# Addison v. Louisiana Regional Landfill Company

> District Court, E.D. Louisiana · August 12, 2024

URL: https://www.frixlaw.com/law-library/cases/10648394

## Case

- **Court:** District Court, E.D. Louisiana
- **Decided:** August 12, 2024
- **Opinion:** 100trialcourt
- **Cited by:** 0 later opinions in the Frix Law Library

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## Opinion text

UNITED STATES DISTRICT COURT
EASTERN DISTRICT OF LOUISIANA

FREDERICK E. ADDISON, SR., ET AL., CIVIL DOCKET
Plaintiffs

VERSUS NO. 19-11133
c/w 19-14512

LOUISIANA REGIONAL LANDFILL SECTION: “E” (5)
COMPANY, ET AL.,
Defendants

Applies to: Both Cases

ORDER AND REASONS
Before the Court is Plaintiffs’ motion to exclude argument and expert testimony on
issues litigated in the General Causation Hearing (the “Motion in Limine”).1 The
Defendants filed a joint memorandum in opposition.2 Plaintiffs filed a reply.3
BACKGROUND
This case concerns the operation of the Jefferson Parish Landfill in Waggaman,
Louisiana (“JPLF”), and the resulting odors emitted from the JPLF between July 1, 2017,
and December 31, 2019 (the “relevant time period”). Plaintiffs, who are Jefferson Parish
residents, filed several individual lawsuits that were consolidated into a mass action,
Addison v. Louisiana Regional Landfill Co., which includes over 500 individual Plaintiffs
(the “Addison Action”).4 Plaintiffs assert negligence and nuisance claims under Louisiana
state law5 against Defendants: Jefferson Parish, which owns and contracts with others to

1 R. Doc. 554.
2 R. Doc. 598.
3 R. Doc. 610.
4 See generally Second Amended Complaint, R. Doc. 431.
5 See id. at p. 64.
operate the JPLF; Aptim Corporation, which managed the gas and leachate collection
systems of the JPLF from July 2017 to May 2019; and three entities that operated the
JPLF from May 2013 to December 2020: Louisiana Regional Landfill Company;6 Waste
Connections Bayou, Inc.;7 and Waste Connections US, Inc. (collectively, the
“Defendants”).8 Jefferson Parish residents also filed several related class actions, which

were consolidated into one case, Ictech-Bendeck v. Waste Connections Bayou, Inc. (the
“Class Action”).9
On November 5, 2019, the Court issued the first Case Management Order (“CMO”),
proposed by the parties, which established a bifurcated litigation schedule under which
the issue of general causation would be resolved first by the judge in the Addison and
Class Actions.10 The first CMO and CMOs issued subsequently define the issue of “general
causation” as “the determination of whether odors and gases were being emitted by [the
JPLF] during the relevant time period and whether any such odors and gases were capable
of producing the injuries claimed by any one or more of the Plaintiffs in this case.”11 This
definition incorporates three elements: (1) whether odors and gases were emitted by the
JPLF; (2) whether the gases and odors were emitted during the relevant time period; and

(3) whether the emitted odors and gases were capable of producing the injuries claimed
by any one or more of the Plaintiffs.12 The parties consented to the Court serving as trier

6 Louisiana Regional Landfill Company is formerly known as IESI LA Landfill Corporation.
7 Waste Connections Bayou, Inc. is formerly known as Progressive Waste Solutions of LA, Inc.
8 Second Amended Complaint, R. Doc. 431 at pp. 52-53.
9 See R. Doc. 48 (18-7889).
10 R. Doc. 80 at pp. 1-2.
11 See, e.g., id. at p. 2 (First Case Management Order); R. Doc. 202 (Seventh Case Management Order).
12 See R. Doc. 323 at p. 4.
of fact on the issue of general causation for the Addison and Class Actions, and agreed
resolution of the issue would “help narrow the focus of the case and the issues.”13
The Court held a trial on general causation in both the Addison and Class Actions
in early 2022 (the “General Causation Hearing”).14 On November 29, 2022, the Court
issued its Findings of Fact and Conclusions of Law as to General Causation (the “General

