Pugh v. Louisville Ladder, Incorporated , 361 F. App'x 448 ( 2010 )


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  •                                UNPUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 08-2141
    JAMES PAUL PUGH, III,
    Plaintiff - Appellee,
    v.
    LOUISVILLE LADDER,    INCORPORATED,    f/k/a   Louisville   Ladder
    Group, LLC,
    Defendant – Appellant,
    and
    HOME DEPOT U.S.A., INCORPORATED,
    Defendant.
    Appeal from the United States District Court for the Middle
    District of North Carolina, at Greensboro.   N. Carlton Tilley,
    Jr., Senior District Judge. (1:06-cv-00656-NCT-PTS)
    Argued:   September 25, 2009                 Decided:   January 5, 2010
    Before MOTZ and AGEE, Circuit Judges, and Mark S. DAVIS, United
    States District Judge for the Eastern District of Virginia,
    sitting by designation.
    Affirmed by unpublished opinion. Judge Davis wrote the opinion,
    in which Judge Motz and Judge Agee joined.
    ARGUED: James Donald Cowan, Jr., ELLIS & WINTERS, LLP, Cary,
    North Carolina, for Appellant.  Vance Barron, Jr., Greensboro,
    North Carolina, for Appellee.     ON BRIEF: Andrew Chamberlin,
    Dixie T. Wells, ELLIS & WINTERS, LLP, Greensboro, North
    Carolina; Paul K. Sun, Jr., ELLIS & WINTERS, LLP, Raleigh, North
    Carolina, for Appellant.
    Unpublished opinions are not binding precedent in this circuit.
    2
    DAVIS, District Judge:
    In this product liability diversity case, James Paul Pugh,
    III (“Pugh”) alleged that a ladder manufactured by Louisville
    Ladder,   Inc.,   (“LL”)       structurally     failed    during     normal    use,
    causing   Pugh    to    fall    and   suffer    injuries.       At    trial,      two
    engineering experts testified on behalf of Pugh and the jury
    returned a verdict in Pugh’s favor.             LL filed the instant appeal
    arguing   that    the    district     court    abused    its   discretion      with
    respect   to   three     evidentiary    rulings.         Finding     no   abuse    of
    discretion, we affirm.
    I.
    A.
    Excluding the few seconds during which Pugh fell from his
    ladder, the facts are undisputed.              Pugh purchased an eight-foot
    LL ladder from Home Depot in March of 2003.                    The ladder was
    manufactured in Mexico in July of 2002 and had a “load capacity”
    of 225 pounds.          Pugh read all of the warnings on the ladder
    label and the ladder showed no visible signs of damage at the
    time of purchase or at the time of use.                  After purchasing the
    ladder in March of 2003, Pugh hung it on hooks in his garage
    where it remained until July 10, 2003, when he used it for the
    first time.
    On July 10, 2003, Pugh placed the ladder on his living room
    floor in order to install a skylight shade.                 At the time, Pugh
    3
    weighed 215 pounds and was carrying less than 10 pounds of tools
    while using the ladder.           Pugh went up and down the ladder twice
    without incident.         On Pugh’s third trip up the ladder, he fell
    while standing on the ladder’s sixth step.                         Pugh has no memory
    of the actual fall, but recalls later realizing that he was
    lying on the ground.           When Pugh realized that he had fallen, he
    was dazed and disoriented and felt pain in his head, neck, and
    shoulders.        Pugh   was     taken     to    the       emergency    room       and   was
    diagnosed with muscle strain and a concussion.
    After    Pugh’s        fall,     his      ladder          evidenced     extensive
    structural damage.        The worst damage was located on each of the
    side rails, between the first and second steps on the left rail
    and between the second and third steps on the right rail.                            There
    were    also    visible        cracks    around           and    through     the    rivets
    connecting     the    first    three     steps       to    the   side   rails.       After
    Pugh’s ladder was thoroughly photographed and examined, experts
    for both parties agreed upon destructive testing to permit more
    complete examination.           Upon microscopic examination at 1000x and
    2000x    power,       Pugh’s     experts        discovered         “micro-cracks”         at
    locations throughout the ladder, including at step seven, above
    the step being used by Pugh when the accident occurred.
    The primary issue at trial was the manner in which Pugh’s
    accident occurred.            Pugh’s theory was that his ladder had a
    manufacturing        defect    consisting       of    microscopic       cracks      at   the
    4
    ladder’s         rivets    and    that,    during         normal   use,     such    cracks
    propagated          into         larger        cracks         causing       catastrophic
    failure/buckling that resulted in Pugh’s fall.                             In contrast,
    LL’s theory was that the ladder was not defective and did not
    fail,      but    that    Pugh    tipped       the    ladder    during     use     and   the
    ladder’s     post-accident         severely         damaged    condition     was    caused
    during the accident when Pugh’s body fell onto the ladder.
    B.
    Pugh filed the instant products liability action in North
    Carolina state court against LL and Home Depot.                           The defendants
    removed the action to the United States District Court for the
    Middle District of North Carolina.                        Both defendants moved for
    summary judgment, which was granted with respect to Home Depot
    but denied with respect to LL.                       Prior to trial, LL moved to
    exclude both of Pugh’s proposed expert witnesses.
