Joseph et al v. Unidentified Parties
ORDER AND REASONS - IT IS ORDERED that 75 Plaintiffs' motion to exclude the testimony of Officer Najolia is GRANTED IN PART and DENIED IN PART. Testimony by Defendants' expert, Kerry Najolia, shall be excluded as to any ultimate legal con clusions regarding whether the Gretna police officers' use of force when arresting Decedent on February 7, 2017 was reasonable, excessive, or justified. He shall be allowed to testify relative to other topics in accordance with the instructions set forth herein. Signed by Judge Susie Morgan on 6/7/2021. (sa)
UNITED STATES DISTRICT COURT
EASTERN DISTRICT OF LOUISIANA
KATIE JOSEPH, ET AL.,
JOHN DOE, ET AL.,
SECTION: “E” (4)
ORDER AND REASONS
Before the Court is Plaintiffs’ Motion to Exclude the Testimony of Defendants’
Expert Kerry Najolia.1 Defendants oppose Plaintiffs’ motion.2 Plaintiffs filed a reply3 and
a supplemental memorandum in support,4 and Defendants filed a supplemental
memorandum in opposition.5 For the reasons that follow, Plaintiffs’ motion is
GRANTED IN PART and DENIED IN PART.
The underlying facts of this lawsuit have been outlined in full by the Fifth Circuit,
and the Court need not repeat them here.6 In short, there are four remaining claims in
this lawsuit: (1) a Section 1983 excessive force claim against Officers Martin and Costa;
(2) a state-law battery claim against Officers Martin and Costa; (3) a state-law wrongful
death claim against Officers Martin, Costa, Varisco, Rolland, Verrett, Faison, Vinet,
R. Doc. 75.
R. Doc. 87.
3 R. Doc. 95.
4 R. Doc. 114.
5 R. Doc. 123.
6 Joseph on Behalf of Estate of Joseph v. Bartlett, 981 F.3d 319, 325-28 (5th Cir. 2020); Joseph v. Doe, Civ.
A No. 17-5051, 2019 WL 95467 (E.D. La. Jan. 3, 2019).
Dugas, Morvant, and Thompson; and (4) a state-law survival claim against Officers
Martin, Costa, Varisco, Rolland, Verrett, Faison, Vinet, Dugas, Morvant, and Thompson.7
Rule 702 of the Federal Rules of Evidence governs the admissibility of expert
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.8
The United States Supreme Court’s decision in Daubert v. Merrell Dow Pharmaceuticals,
Inc.,9 provides the analytical framework for determining whether expert testimony is
admissible under Rule 702.
Under Daubert, courts, as “gatekeepers,” are tasked with making a preliminary
assessment of whether expert testimony is both relevant and reliable.10 The party offering
the expert opinion must show by a preponderance of the evidence that the expert’s
testimony is reliable and relevant.11
The reliability of expert testimony “is determined by assessing whether the
reasoning or methodology underlying the testimony is scientifically valid.”12 In Daubert,
the Supreme Court enumerated several non-exclusive factors that courts may consider in
7 There are no claims in this lawsuit against the City of Gretna under Monell v. Department of Social
Services of City of New York in this lawsuit. Plaintiffs voluntarily dismissed their Monell claim on August
6, 2018. R. Doc. 69.
8 FED. R. EVID. 702.
9 509 U.S. 579 (1993).
10 See Pipitone v. Biomatrix, Inc., 288 F.3d 239, 243-44 (citing Daubert, 509 U.S. at 592-93).
11 Mathis v. Exxon Corp., 302 F.3d 448, 459-60 (5th Cir. 2002).
12 Knight v. Kirby Inland Marine Inc., 482 F.3d 347, 352 (5th Cir. 2007); see also Burleson v. Texas Dep’t
of Crim. Just., 393 F.3d 577, 584 (5th Cir. 2004); Bocanegra v. Vicmar Servs., Inc., 320 F.3d 581, 584-85
(5th Cir. 2003).