Causation Order”),15 determining that: (1) odors and gases were emitted by the JPLF;16
(2) the emissions of gases and odors from the JPLF occurred during the relevant time
period;17 and (3) exposure to the odors and gases emitted by the JPLF at a level of five
parts per billion (“ppb”) for thirty minutes “is sufficient by itself for individuals generally
to be able to smell hydrogen sulfide and for the exposure to cause a reaction,”18 and to
cause certain Allowed Injuries “in the general population.”19 The Court’s Order and
Reasons issued on July 3, 2024 (the “July 3 Order”), clarified the scope of the Court’s
general causation findings with respect to the Allowed Injuries and the relevant time
period.20
Having found that Plaintiffs established general causation for certain Allowed
Injuries, the Court ordered that a trial be conducted with a select number of Addison

Plaintiffs (the “Trial Plaintiffs”).21 The first Addison trial was set to begin on September

13 R. Doc. 202 at pp. 2, 8.
14 R. Docs. 274-278, 286-289.
15 R. Doc. 323.
16 Id. at p. 5.
17 Id. at p. 26.
18 Id. at p. 27.
19 Id. at pp. 35-44.
20 R. Doc. 642 at pp. 4-5 (defining the Allowed Injuries); id. at p. 14 (granting summary judgment on “on
Plaintiffs’ claims for injuries not included in the Allowed Injuries or for damages as a result of those Allowed
Injuries outside the relevant time period of July 1, 2017 through December 31, 2019”).
21 R. Doc. 323 at pp. 44, 46.
5, 2023,22 and has since been continued to begin on August 12, 2024 (the “first Addison
Trial”).23
Plaintiffs timely filed the instant Motion in Limine seeking to preclude Defendants
from offering argument and expert testimony on issues adjudicated in the General
Causation Hearing under the law-of-the-case doctrine and Federal Rule of Evidence 704,

arguing “these facts and issues should be presented to the jury as having been decided.”24
LEGAL STANDARD
I. Motion in Limine Standard
“It is well settled that motions in limine are disfavored.”25 “[T]he purpose of a
motion in limine is to prohibit opposing counsel ‘from mentioning the existence of,
alluding to, or offering evidence on matters so highly prejudicial to the moving party that
a timely motion to strike or an instruction by the court to the jury to disregard the
offending matter cannot overcome its prejudicial influence on the jurors’ mind.’”26
“Evidence is relevant” if “it has any tendency to make a fact . . . of consequence in
determining the action” “more or less probable than it would be without the evidence.”27
“Evidence which is not relevant is not admissible.”28 Under Federal Rule of Evidence 403,

the Court may exclude even relevant evidence “if its probative value is substantially
outweighed by a danger of . . . unfair prejudice.”29 “‘Unfair prejudice’ . . . means an undue
tendency to suggest decision on an improper basis, commonly, though not necessarily, an

22 R. Doc. 340.
23 R. Doc. 495.
24 R. Doc. 554 at p. 2.
25 Auenson v. Lewis, 94-2734, 1996 WL 457258, at *1 (E.D. La. Aug. 12, 1996) (citing Hawthorne Partners
v. AT & T Technologies, Inc., 831 F. Supp. 1398, 1400 (N.D. Ill. 1993)).
26 MGMTL, LLC v. Strategic Tech., 20-2138, 2022 WL 594894, at *2 (E.D. La. Feb. 28, 2022).
27 FED. R. EVID. 401 (emphasis added).
28 FED. R. EVID. 402.
29 FED. R. EVID. 403.
emotional one.”30
“An order in limine excludes only clearly inadmissible evidence; therefore evidence
should not be excluded before trial unless it is clearly inadmissible on all potential
grounds.”31 Instead, courts should reserve evidentiary rulings until trial so that questions
as to the evidence “may be resolved in the proper context.”32 “When ruling on motions in