    On April 28, 2008, the day before trial, the district court
    conducted a lengthy pre-trial motions hearing, and the majority
    of   the    hearing       was    spent    on    LL’s      motion   to   exclude     Pugh’s
    proposed experts: Dr. Ajit Kelkar (“Dr. Kelkar”) and Dr. William
    Craft    (“Dr.      Craft”),      professors         of   mechanical    engineering      at
    North Carolina A&T State University.                      At the pre-trial hearing,
    the court heard testimony from both Drs. Kelkar and Craft as
    well as LL’s expert.             LL conceded that Drs. Kelkar and Craft had
    5
    the education and expertise to testify on the subject at issue
    but challenged the reliability of their opinions.
    At the conclusion of the pre-trial hearing, the district
    court denied LL’s motion to exclude Pugh’s experts.                                       Although
    Drs.       Kelkar    and       Craft    were    permitted         to      testify,       the   court
    granted       a   motion        in     limine    filed      by       LL   restricting          Pugh’s
    experts from testifying about testing performed on an “exemplar
    ladder” with the same LL model number as the accident ladder.
    The     court        excluded          such     testimony            because       the    evidence
    established that LL had sold two differently designed ladders
    under this one model number.                        Because the accident ladder and
    the exemplar ladder had a different design, comparison of the
    specifications            of    one     to    the       other    was      deemed    to    have    no
    relevance. 1
    At    trial,       Dr.    Kelkar       testified         at     length   during         Pugh’s
    case-in-chief regarding his theory of crack propagation leading
    to the catastrophic structural failure of Pugh’s ladder.                                         Dr.
    Craft       did     not    testify       during         Pugh’s       case-in-chief        but    was
    1
    Pugh’s experts were unable to purchase a ladder with the
    same LL model number as the accident ladder since it was
    apparently no longer being sold in stores at the time of the
    lawsuit. By happenstance, Dr. Kelkar located a ladder with the
    same LL model number as the accident ladder at his Temple.
    Pugh’s experts conducted testing on such ladder and discovered
    that its rails were thicker than the accident ladder. However,
    the variation in thickness was not indicative of a defect in the
    accident ladder due to the variation in designs.
    6
    reserved as a rebuttal witness.                      LL objected to Pugh’s decision
    to    reserve    Dr.       Craft,    but   the       district     court     overruled           such
    objection.
    During    LL’s        presentation        of     its     case,      defense     counsel
    attempted to introduce evidence to establish the absence of end-
    user complaints reporting “cracks” on LL ladders with the same
    model number as the accident ladder.                            Pugh objected to such
    proposed    evidence         on     hearsay     grounds        and,    following       a    bench
    conference, the district court excluded such testimony based on
    its unreliability.
    At the conclusion of the case, the jury returned a verdict
    in Pugh’s favor.             LL filed the instant appeal challenging: (1)
    the    denial    of    LL’s       motion   to        exclude    the    testimony       of       Drs.
    Kelkar and Craft; (2) the exclusion of testimony regarding the
    absence    of     end-user          complaints         reporting       “cracking”          of    LL
    ladders with the same model number as Pugh’s ladder; and (3) the
    ruling    permitting          Dr.    Craft      to     be   reserved        as    a   rebuttal
    witness.        LL argues that the cumulative effect of the above
    stated errors denied LL a fair trial.
    II.
    District       courts       have    broad       latitude       in   determining          the
    admissibility         of    evidence,      and       evidentiary       rulings,       including
    Daubert    rulings,         will     not   be    overturned        absent        an   abuse       of
    7
    discretion.     Bryte ex rel. Bryte v. American Household, Inc.,
    
    429 F.3d 469
    , 475 (4th Cir. 2005).           “A district court abuses its
    discretion when it acts arbitrarily or irrationally, fails to
    consider judicially recognized factors constraining its exercise
    of discretion, relies on erroneous factual or legal premises, or
    commits an error of law.”        United States v. Delfino, 
    510 F.3d 468
    , 470 (4th Cir. 2007).       However, even if the district court
    abuses its discretion, such evidentiary ruling “is reversible
    only if it affects a party’s substantial rights.”                 Schultz v.
    Capital Int’l Sec., Inc., 
    466 F.3d 298
    , 310 (4th Cir. 2006); see
    Fed. R. Evid. 103(a).
    A.
    Federal Rule of Evidence (FRE) 702 acts as the guidepost
    for the admissibility of expert testimony.                United States v.
    Wilson,   
    484 F.3d 267
    ,   274-75       (4th   Cir.   2007).    The   rule
    provides:
    If   scientific,   technical,      or  other   specialized
    knowledge will assist the trier of fact to understand
    the evidence or to determine a fact in issue, a
    witness qualified as an expert by knowledge, skill,
    experience,   training,    or    education,  may   testify
    thereto in the form of an opinion or otherwise, if (1)
    the testimony is based upon sufficient facts or data,
    (2)   the   testimony   is    the   product  of   reliable
    principles and methods, and (3) the witness has
    applied the principles and methods reliably to the
    facts of the case.