evaluating the reliability of expert testimony.13 “These factors are (1) whether the expert’s
theory can or has been tested, (2) whether the theory has been subject to peer review and
publication, (3) the known or potential rate of error of a technique or theory when applied,
(4) the existence and maintenance of standards and controls, and (5) the degree to which
the technique or theory has been generally accepted in the scientific community.”14
The Supreme Court has cautioned that the reliability analysis must remain flexible:
the Daubert factors “may or may not be pertinent in assessing reliability, depending on
the nature of the issue, the expert’s particular expertise, and the subject of his
testimony.”15 Thus, “not every Daubert factor will be applicable in every situation . . . and
a court has discretion to consider other factors it deems relevant.”16 The district court is
offered broad latitude in making expert testimony determinations.17
As a general rule, questions relating to the bases and sources of an expert’s opinion
affect the weight of the evidence rather than its admissibility and should be left for the
finder of fact.18 “Unless wholly unreliable, the data on which the expert relies goes to the
weight and not the admissibility of the expert opinion.”19 Thus, “[v]igorous crossexamination, presentation of contrary evidence, and careful instruction on the burden of
proof are the traditional and appropriate means of attacking shaky but admissible
evidence.”20 The Court is not concerned with whether the opinion is correct but whether
Daubert, 509 U.S. at 592-96.
Bocanegra, 320 F.3d at 584-85 (citing Daubert, 509 U.S. at 593-94).
15 Kumho Tire Co., Ltd. v. Carmichael, 526 U.S. 137, 150 (1999).
16 Guy v. Crown Equip. Corp., 394 F.3d 320, 326 (5th Cir. 2004).
17 See, e.g., Kumho Tire, 526 U.S. at 151-53.
18 See Primrose Operating Co. v. Nat’l Am. Ins. Co., 382 F.3d 546, 562 (5th Cir. 2004).
19 Rosiere v. Wood Towing, L.L.C., No. 07-1265, 2009 WL 982659, at *1 (E.D. La. Apr. 8, 2009) (citing
United States v. 14.38 Acres of Land, 80 F.3d 1074, 1077 (5th Cir. 1996)) (emphasis added); Wolfe v.
McNeil-PPC, Inc., No. 07-348, 2011 WL 1673805, at *6 (E.D. Pa. May 4, 2011).
20 Pipitone, 288 F.3d at 250 (quoting Daubert, 509 U.S. at 596) (internal quotation marks omitted).
the preponderance of the evidence establishes that the opinion is reliable.21 “It is the role
of the adversarial system, not the court, to highlight weak evidence.”22
LAW AND ANALYSIS
Defendants have submitted the expert report of Officer Kerry Najolia,23 who
Plaintiffs concede has been qualified as, and has testified as, an expert on police practice,
procedure, training, police officer survival/defensive tactics, police use of force, and
police canines in numerous Louisiana state and federal courts.24 In their motion,
Plaintiffs ask the Court to exclude the expert testimony of Najolia, asserting that (1) his
opinions are improper legal conclusions, and (2) his opinions are improperly based on
disputed facts that Najolia assumed were true.
In Graham v. Connor, the Supreme Court held that “all claims that law
enforcement officers have used excessive force – deadly or not – in the course of an arrest,
investigatory stop, or other ‘seizure’ of a free citizen should be analyzed under the Fourth
Amendment and its ‘reasonableness’ standard . . .”25 The Court elaborated:
Determining whether the force used to effect a particular seizure is
“reasonable” under the Fourth Amendment requires a careful balancing of
“‘the nature and quality of the intrusion on the individual's Fourth
Amendment interests’” against the countervailing governmental interests at
stake. Our Fourth Amendment jurisprudence has long recognized that the
right to make an arrest or investigatory stop necessarily carries with it the
right to use some degree of physical coercion or threat thereof to effect it.
Because “[t]he test of reasonableness under the Fourth Amendment is not
capable of precise definition or mechanical application,” however, its proper
application requires careful attention to the facts and circumstances of each
particular case, including the severity of the crime at issue, whether the
suspect poses an immediate threat to the safety of the officers or others, and
whether he is actively resisting arrest or attempting to evade arrest by flight.
See Johnson v. Arkema, Inc., 685 F.3d 452, 459 (5th Cir. 2012).
Primrose, 382 F.3d at 562.
23 R. Doc. 75-2.
24 Id. at p. 3.
25 490 U.S. 386, 395 (1989).