limine, the Court ‘maintains great discretion [as to] evidentiary determinations.’”33 If the
evidence is not clearly inadmissible on all grounds, it is better for the court to decline to
rule in advance of trial so that it will have the opportunity to resolve issues in context.
II. Federal Rule of Evidence 702 Standard
Rule 702 of the Federal Rules of Evidence governs the admissibility of expert
witness testimony:
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.34
“A district court has considerable discretion to admit or exclude expert testimony under
Rule 702.”35 Testimony from a qualified expert is admissible only if it is both relevant and
reliable.36 Thus, the threshold inquiry is whether the expert witness possesses the

30 Old Chief v. United States, 519 U.S. 172, 180 (1997).
31 Rivera v. Robinson, 464 F. Supp. 3d 847, 853 (E.D. La. 2020) (quoting Auenson, 1996 WL 457258, at
*1)).
32 Auenson, 1996 WL 457258, at *1.
33 Jackson v. State Farm Fire & Cas. Co., 656 F. Supp. 3d 676 (W.D. La. 2023) (quoting Parker v. John W.
Stone Oil Distributors, L.L.C., 18-3666, 2019 WL 5212285, at *2 (E.D. La. Oct. 16, 2019)).
34 FED. R. EVID. 702.
35 In re Pool Products Distribution Market Antitrust Litig., 166 F. Supp. 3d 654, 661 (E.D. La. 2016) (citing
Gen. Elec. Co. v. Joiner, 522 U.S. 136, 138-39 (1997)).
36 Pipitone v. Biomatrix, Inc., 288 F.3d 239, 244 (5th Cir. 2002).
requisite qualifications to render an opinion on particular subject matter.37 The trial court
“must be assured that the proffered witness is qualified to testify by virtue of his
‘knowledge, skill, experience, training, or education.’”38
If the expert’s qualifications are found to be sufficient, the trial court must then
examine whether the expert’s opinion satisfies the reliability and relevance requirements

of Rule 702 to render the opinion admissible.39 The United States Supreme Court’s
decision, Daubert v. Merrell Dow Pharmaceuticals, Inc.,40 “charges trial courts to act as
‘gate-keepers,’ making a ‘preliminary assessment of whether the reasoning or
methodology underlying [expert] testimony is scientifically valid’” under Rule 702,41 and
of whether that reasoning or methodology “can be reliably applied to the facts of the
case.”42 In Daubert, the Supreme Court enumerated several non-exclusive factors that
trial courts may consider in evaluating the reliability of expert testimony, including: “(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.”43 The Supreme Court has cautioned the reliability analysis
must remain flexible—the Daubert factors “may or may not be pertinent in assessing

37 Wagoner v. Exxon Mobil Corp., 813 F. Supp. 2d 771, 798 (E.D. La. 2011). See also Wilson v. Woods, 163
F.3d 935, 937 (5th Cir. 1999) (“A district court should refuse to allow an expert to testify if it finds that the
witness is not qualified to testify in a particular field or a given subject.”).
38 Wilson, 163 F.3d at 937 (quoting FED. R. EVID. 702).
39 United States v. Valencia, 600 F.3d 389, 424 (5th Cir. 2010).
40 509 U.S. 579 (1993).
41 See Pipitone, 288 F.3d at 243–44 (quoting Daubert, 509 U.S. at 592–93).
42 Valencia, 600 F.3d at 423–24; Knight v. Kirby Inland Marine Inc., 482 F.3d 347, 352 (5th Cir. 2007).
See also Burleson v. Texas Dep’t of Criminal Justice, 393 F.3d 577, 584 (5th Cir. 2004); Bocanegra v.
Vicmar Servs., Inc., 320 F.3d 581, 584–85 (5th Cir. 2003).
43 Bocanegra, 320 F.3d at 584–85 (citing Daubert, 509 U.S. at 593–94).
reliability, depending on the nature of the issue, the expert’s particular expertise, and the
subject of his testimony.”44 “[N]ot every Daubert factor will be applicable in every
situation,” thus district courts are offered broad latitude in making expert testimony
determinations and may “consider other factors it deems relevant.”45
“[E]xpert testimony proffered” must be “sufficiently tied to the facts of the case