    Fed. R. Evid. 702.      In considering the admissibility of expert
    testimony, a district court acts as a gatekeeper and must assess
    8
    whether    an    expert’s        proffered         testimony      is   both     sufficiently
    reliable and relevant.                 Kumho Tire Co. v. Carmichael, 
    526 U.S. 137
    , 141 (1999); United States v. Moreland, 
    437 F.3d 424
    , 431
    (4th    Cir.     2006).          The    relevance          and   reliability      of    expert
    testimony       is   examined          through         consideration     of,    among    other
    things: “(1) whether the particular scientific theory ‘can be
    (and    has     been)      tested’;          (2)   whether       the   theory    ‘has     been
    subjected to peer review and publication’; (3) the ‘known or
    potential rate of error’; (4) the ‘existence and maintenance of
    standards       controlling            the     technique's        operation’;      and     (5)
    whether the technique has achieved ‘general acceptance’ in the
    relevant      scientific         or    expert      community.”         United     States    v.
    Crisp, 
    324 F.3d 261
    , 266 (4th Cir. 2003) (quoting Daubert v.
    Merrell Dow Pharms., Inc., 
    509 U.S. 579
    , 593-94 (1993)).
    Although reliability of an expert’s principles and methods,
    as well as the application of the facts to such methods, must be
    examined by the district court, the court “need not determine
    that the proffered expert testimony is irrefutable or certainly
    correct,” since, like all forms of testimony, “expert testimony
    is     subject       to     testing          by        ‘[v]igorous     cross-examination,
    presentation of contrary evidence, and careful instruction on
    the burden of proof.’”                   Moreland, 
    437 F.3d at 431
     (4th Cir.
    2006)     (quoting        Daubert,           
    509 U.S. at 596
    )      (alteration     in
    original);       see      also    Maryland         Casualty      Co.   v.    Therm-O-Disc.,
    9
    Inc., 
    137 F.3d 780
    , 784 (4th Cir. 1998) (noting that “[a]ll
    Daubert demands            is   that     the    trial      judge      make    a    ‘preliminary
    assessment’” of whether the proffered testimony is both reliable
    and     helpful).             Neither    FRE     702      nor    case      law     establish    a
    mechanistic test for determining the reliability of an expert’s
    proffered testimony; on the contrary, “‘the test of reliability
    is flexible’ and ‘the law grants a district court the same broad
    latitude         when    it    decides    how    to    determine        reliability      as    it
    enjoys in respect to its ultimate reliability determination.’”
    Wilson, 
    484 F.3d at 274
     (quoting Kumho Tire Co., 
    526 U.S. at 141-42
    ) (second emphasis added). 2                    Although the district court is
    afforded broad latitude in performing such flexible inquiry, the
    focus       of    the     inquiry       should       be    on    the       “‘principles        and
    methodology’            employed   by    the     expert,        not   on     the    conclusions
    reached.”         Moreland, 
    437 F.3d at 431
     (quoting Daubert, 
    509 U.S. at 594-95
    ) (emphasis added).
    2
    As recognized in Wilson, a district court’s reliability
    determination “does not exist in a vacuum,” and there are
    “meaningful differences in how reliability must be examined with
    respect to expert testimony that is primarily experiential in
    nature as opposed to scientific.”     Wilson, 
    484 F.3d at 274
    .
    Here, it appears that some of Pugh’s experts’ testimony was
    based on post-accident testing and some was “experiential in
    nature.”   For example, Dr. Kelkar testified that, based on his
    years of experience working with NASA, numerous branches of the
    military, and several private companies, he knows that punching
    a hole in any metal in order to install a rivet weakens the
    metal and that crack propagation from rivets in metals is a
    widely accepted phenomenon.
    10
    Here,    LL    argues       both      that   the      district      court    failed   to
    properly perform its role as gatekeeper and that the testimony
    of Pugh’s experts was not based on sufficient facts or data.
    The latter of these arguments focuses on the contention that
    Pugh’s experts failed to apply their “principles and methods
    reliably to the facts of the case.”                      Fed. R. Evid. 702(3).
    1.
    The Court first considers LL’s contention that the district
    court did not properly perform its role as gatekeeper because
    the court purportedly shifted the expert admissibility burden to
    LL.    We begin consideration of this argument by noting that the
    proponent      of     expert       testimony        does     not    have    the    burden    to
    “prove”    anything,         but      must    “come     forward      with    evidence       from
    which the court can determine that the proffered testimony is
    properly admissible.”              Maryland Casualty, 
    137 F.3d at 784
    .