The “reasonableness” of a particular use of force must be judged from
the perspective of a reasonable officer on the scene, rather than with the
20/20 vision of hindsight.26
“[T]he ‘reasonableness’ inquiry in an excessive force case is an objective one: the question
is whether the officers' actions are ‘objectively reasonable’ in light of the facts and
circumstances confronting them, without regard to their underlying intent or
Najolia’s opinions that are improper legal conclusions will be
Najolia's testimony will be excluded at trial insofar as it relates to the purported
“reasonableness,” “appropriateness,” “excessiveness,” or “justification” of certain officers’
actions when arresting Decedent, Kendole Joseph, on February 7, 2017. To prepare his
expert report, Najolia reviewed numerous materials related to the arrest, including
photographs, videos, deposition transcripts, training documents, several police reports,
discovery responses, the policies of the Gretna Police Department, and other
documents.29 Based on his review of those materials, combined with his experience and
training, Najolia sets forth his view of the facts and expresses several opinions about the
events that occurred on February 7, 2017, including Decedent's arrest.30 Among other
things, Najolia opines that, based on the totality of the circumstances, the force used by
the Gretna police officers who arrested Decedent was “reasonable,” “justified,”
Id. at 396 (citations omitted).
Id. at 397.
28 As an initial matter, Plaintiffs attack Najolia’s report as inaccurate because he failed to disclose (1) all
cases in which he had been retained as an expert, in some of which he was excluded, (2) that he had trained
Officer Martin, and (3) that his list of publications and educational history were deficient or inflated. R.
Doc. 114 at p. 1-3, 7. Najolia’s report and its attachments, while sloppy at best, open his credibility to
question by the jury. Najolia advised that he is now aware that his CV is incorrect. His Rule 26 report
attachments should be amended or the next judge who sees them may consider the inaccuracies intentional
and exclude his testimony because he is perceived as untrustworthy. Fed. R. Evid. 615.
29 R. Doc. 75-2 at pp. 3-4.
30 Id. at pp. 10-15.
“authorized,” “appropriate,” and “not excessive,” due, in part, to Decedent’s “control
resistant [and] aggressive behavior” and his refusal “to comply with officers’ demands.”31
Najolia's opinions regarding whether the force used in the arrest of Decedent was
reasonable, appropriate, justified, or excessive go extend beyond “embracing” ultimate
issues of law and fact32 and instead offer “ultimate legal conclusions,” for which “[t]he
judge is the source of law and the only expert needed by a jury.”33 Although the Fifth
Circuit has explained that Rule 704 “abolished the per se rule against testimony regarding
ultimate issues of fact, ‘courts must remain vigilant against the admission of legal
conclusions, and an expert witness may not substitute for the court in charging the jury
regarding the applicable law.’”34 Testimony that tells the jury what conclusion to reach or
merely states a legal conclusion is not helpful to the jury.35 Whether the officers’ actions
were reasonable or they used excessive force is an ultimate question for the jury to decide
Id. at p. 14.
Fed. R. Evid. 704 (“An opinion is not objectionable just because it embraces an ultimate issue.”); see also
Goodman v. Harris County, 571 F.3d 388, 399 (5th Cir. 2009).
33 Manton v. Strain, No. 09-339, 2010 WL 4364480, at *2 (E.D. La. Oct. 21, 2010) (quoting Bodzin v. City
of Dallas, 768 F.2d 722, 725 (5th Cir. 1985)); see also Hayward v. Landry, No. 02-927, 2006 WL 8432349,
at *1 (M.D. La. Aug. 3, 2006) (explaining that expert testimony on “ultimate questions of law is not favored”
and that “[t]he distinction between ultimate facts and ultimate questions of law is important because
testimony on ultimate factual questions aids the jury in reaching a verdict while testimony which articulates
and applies the relevant law . . . circumvents the jury's decision-making function by telling them how to
decide the case,” and referencing numerous cases where “federal circuits have held that an expert witness
may not give an opinion on ultimate issues of law.” (internal quotations and citations omitted)); Tolan v.
City of Bellaire, No. 09-1324, 2015 WL 12765413, at *3 (S.D. Tex. Aug. 27, 2015) (noting that both sides are
“correct” in arguing that “the other's expert cannot provide opinions on purely legal issues, and precluding
both experts from offering legal conclusion opinions” at trial).
34 Manton, 2010 WL 4364480, at *2 (quoting United States v. Milton, 555 F.2d 1198, 1203 (5th Cir. 1977))
35 See, e.g., Snap-Drape, 98 F.3d at 197–98 (noting that certain expert reports improperly contained legal
conclusions, which “would be of no assistance in making findings of fact”); Metrejean v. REC Marine
Logistics, L.L.C., No. 08-5049, 2009 WL 3062622, at *2 (E.D. La. Sept. 21, 2009) (citing Burkhart v.