that it will aid the jury in resolving a factual dispute.”46 This is essentially a relevance
requirement—relevant evidence, including relevant expert testimony, is that which has
“any tendency to make the existence of any fact that is of consequence to the
determination of the action more probable or less probable than it would be without the
evidence.”47 The proponent of expert testimony “need not prove to the judge that the
expert’s testimony is correct, but [] must prove by a preponderance of the evidence that
the testimony is [relevant and] reliable.”48
“A district court's gatekeeper function does not replace the traditional adversary
system or the role of the jury within this system.”49 “Although the jury ultimately decides
the ‘weight’ of the evidence, the judge ensures there is sufficient probative value . . . to
justify submitting the issue in the first instance.”50 Rule 403 also allows the trial court to

“exclude relevant evidence if its probative value is substantially outweighed by a danger
of one or more of the following: unfair prejudice, confusing the issues, misleading the

44 Kumho Tire Co., Ltd. v. Carmichael, 526 U.S. 137, 150 (1999).
45 Guy v. Crown Equip. Corp., 394 F.3d 320, 326 (5th Cir. 2004); Kumho Tire, 526 U.S. at 151–53.
46 Denley v. Hartford Ins. Co. of Midwest, 07-4015, 2008 WL 2951926, at *3 (E.D. La. July 29, 2008) (citing
Daubert, 509 U.S. at 591).
47 Cunningham v. Bienfang, 2002 WL 31553976 (N.D. Tex. Nov. 15, 2002).
48 Moore v. Ashland Chemical Inc., 151 F.3d 269, 276 (5th Cir. 1998); Mathis v. Exxon Corp., 302 F.3d 448,
459–60 (5th Cir. 2002).
49 In re Pool Products, 166 F. Supp. 3d at 661 (citations omitted).
50 Daniel D. Blinka, Expert Testimony and the Relevancy Rule in the Age of Daubert, 90 MARQ. L. REV. 173,
191 (2006).
jury, undue delay, wasting time, or needlessly presenting cumulative evidence.”51 “‘Unfair
prejudice’ . . . means an undue tendency to suggest decision on an improper basis,
commonly, though not necessarily, an emotional one.”52 Because “Rule 403 is meant to
relax the iron rule of relevance, to permit the trial judge to preserve the fairness of the
proceedings by exclusion despite its relevance,” “the application of Rule 403 must be

cautious and sparing.”53 Indeed, as the Fifth Circuit has proclaimed, the “major function”
of Rule 403 “is limited to excluding matter of scant or cumulative probative force, dragged
in by the heels for the sake of its prejudicial effect.”54
“Vigorous cross-examination, presentation of contrary evidence, and careful
instruction on the burden of proof are the traditional and appropriate means of attacking
shaky but admissible evidence.”55 “As a general rule, questions relating to the bases and
sources of an expert’s opinion affect the weight to be assigned that opinion rather than its
admissibility and should be left for the [factfinder’s] consideration.”56 It is “the role of the
adversarial system, not the court, to highlight weak evidence.”57 “Courts break from this
general rule in exceptional circumstances, such as when an expert’s testimony relies on
‘completely unsubstantiated factual assertions.’”58

LAW AND ANALYSIS
In their Motion in Limine, Plaintiffs seek to exclude testimony of defense experts
that contradict the Court’s General Causation Order, arguing such testimony is