    LL’s burden argument ignores the context of its challenge
    to    Pugh’s    experts         and     is   only     supported      by     the    record    if
    excerpts       from       the     lengthy      Daubert        hearing       are    viewed     in
    isolation.          LL began its argument at the Daubert hearing by
    acknowledging the “many articulations” of the Daubert standard
    and clarifying that the burden to establish the admissibility of
    expert    testimony         was    on     Pugh.         LL   then    argued       that   expert
    testimony should not be admitted if it is based on “assumptions
    or    beliefs,       if    the     witness        has      failed    to     consider      other
    11
    explanations, or if the witness’s theory is easily falsifiable
    with a single counter example.”              (J.A. 452.)       LL stated that the
    reason the testimony should be excluded in this case is that
    “[w]e    have   a    failure   to    test.        We   have    opinions    based    on
    assumptions.        We have failure to consider other explanations,
    and we have an easily falsifiable theory . . . .”                     (Id.)       LL’s
    subsequent argument did not focus on attacking the “principles
    and methodology” employed by Pugh’s experts, but instead focused
    on    why    their     conclusions         were    incorrect,       i.e.    “easily
    falsifiable.”
    During LL’s counsel’s summary of why principles of physics
    would disprove Pugh’s experts’ theory, the court interjected,
    stating:    “You’re     saying      it’s   physically        impossible    [for    the
    buckling] to happen like [Pugh’s experts opine]?” (Id. at 457.)
    Counsel responded: “It is.           Jumping ahead, Your Honor, it didn’t
    happen like that.”         (Id.)      After the court confirmed that LL’s
    “impossibility” claim was being advanced in an effort to exclude
    the     testimony     of   Pugh’s      experts,        the    following    exchange
    occurred:
    LL Counsel: Your Honor, I’m careful to point out, that
    the burden on the Plaintiff is to prove by a
    preponderance of the evidence, that the
    testimony is reliable and that the testimony
    has employed reliable scientific methodology.
    Court:      They don’t have to prove the opinion is
    reliable.
    LL Counsel: They have to prove the reliability of the
    method and contrary wise it’s not the
    12
    Defendant’s burden to prove that the opinion
    is impossible.
    Court:          Well, if you want to exclude it, it seems to
    me, that you need to show me scientifically,
    why that is physically impossible or highly
    unlikely, because if they applied proper
    methodology, and their opinion is wrong,
    isn’t that for the finder of fact to
    determine?
    (J.A. 457-58) (emphasis added).                LL highlights this statement by
    the district court, among others, in an effort to establish that
    the court improperly shifted the burden to LL and/or improperly
    applied an “impossibility” standard.
    After    considering    the    Daubert       hearing       transcript     in    its
    entirety, we find that LL fails to establish that the district
    court     erroneously   shifted     the    burden      of   production     to    LL   or
    otherwise failed to exercise its role as gatekeeper. 3                        Although
    LL    had     referenced     purported          errors      in    Pugh’s      experts’
    methodology prior to the above quoted exchange, LL’s argument
    had   focused    almost    entirely       on     the     contention    that     Pugh’s
    3
    Although LL’s claims of error before this court focus
    solely on the Daubert hearing, we recognize that the district
    court   had  additional   evidence  before  it   supporting  the
    admissibility of Pugh’s experts’ testimony, such as a joint
    affidavit submitted by Drs. Kelkar and Craft with numerous
    exhibits including engineering formulas, published articles, and
    “expert reports” detailing the testing Drs. Kelkar and Craft
    performed in this case.    The fact that the district court had
    such materials prior to the Daubert hearing further explains the
    manner in which the hearing was conducted, i.e. LL was given an
    opportunity to attack Pugh’s prior assertions in support of the
    admissibility of his experts.
    13
    experts’    conclusions      were       readily    falsifiable.        The   district
    court’s statement regarding impossibility/unlikelihood, taken in
    context, appears to be a response to such repeated attacks on
    Pugh’s experts’ conclusions.              Furthermore, a careful examination
    of   the    statement     made     by    the    district     court   regarding     the
    correctness of an expert’s conclusions reveals that the court
    was following this Court’s instruction to focus on the experts’
    “principles and methodology” and not on the conclusions reached.
    Moreland, 
    437 F.3d at 431
    . 4            Tellingly, the court’s statement was
    limited to a situation where a challenged expert had applied
    “proper methodology.”
    Further supporting the above finding, prior to the lunch
    recess     from    the   lengthy    Daubert       hearing,     the   district   court
    attempted     to    redirect     LL’s     focus    for   the    remainder     of   the
    hearing, stating that counsel was continuing to argue that it
    4
    The Supreme Court has recognized that “conclusions and
    methodology are not entirely distinct from one another” and that
    “nothing in either Daubert or the Federal Rules of Evidence
    requires a district court to admit opinion evidence that is
    connected to existing data only by the ipse dixit of the
    expert.” General Elec. Co. v. Joiner, 
    522 U.S. 136
    , 146 (1997).
    Such holding, however, does not shift the focus of the Daubert
    test to experts’ conclusions, but merely clarifies that the
    district court’s broad discretion includes the discretion to
    find that there is “simply too great an analytical gap between
    the data and the opinion proffered.”   
    Id.
       Our recent decision
    in Moreland, decided after Joiner and the 2000 amendments to
    Rule 702, reiterates the fact that the proper focus remains on
    the expert’s “principles and methodologies.” Moreland, 
    437 F.3d at 431
    .