Washington Metro. Area Transit Auth., 112 F.3d 1207, 1212 (D.C. Cir. 1997) (“Expert testimony that
consists of legal conclusions cannot properly assist the trier of fact” in understanding evidence or
determining facts in issue.”)).
after they have heard the evidence and this Court has instructed them on the law at the
conclusion of the case.36
A use of force expert may offer testimony regarding police policies and procedures
as well as whether or not specific acts by a defendant comported with those policies or
procedures.37 But the testimony must not cross the borderline long recognized by this
court between a “mere explanation of the expert's analysis of the facts” and a “forbidden
opinion on the ‘ultimate legal issue’” in the case.38 Thus, Najolia may opine on the
standards or practices applicable to the incident involving Decedent, and whether or not
certain standards or practices were met or violated by the conduct of the Gretna police
See Graham, 288 F. Supp. 3d at 730 (excluding defendants’ law enforcement experts’ opinions (a) that
“the Defendant Officers’ use of force was reasonable, necessary, and only to the level of force necessary to
accomplish a legitimate police objective and overcome [Decedent's] violent resistance” and (b) that “any
officer in the same or similar circumstances as [Defendant Officers] could reasonably believe that [his or
her] use of force was reasonable, necessary, and only the level needed and could have acted in the same or
similar manner as [Defendant Officers]” under Fed. R. Evid. 702, Daubert, and Kuhmo, because the experts’
reports were “ridded with legal conclusions concerning ... use of force,” did not “preface [their] conclusions
with the legal standards for . . . use of force,” did not “address whether [they] had sufficient facts to reach
[their] conclusions or discuss procedures or methodologies in the area of policing including those employed
. . . in determining whether the use of force was excessive on a continuum of force,” and accepted “carte
blanche, the Officers’ version of the facts while labeling [Decedent's] version of the vents as merely
‘allegations’ or ‘claims,’ which implies his version is open to challenge, debate, or doubt,” among other
reasons.); see also Renfroe v. Parker, 974 F.3d 594, 598 (5th Cir. 2020) (holding that it is “error to allow
expert testimony on whether an officer used unreasonable force,” and affirming district court's exclusion
on summary judgment of Decedent's expert's report opining that the officer's “use of deadly force . . . was
unnecessary and objectively unreasonable and . . . violated well-established law enforcement use of force
training and standards and was a greater level of force than any other reasonable officer would have used
under the same or similar circumstances . . .”); United States v. Williams, 343 F.3d 423, 435 (5th Cir. 2003)
(finding that district court erred by admitting an officer's testimony about the reasonableness of another
officer's use of force [i.e., shooting] because “Rule 704(a) does not allow a witness to give legal conclusions”
and “[r]easonableness [of an officer's use of force] under the Fourth Amendment or Due Process Clause is
a legal conclusion.” (internal citations omitted)).
37 See, e.g., Champion v. Outlook Nashville, Inc., 380 F.3d 893, 908 (6th Cir. 2004) (finding testimony
about specific police-practice issues, including “the continuum of force employed by officers generally, the
specific training the [defendants] received, and [the expert's] opinion that if the witnesses' testimony is
credited, the [defendants'] actions violated nationally recognized police standards governing excessive
force” was permissible); Kopf v. Skyrm, 993 F.2d 374, 379 (4th Cir. 1993) (finding testimony from use of
force expert regarding prevailing police standard of conduct regarding use of police dogs and slapjacks was
permissible); Samples v. City of Atlanta, 916 F.2d 1548, 1551 (11th Cir. 1990) (finding testimony regarding
prevailing law enforcement standards in discharging a firearm was permissible).
38 United States v. Speer, 30 F.3d 605, 610 (5th Cir. 1994).
officers during the incident.39 Najolia may not testify that the conduct of the Gretna police
officers met or failed to meet the applicable legal standard, such as the “reasonableness”
of the Gretna police officers' use of force against Decedent.40
In their opposition, Defendants assert they are not calling Najolia to offer legal
conclusions as they recognize this is the domain of the fact finder at trial.41 Defendants
represent Najolia will not provide, nor will Defendants elicit, testimony that will cause
Najolia to opine on the reasonableness of Defendants’ actions or whether their actions
constituted excessive force.42 The Court accepts this representation. Najolia is barred
from offering legal conclusions at trial.43 This Order reserves the right to each side to
object at trial to any that question that may elicit a legal conclusion.44
Najolia must testify to the underlying facts, assumptions, and data on
which he relied before expressing his opinions.
