
    , 608 (4th Cir.
    2006).     Importantly, a complete failure of proof concerning an
    essential element of the plaintiff’s case necessitates a grant
    of summary judgment in favor of the defendant.                          Celotex Corp v.
    Catrett, 
    477 U.S. 317
    , 322-23 (1986).
    In     Virginia,      “a    plaintiff     who     seeks      to    establish
    actionable negligence must plead the existence of a legal duty,
    violation of that duty, and proximate causation which results in
    injury.”        Kellermann         v.   McDonough,      
    684 S.E.2d 786
    ,    790    (Va.
    2009)(citations omitted).                 To prove causation in a toxic tort
    action,    a    plaintiff      must       offer     relevant    and     reliable     expert
    testimony, as the health effects of toxic                      exposure to chemicals
    are    beyond        the    knowledge         and    experience       of    the     average
    layperson.          Here, with the exclusion of all three of plaintiff’s
    causation experts, there is a complete failure of proof on the
    critical element of causation.                  Thus, the district court’s grant
    of summary judgment was proper. 9
    9
    Because we affirm the district court’s grant of summary
    judgment in favor of NexTech on the element of causation, we
    need not determine whether the district court properly denied
    (Continued)
    18
    IV.
    For     the   foregoing   reasons,    the    judgment     of   the
    district   court    is   affirmed.    We   dispense    with   oral   argument
    because the facts and legal contentions are adequately presented
    in the materials before this court and argument would not aid
    the decisional process.
    AFFIRMED
    Ms. Zellars’s motion for sanctions.   Even if we were to permit
    an adverse inference to be drawn against NexTech for spoliation,
    that inference would go only toward the element of breach.    It
    would not aid Ms. Zellars on the element of causation.
    Accordingly, because Ms. Zellars would still fail to establish
    this element regardless of the adverse inference, we do not
    address this issue.
    19