    14
    was “scientifically impossible” for the ladder to fail in the
    manner claimed by Pugh’s experts and that the focus should be on
    the validity of the scientific methods utilized and not on the
    weight of such testimony — which is a question for the jury.
    (J.A. 552-53.)       After the lunch recess, the court again repeated
    its concern, stating:
    But now share with me, if you would, [counsel], where
    you are with regard to scientific methodology.      It
    sounds to me like what you are doing is cross-
    examination with regard to the weight of [Pugh’s
    expert’s] opinion, and not the validity of his opinion
    and, you know, this is not a free deposition or free
    opportunity for cross-examination.
    (J.A. 592-93.)       After a brief exchange that concluded with LL’s
    counsel’s offer to end his questioning the court responded: “If
    you   have   other    questions   that    go   to   the   methodology,   you
    certainly should ask them . . . .”        (Id. at 594.)
    We therefore find that the district court did not impose an
    improper burden on LL nor otherwise abuse its discretion in the
    manner in which it conducted the Daubert hearing.              See Maryland
    Casualty, 
    137 F.3d at 784
     (declining to reverse the district
    court’s   Daubert     ruling   notwithstanding      the   court’s   incorrect
    statement regarding the burden, made at the beginning of the
    Daubert hearing, because “the general process contemplated by
    Daubert took place in the hearing and . . . [the plaintiff]
    squarely bore the burden of production”).
    15
    2.
    LL    next     argues       that     even       if      the   district        court
    appropriately performed its role as gatekeeper, Pugh’s experts
    should not have been permitted to testify because they failed to
    apply their “principles and methods reliably to the facts of the
    case.”      Fed.     R.   Evid.     702(3).           We    acknowledge     that     such
    contention presents a close question.                      However, on such a close
    discretionary ruling we may not substitute our judgment for that
    of the district court.             United States v. MacDonald, 
    688 F.2d 224
    , 228 (4th Cir. 1982).
    Although      Pugh’s    experts’        initial        conclusion,     that     the
    ladder     failed    structurally,        was     based       solely   on    a     visual
    inspection of the post-accident ladder, such experts thereafter
    performed    several      tests   to     support      their    initial      assessment.
    These tests included: (1) testing to rule out a design defect; 5
    (2)   “non-destructive”       testing,        including       labeling,     measuring,
    and photographing the accident ladder; 6 (3) destructive testing,
    whereby    samples     were   cut      from     the    ladder’s     side     rails    and
    5
    Pugh’s experts freely admitted that the accident ladder’s
    design was more than sufficient to support its rated 225 pounds.
    6
    Visible cracks were apparent             on the edge of the rivets and
    were fully propagated through the                flange of the side rails in
    the area where the ladder was                   deformed and Pugh’s experts
    testified that the paths of such                 cracks were consistent with
    structural failure.
    16
    submitted       for     testing    to      a     third-party       facility;    (4)
    fractographic examination of the side rails and rivets using a
    high magnification optical microscope and a scanning electron
    microscope; 7     (5)     using   “standard        engineering      formulas”    to
    determine that fully propagated cracks would have resulted in a
    substantial reduction of the “moment of inertia” of the side
    rails, which would in turn decrease the rails’ load capacity;
    and (6) testing C-shaped sections of aluminum designed to mimic
    the accident ladder’s side rails whereby mock rivet holes were
    drilled, cracks simulated, and the reduced load capacity tested
    -   such   testing      was   videotaped       which   permitted    peer   review. 8
    7
    Dr. Kelkar represented that this was a standard
    engineering   technique   to    identify  pre-failure   fracture
    mechanisms, and Dr. Kelkar’s qualification in the field of
    fracture mechanics went unchallenged by LL. (J.A. 364-65.) In
    1985 Dr. Kelkar obtained his Ph.D. devoted entirely to fracture
    mechanics, particularly in the area of failures due to fractures
    that can be caused by impact.     (Id. at 508.)  Dr. Kelkar has
    worked for NASA, the Air Force, Army, and Navy, and authored
    over 200 publications.    He has also worked on several rivet
    studies and is an engineer for a school bus company for which he
    helped develop a new design aimed at eliminating cracks in
    manufacturing due to the riveting process. (Id. 507-10.)
    8
    According to engineering publications cited by Pugh’s
    experts, (J.A. 364), a hole in a structure acts as a “stress
    riser”   and  cracks   initiate  at   points   of  high   stress
    concentration, such as rivets. Pugh’s experts’ testing revealed
    that micro-cracks existed around the rivet holes on the upper
    side rails of the accident ladder above the step where a load
    had been placed on the ladder by Pugh. Pugh’s experts contended
    that cracks at this location supported their hypothesis that the
    cracks pre-dated the accident since weight applied below such
    step would not cause such cracks. LL’s counsel failed to impugn
    (Continued)
    17
    Based both on their experience and the testing outlined above,
    Pugh’s experts determined that their structural failure theory
    was scientifically supported by the facts of this case and the
    most likely cause of the accident.