Because Najolia has no personal knowledge relative to Decedent's February 7, 2017
arrest, Plaintiffs contend he essentially engages in a credibility determination and appears
to accept, in toto, Defendants’ version of events. One example on which Plaintiffs heavily
rely is Najolia’s repeated characterization of Decedent as an active resister who was
combative and aggressive, striking one of the arresting officers, Officer Martin, several
See infra n. 38.
McBroom v. Payne, 478 F.App’x 196 (5th Cir. 2012); United States v. Williams, 343 F.3d 423, 435 (5th
Cir.), cert. denied, 540 U.S. 1093 (2003).
42 R. Doc. 87 at p. 7; R. Doc. 123 at p. 4.
43 While Plaintiffs did not raise the issue, Nojalia also opined that Decedent’s actions constituted violations
of state criminal law during the incident. R. Doc. 75-2 at p. 13. Such an opinion is a legal conclusion and is
also barred. See Meganathan v. Signal Int'l L.L.C., No. 1:13-CV-497, 2015 WL 11109846, at *9 (E.D. Tex.
June 26, 2015) (“Payne, however, is opining that Signal's conduct was a violation of the law – this is the
very essence of a legal conclusion. While no cause of action hinges on whether Signal complied with OSHA
(which is why Payne's testimony is irrelevant) that does not mean his opinions that certain laws were
violated are not legal conclusions.”).
44 See Harris, 2005 WL 6009992 (M.D. La. April 8, 2005) (disallowing testimony by Kerry Najolia
“concerning the reasonableness of the actions of the police officer in making [an] arrest”); see also Fetty,
2021 WL 510623, at *8 (excluding expert testimony that described actions as “deliberate” or “reasonable”);
Brown v. Strain, Civ. A. No. 09-2813, 2010 WL 3523026, at *2 (E.D. La. Aug. 31, 2010) (same).
times.45 Plaintiffs note that Najolia discounts other testimony, such as that of the store
clerk – trapped behind the counter during the arrest – who testified at her deposition that
she did not see Decedent strike an officer.46 In addition, two other officers also testified
at their depositions that they never saw Decedent strike an officer.47 Apparently after
making his own credibility determinations, Najolia concludes that on February 7, 2017
Decedent actively resisted the officers and
[a]n intense struggle ensued between Mr. Joseph and both Officers (Martin
and Leduff) who were trying to restrain Mr. Joseph with the aid of handcuffs
so he could be detained for further investigation. Mr. Joseph punched
Officer Martin. . .
Mr. Joseph physically resisted those efforts and became more violent
and combative with the officers. Mr. Joseph attacked, then struck Officer
Martin in an attempt to get away. Mr. Joseph grabbed the inside of Officer
Martin’s vest and refused to let go. . .48
Having arrived at these conclusions of fact, Najolia then renders opinions regarding the
ultimate legal issues in the case. Specifically, Najolia concludes that, “based on the totality
of the circumstances, the officers’ use of force was justified, reasonable and in accordance
with policy, procedures, protocols and training.”49
The Court has excluded Najolia’s testimony offering legal conclusions. Plaintiffs
nevertheless are justifiably concerned that Naolia will in his testimony at trial refer to
Decedent as an “active resister.”50 Whether Decedent was actively resisting is relevant to
the objective reasonableness of the force used by the officers.51 “Officers may consider a
suspect's refusal to comply with instructions . . . in assessing whether physical force is
R. Doc. 75-2 at p. 5.
R. Doc. 75-3 at p. 17.
47 R. Doc. 75-4 at p. 53; R. Doc. 75-5 at p. 21.
48 R. Doc. 75-2 at p. 5.
49 Id. at p. 14.
50 R. Doc. 75-1 at pp. 11-12.
51 Graham, 490 U.S. at 396.
needed to effectuate the suspect's compliance.”52 “However, officers must assess not only
the need for force, but also ‘the relationship between the need and the amount of force
used.’”53 Thus, whether the Decedent was resisting arrest is relevant. Najolia may testify
about the resistance offered by Joseph and how that resistance affected whether each
officer’s response was in accordance with accepted police practices, but Najolia may not
refer to Decedent as an “active resister” because that is a legal question for the jury.