51 FED. R. EVID. 403.
52 Old Chief, 519 U.S. at 180.
53 United States v. Thevis, 665 F.2d 616, 633 (5th Cir. 1982).
54 United States v. McRae, 593 F.2d 700, 707 (5th Cir. 1979).
55 Daubert, 509 U.S. at 596; see also United States v. 14.38 Acres of Land, 80 F.3d 1074, 1078 (5th Cir.
1996) (quoting Daubert, 509 U.S. at 596).
56 14.38 Acres of Land, 80 F.3d at 1077.
57 Primrose Operating Co. v. Nat'l Am. Ins. Co., 382 F.3d 546, 563 (5th Cir. 2004).
58 McCrary v. John W. Stone Oil Distrib., L.L.C., 14-880, 2016 WL 760744, at *3 (E.D. La. Feb. 26, 2016)
(citing Hathaway v. Bazany, 507 F.3d 312, 319 n.4 (5th Cir. 2007)).
“prejudicial to the case” and “creates bases for confusion of the issues.”59 Plaintiffs
contend the recent reports of defense experts Dr. Paolo Zannetti, Dr. Bishow Shaha, Mr.
Matthew Stutz, Dr. John Kind, and Dr. Pamela Dalton (collectively, the “Defense
Experts”), “seek to revive challenges to the expert testimony” of several witnesses offered
by the Plaintiffs at the General Causation Hearing.60 Specifically, Plaintiffs claim reports

prepared by the Defense Experts in anticipation of the first Addison Trial now attempt to
challenge several topics that were adjudicated by the Court’s General Causation Order.61
In opposition, the Defendants argue the issues adjudicated by the General
Causation Order consist narrowly of:
The Emission Holding: odors and gases were emitted by JPLF during the
relevant time period, including some emissions of H2S at an average
concentration of 5 ppb over 30 minutes; and

The Capability Holding: exposure to H2S at an average concentration of 5
ppb over 30 minutes is capable of causing [the Allowed Injuries] in the
general population.62

The Defendants represent they intend to use the Defense Experts’ testimony “to challenge
the sufficiency of Plaintiffs’ evidence on specific causation—an issue that involves a
different legal burden and additional evidence that was not part of the first phase of the
case,” rather than to challenge the Court’s holdings.63
“The law-of-the-case doctrine posits that when a court decides upon a rule of law,
that decision should continue to govern the same issue in subsequent stages in the same

59 R. Doc. 544-1 at pp. 3-4.
60 Id. at p. 3.
61 See R. Doc. 554-1.
62 Id. at p. 5 (citing General Causation Order, R. Doc. 323 at p. 46).
63 R. Doc. 598 at p. 4.
case.”64 “Despite its importance, the doctrine ‘is an amorphous concept’ with no ‘precise
requirements,’”65 and may be applied at the court’s discretion.66 Generally, when a court
decides an issue, “that decision should continue to govern the same issues in subsequent
stages of the same case.”67 Nevertheless, the doctrine “applies only to issues that were
actually decided, rather than all questions in the case that might have been decided but

were not.”68 However, “the issues need not have been explicitly decided; the doctrine also
applies to those issues decided by ‘necessary implication.’”69
As affirmed in the Court’s Order and Reasons issued on July 3, 2024, “the issue of
general causation was ‘actually decided’ by the Court’s General Causation Order”70 and
“findings of fact and conclusions of law expressed therein” will not be revisited.71 The
Court will consider the specific challenges to the Defense Experts’ opinions raised by
Plaintiffs’ Motion in Limine in turn.
I. The Defense Experts may not offer testimony that contradicts the
Court’s General Causation Order, which found an exposure to H2S
at an average concentration of 5 ppb over 30 minutes is capable of
causing the Allowed Injuries in the general population.