    In addition to testing and analysis supporting their crack
    propagation    theory,       Pugh’s     experts        performed        testing    and
    analysis to disprove the opposing theory – impact damage.                         Based
    on their experience, Pugh’s experts testified at the Daubert
    hearing that a blunt object, like a human’s upper torso, falling
    onto an aluminum ladder could not create the buckling damage
    readily observable on the accident ladder.                    See Kumho Tire Co.,
    
    526 U.S. at 156
     (“[N]o one denies that an expert might draw a
    conclusion from a set of observations based on extensive and
    specialized   experience.”).          To     prove     such    conclusion    through
    testing, Pugh’s experts conducted impact testing by dropping a
    mass   weighing     240   pounds,     roughly     in    the     human   form,     on   a
    similar 6 foot aluminum ladder.              Such impact testing, which was
    videotaped    and     thus    subject        to   peer        review,    purportedly
    established   that    the    damage    apparent        on   the   accident      ladder
    could not have been caused by a person falling onto the ladder.
    Cf. Oglesby v. General Motors Corp., 
    190 F.3d 244
    , 250 (4th Cir.
    Pugh’s expert’s reliance on such cited sources at the Daubert
    hearing.
    18
    1999)    (recognizing     deficiencies       in   the    plaintiff’s       expert’s
    testing/analysis     including   the     expert’s       failure      to   “eliminate
    other equally plausible causes” for the failure of the component
    in question).
    Notwithstanding      the   tests    outlined       above,    LL      highlights
    several alleged deficiencies with Pugh’s experts’ conclusions,
    including the experts’ failure to investigate the manufacturing
    process,   failure   to    analyze     the   likelihood       that    micro-cracks
    would propagate based on aluminum’s physical properties, failure
    to perform computer modeling, failure to definitively establish
    whether the micro-cracks pre-dated the accident, and failure to
    advance    direct     proof     that     micro-cracks         occurred       during
    manufacturing. 9     However,    in     light     of    the   testing      that   was
    performed to both support Pugh’s hypothesis and discredit LL’s
    9
    Pugh’s experts consistently reported that due to the
    accident ladder’s severely damaged state it was impossible to
    conclusively determine the precise manner in which it failed,
    but that the testing performed to support their theory and rule
    out LL’s theory established that their theory was the most
    probable scientific explanation.   We are unpersuaded by LL’s
    contention that Dr. Craft admitted that tests could have been
    performed to establish whether any cracks pre-dated the
    accident.   Dr. Kelkar stated that “for this particular ladder”
    he could not “metallurgically or microscopically” put a date on
    the cracks. (J.A. 546.) Dr. Craft’s later statement, that “it
    might be possible under certain conditions” to date a crack
    based on chemical or dirt infiltration, merely acknowledges the
    possibility of such testing under hypothetical facts and does
    not appear to be a concession that such tests were viable on
    these facts. (J.A. 596-97.)
    19
    hypothesis, and the lack of evidence suggesting that any of such
    testing was unreliable, the alleged failure of Pugh’s experts to
    perform additional testing goes more to the weight of the expert
    testimony than to its Daubert admissibility.               See Westberry v.
    Gislaved Gummi AB, 
    178 F.3d 257
    , 265 (4th Cir. 1999) (indicating
    that alternative causes for a medical diagnosis advanced by a
    defendant go to the weight of a medical expert’s opinion, not
    its   admissibility,      as   long   as   the    plaintiff’s    expert   took
    “serious account of other potential causes” in formulating a
    diagnosis); Schmude v. Tricam Indus., 
    556 F.3d 624
    , 625-26 (7th
    Cir. 2009) (rejecting the defendant’s claim of error regarding
    the   plaintiff’s     expert’s    failure        to   perform   testing   that
    replicated a ladder’s collapse and noting that the defendant
    failed to establish what kind of test would prove whether the
    hypothesized cause for the collapse was correct).
    LL therefore fails to establish that the testing outlined
    above,     along   with   “experiential”     testimony     offered   by   Drs.
    Kelkar and Craft, was not sufficiently relevant, reliable, and
    based on the facts of this case. 10              Accordingly, we decline to
    disturb the district court’s determination, made after a lengthy
    10
    In explaining its Daubert ruling, the district court
    expressly referenced Pugh’s experts’ experiential testimony,
    their testing in support of Pugh’s theory, and their explanation
    as to why impact damage was not supported by the facts of this
    case. (J.A. 610-11.)
    20
    Daubert hearing, that Pugh’s experts were permitted to present
    their opinions to the jury where the weight of such opinions
    would      be     tested     though      “‘[v]igorous          cross-examination,
    presentation of contrary evidence, and careful instruction on
    the   burden     of    proof.’”      Moreland,   
    437 F.3d at 431
       (quoting
    Daubert, 
    509 U.S. at 596
    ).
    B.