Furthermore, his testimony referring to the Decedent as an “active resister” would risk
inappropriate bolstering and undue prejudice.
The “facts and data” language in Rule 702 is broad enough to allow an expert to
rely on hypothetical facts that are supported by the evidence.54 So long as Defendants
introduce sufficient evidence at trial to support their version of the facts (and these facts
are the version of the facts assumed by Najolia), the Defendants may ask Najolia to testify
as to the resistance offered by Decedent during the arrest assuming those facts are true.55
Najolia may not simply regurgitate (or anticipate) factual testimony about the events at
issue. Instead, once the facts necessary for him to render an opinion are in evidence, he
may assume those facts as a hypothetical and give opinion testimony based on the
assumption of those facts.
To ensure expert testimony in this case is helpful to the jury, the Court will exercise
its discretion under Federal Rule of Evidence 705 to require that expert witnesses first
52 Darden v. City of Fort Worth, Tex., 880 F.3d 722, 729 (5th Cir. 2018) (citing Deville v. Marcantel, 567
F.3d 156, 167 (5th Cir. 2009)).
53 Deville, 567 F.3d at 167 (quoting Gomez v. Chandler, 163 F.3d 921, 923 (5th Cir. 1999)).
54 Powers v. Union Pac. R. Co., No. CIV A 907-CV-212-TH, 2009 WL 734707, at *2 (E.D. Tex. Mar. 19,
2009) (citing Fed. R. of Evid. 702 advisory committee notes). Because any hypothetical fact needs to be
supported by the evidence, any expert witness who will respond to such questions need testify after the fact
55 See Estate of Carey v. Hy-Temp Mfg., Inc., 929 F.2d 1229, 1235 n.2 (9th Cir.1991) (“[E]xpert witnesses
may be competent to give opinions based upon hypothetical facts even though a foundation that the expert
has personal knowledge of those facts has not been laid.”).
testify to the underlying facts, assumptions, and data on which they relied before
expressing their opinions.56 This Court is given considerable latitude over the order in
which evidence will be presented to the jury. “[S]afeguards [to minimize ‘unfair’ burden
on cross-examiner] are reinforced by the discretionary power of the judge to require
preliminary disclosure [of facts] in any event.”57 Obviously, the facts or data provided by
expert witnesses must comply with Federal Rule of Evidence 703. It is assumed that
opposing counsel will vigorously cross-examine expert witnesses on the bases for their
opinions, including whether their opinions would change if the trier of fact finds the facts
to be otherwise. Indeed, “the Federal Rules of Evidence deliberately shift the burden to
the cross-examiner to ferret out whatever empirical deficiencies may lurk in the expert
opinion.”58 Plaintiffs may use cross-examination during the introduction of the factual
testimony or during expert witness testimony to test the correctness of whatever facts the
expert assumes as the basis for his opinions. The Court finds this to be the appropriate
remedy for Plaintiffs’ concerns.
Accordingly, Plaintiffs’ motion to exclude the testimony of Officer Najolia59 is
GRANTED IN PART and DENIED IN PART. Testimony by Defendants’ expert, Kerry
Najolia, shall be excluded as to any ultimate legal conclusions regarding whether the
Gretna police officers’ use of force when arresting Decedent on February 7, 2017 was
This will apply to all retained experts who testify at trial. See, e.g., U.S. v. Perocier, 269 F.R.D. 103, 109,
115 (D.P.R. 2009) (finding it is within the court’s discretion “to require an expert to testify to the underlying
facts and data before giving opinion testimony”); United States v. Brien, 59 F.3d 274, 278 (1st Cir 1995);
Univ. of Rhode Island v. A.W. Chesterton Co., 2 F.3d 1200, 1218 (1st Cir. 1993).
57 See Fed. R. Evid. 705 advisory committee's note.
58 Univ. of Rhode Island, 2 F.3d at 1218.
59 R. Doc. 75.
reasonable, excessive, or justified. He shall be allowed to testify relative to other topics in
accordance with the instructions set forth above.60
New Orleans, Louisiana, this 7th day of June, 2021.
UNITED STATES DISTRICT JUDGE
The Court’s ruling that expert witnesses must first testify to the underlying facts, assumptions, and data
on which they relied before expressing their opinions applies to all expert witnesses.
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