    LL next challenges the district court’s ruling excluding
    testimony regarding the absence of end-user complaints reporting
    “cracking” of LL ladders with the same model number as Pugh’s
    ladder.     At trial, a LL safety engineer testified that LL had a
    system in place for documenting and tracking incidents/accidents
    reported    to    LL    by   end    users.      After   establishing       that    LL
    recorded    all       customer     complaints    and    criticisms     about      its
    ladders, the following exchange occurred:
    LL Counsel:   Now, before Mr. Pugh came along with this
    particular claim in the 85,000 ladders that
    you sold of this model, did anyone make any
    kind of claim that the ladder they purchased
    had cracked and was just unable to hold a
    user’s weight?
    Pugh Counsel: Objection.
    Court:        In that fashion, yes.
    LL Counsel:   Did anybody claim that their L2211-08S had
    cracks in it?
    Pugh Counsel: Objection.
    Court:        Approach the bench.
    (J.A. 1418) (emphasis added).
    21
    During       the    bench       conference,       Pugh    immediately        indicated
    that his objection was based on hearsay.                        LL responded by citing
    the hearsay exception set forth in FRE 803(7).                            Such rule states
    that the following evidence is not excluded by the hearsay rule:
    Evidence that a matter is not included in the
    memoranda reports, records, or data compilations, in
    any form, kept in accordance with the provisions of
    [the   business  records   exception  set   forth  in]
    paragraph   (6),   to   prove  the   nonoccurrence  or
    nonexistence of the matter, if the matter was of a
    kind of which a memorandum, report, record, or data
    compilation was regularly made and preserved, unless
    the sources of information or other circumstances
    indicate lack of trustworthiness.
    Fed. R. Evid. 803(7).
    After        hearing         from     both     parties,       the   district        court
    sustained Pugh’s objection to the specific “cracking” question
    posed, not because LL’s business records were deemed to fall
    outside      of    FRE    803,        but   because     the     court     found    that     the
    proffered testimony had “no reliability” based on the phrasing
    of   the    question          asked    to     the    witness.        (J.A.      1439.)      The
    challenged         question           asked     whether        LL    received       customer
    complaints        about       LL   ladders      that    “had    cracked.”         The    court
    concluded         that    a    lay     person        would    simply      not    identify    a
    structural failure, resulting in a post-accident ladder in a
    similar condition to Pugh’s ladder, as a “cracking” failure.
    Applying the deferential abuse of discretion standard, we
    again      conclude      that      overturning         the   district      court’s       ruling
    22
    would invade the broad discretion afforded the district court
    and require this court to substitute its judgment for that of
    the district judge.          FRE 803(7) permits the introduction of the
    absence of a business record to prove the nonoccurrence of an
    event “unless the sources of information or other circumstances
    indicate     lack    of     trustworthiness.”           Fed.     R.     Evid.    803(7)
    (emphasis     added).        While    the   district      court       used     the   word
    “reliability” and not “trustworthiness,” the court’s rationale
    for excluding the testimony was not an abuse of discretion as
    the district court provided adequate justification for finding
    that    “other   circumstances”         rendered    the    proffered          testimony
    untrustworthy.
    Alternatively, even if we found that “unreliability” was an
    insufficient basis to exclude testimony reporting the lack of
    “cracking” complaints, a separate ruling made by the district
    court provides an independent basis for the exclusion of such
    testimony. 11       After    the     district   court     made    the        reliability
    ruling      discussed     above,     the    court   excluded          LL’s    proffered
    testimony     regarding      six   customer     complaints       it    received      that
    were unrelated to “cracking.”              The court excluded such testimony
    regarding these “non-cracking” complaints because LL failed to
    11
    Such independent basis for excluding testimony discussing
    the lack of “cracking” complaints is unchallenged on appeal.
    23
    produce/introduce          as   a   trial        exhibit     the    business    records
    documenting      such   complaints.          The     court    explained      that     such
    testimony would not be permitted in the absence of the documents
    because opposing counsel cannot counter testimony regarding the
    contents of documents he has never seen.                      Although the district
    court’s analysis supporting such ruling focused on the exclusion
    of the six complaints LL actually received, the ruling is broad
    enough to act as an alternative justification to bar testimony
    about     the    cracking       complaints         that     were    purportedly       not
    received.       To clarify, if the failure to produce/introduce the
    pertinent       business    records       barred     testimony       about     what   the
    business    records     actually      stated,       it     surely   barred     testimony
    about what the same records did not state since the only way to
    prove    the    negative—no     cracking         complaints—is      to   consider      the
    contents of the complaints actually received.                       Accordingly, LL’s
    failure     to     introduce        its     business        records      provides       an
    independent justification for excluding testimony discussing the
    lack of “cracking” complaints.
    C.
    LL’s third evidentiary challenge contends that the district
    court erred by permitting Pugh’s second expert, Dr. Craft, to be
    reserved as a rebuttal witness.                   FRE 611(a) states that “[t]he
    court shall exercise reasonable control over the mode and order
    of interrogating witnesses and presenting evidence so as to (1)
    24
    make    the     interrogation           and   presentation        effective          for    the
    ascertainment of the truth, (2) avoid needless consumption of
    time,     and   (3)     protect         witnesses       from    harassment       or        undue
    embarrassment.”          Fed.      R.    Evid.      611(a).       Notwithstanding           the
    court’s       discretion      regarding          witness       order,    “[o]rdinarily,
    rebuttal evidence may be introduced only to counter new facts
    presented in the defendant’s case in chief.”                            Allen v. Prince
    George's County, Md., 
    737 F.2d 1299
    , 1305 (4th Cir. 1984).
    Here, prior to resting, Pugh’s counsel informed the court
    that Pugh intended to reserve Dr. Craft for rebuttal in order to
    speed along the presentation of the evidence.                           No objection to
    such    proposal       was    initially          made     by     LL.         (J.A.     1083.)
    Thereafter,      LL    objected         to    the    reservation        of     Dr.     Craft,
    contending that a rebuttal witness should only be allowed to
    testify as to “things that are surprise or unexpected . . . .”
    (Id. at 1155-56.)            The district court made no immediate ruling
    on such objection, but later overruled the objection, indicating
    that rebuttal would not be limited to surprise evidence.                                   (Id.
    at 1302.)
    Prior to Dr. Craft’s testimony, the district court again
    allowed LL to argue against the reservation of Dr. Craft.                                    The
    court, having reviewed the case law cited by LL, reaffirmed its
    earlier       ruling    and     indicated          that    rebuttal      testimony           was
    appropriate      as    long   as    it    “clarifies,          rebuts   or    explains       or
    25
    disproves or goes to disproving or explaining [or] clarifying
    the testimony of [LL’s witnesses].”                       (Id. at 1399.)            The court
    rejected        LL’s    contention          that      Dr.     Kelkar          already     fully
    challenged LL’s expert’s position during Pugh’s case-in-chief,
    indicating that a plaintiff’s expert “can only anticipate so
    much of what the defense evidence is going to be . . . .”                                  (Id.
    at 1399-400.)
    After reviewing the trial transcript, we find that LL fails
    to establish that the district court abused its broad discretion
    in exercising control over the “mode and order of interrogating
    witnesses.”        Fed. R. Evid. 611(a).                  LL fails to establish that
    precedent        requires      a     district      court      to   limit        rebuttal     to
    surprise evidence – the fact that we have previously held it
    within      a   district      court’s       discretion        to       limit    rebuttal     to
    surprise        evidence      does    not    equate        with    a    requirement        that
    rebuttal must always be limited in such manner.                                 See Hospital
    Bldg. Co. v. Trustees of Rex Hosp., 
    791 F.2d 288
    , 294 (4th Cir.
    1986) (finding no abuse of discretion under the circumstances
    where the district court limited rebuttal to surprise evidence
    in light of the fact that plaintiff took ten weeks to present
    its case-in-chief).            The Court’s decision in Allen, relied on by
    LL,   is    likewise       distinguishable           from    the   instant         case   since
    Allen      involved    the     rejection        of    the    plaintiff’s           attempt   to
    introduce       new    data    on     rebuttal       in     support      of    a   new    trial
    26
    strategy not pursued as part of the plaintiff’s case-in-chief.
    Allen, 
    737 F.2d at 1305
    .               On the facts before this Court, the
    district    court    did   not    abuse      its     discretion     by    declining    to
    limit     rebuttal    evidence         to   a      response    to    LL’s     “surprise”
    testimony, nor did the district court abuse its discretion in
    permitting Dr. Craft to testify for the first time on rebuttal. 12
    III.
    We    conclude    that      the    district       court   did    not     abuse    its
    discretion with respect to any of the challenged evidentiary
    rulings.      Finding      no    abuse       of     discretion,      we     reject    LL’s
    12
    LL also appears to argue, primarily in its reply brief,
    that Dr. Craft’s actual testimony was improper because it was
    non-responsive to LL’s evidence and was merely rehashing what
    should have been previously presented.    However, such objection
    was not preserved below. In rejecting LL’s preemptive challenge
    to the reservation of Dr. Craft, the district court expressly
    invited LL’s counsel to object during Dr. Craft’s testimony if
    Dr. Craft started to “rehash what could have been said earlier .
    . . .”     (Id. at 1399.)    A review of Dr. Craft’s testimony
    reveals that LL’s counsel did not once object to the scope of
    the inquiry during Dr. Craft’s testimony. (Id. at 1525-61.) We
    therefore do not find any error regarding the “responsiveness”
    of the testimony actually elicited as the district court was
    never presented an objection once the scope of Dr. Craft’s
    testimony became clear.    See United States v. Smith, 
    452 F.3d 323
    , 330 (4th Cir. 2006) (recognizing that although motions in
    limine often suffice to preserve objections for appeal, such is
    not the case when “the exact nature” of the error complained of
    cannot be known at the time the motion is decided); United
    States v. Williams, 
    81 F.3d 1321
    , 1325 (4th Cir. 1996) (finding
    a motion in limine insufficient to preserve an objection when
    the motion was not based on the “precise issue” later raised).
    27
    argument    regarding   the   “cumulative   effect”   of   the   alleged
    errors.    Accordingly, we affirm.
    AFFIRMED
    28