Plaintiffs first point to several opinions in the Defense Experts’ reports they argue
contradict the Court’s holding that exposure to H2S at an average concentration of 5 ppb

64 Med. Ctr. Pharmacy v. Holder, 634 F.3d 830, 834 (5th Cir. 2011) (quoting United States v. Castillo, 179
F.3d 321, 326 (5th Cir. 1999), rev’d on other grounds by Castillo v. United States, 530 U.S. 120 (2000))
(internal quotation marks omitted).
65 Arizona v. California, 460 U.S. 605, 618 (1983).
66 See United States v. Garza, 624 F. App'x 208, 211 (5th Cir. 2015) (United States v. Agofsky, 516 F.3d
280, 283 (5th Cir. 2008)).
67 Id.
68 Alpha/Omega Ins. Servs. v. Prudential Ins. Co. of Am., 272 F.3d 276, 279 (5th Cir. 2001) (emphasis
added).
69 Id. (quoting In re Felt, 255 F.3d 220, 225 (5th Cir. 2001)).
70 See General Causation Order, R. Doc. 323.
71 R. Doc. 642 at p. 9 (quoting Alpha/Omega Ins. Servs., 272 F.3d at 279).
over 30 minutes is capable of causing the Allowed Injuries in the general population.72
Specifically, the Plaintiffs argue these opinions should be excluded:
1. Dr. Kind’s opinion that “[t]here is insufficient scientific basis for the
[Trial Plaintiffs’] claims that airborne exposure to 5 ppb [H2S] for 30
minutes is capable of causing their claimed nuisance health effects”;73

2. Dr. Zannetti’s opinion that “a more suitable reference level than the 5
ppb selected by [Plaintiffs’ expert] Lape is the H2S air quality standard
of the State of California[,]” which he indicates is 30 ppb for one hour;74
and

3. Dr. Dalton’s opinion that “[t]he Bruvold study, which was cited
by . . . the Court for its decision that 5 ppb is capable of causing nuisance,
claimed that exposure to [H2S] levels from 0.6-5.7 ppb led to
interference with daily living along with health concerns. However, in
my opinion the Bruvold study does not establish that such a level is likely
to cause injuries in the general population, let alone among the 13 Trial
Plaintiffs”;75 and

4. Dr. Dalton’s opinion that “the H2S concentrations modeled by the Trial
Plaintiffs’ experts in this case are not likely to have caused injury to
persons of ordinary sensibilities.”76

Plaintiffs also argue Dr. Dalton’s opinion that “[e]xposure to odors is not likely to cause
the sleep disturbances claimed by certain Trial Plaintiffs”77 contradicts the Court’s ruling
in the General Causation Order that “[e]xposure to an average of 5 ppb of [H2S] over

72 See R. Doc. 554-1 at pp. 4-6.
73 Kind Rep., R. Doc. 550-2 at p. 13. The Court has already excluded Dr. Kind’s testimony on this opinion.
See R. Doc. 711 at pp. 12-14 (deciding “Dr. Kind may not offer testimony related to his opinion that an
average exposure to 5 ppb of H2S over thirty minutes may cause injury to only the most sensitive portion
of the population, including his assertion that the Trial Plaintiffs must demonstrate they are particularly
sensitive with respect to olfactory sensing”).
74 Zannetti Rep., R. Doc. 559-2 at p. 89.
75 Dalton Rep., R. Doc. 542-3 at p. 5. The Court has already excluded Dr. Dalton’s testimony on this opinion.
See R. Doc. 746 at pp. 10-12 (deciding “Dr. Dalton may not offer testimony related to her Opinion No. 1,
that exposure to an average of 5 ppb of H2S for 30 minutes was not likely or not always a nuisance to the
Trial Plaintiffs or that an average exposure to 5 ppb of H2S over 30 minutes may cause injury to only the
most sensitive portion of the population”).
76 Dalton Rep., R. Doc. 542-3 at p. 16.
77 Id. at p. 10. The Court has already excluded Dr. Dalton’s testimony on this opinion. See R. Doc. 746 at pp.
10-12 (deciding “Dr. Dalton may not offer testimony related to her Opinion No. 3, that exposure to odors
was not likely to cause sleep disturbances claimed by certain Trial Plaintiffs”).
thirty minutes is capable of causing sleep disruption in the general population.”78 The
Defendants contend those opinions address “the question of the likelihood of H2S causing
the Trial Plaintiffs’ injuries,” which was not adjudicated by the Court’s General Causation
Order.79
As discussed in the Court’s Orders and Reasons on Plaintiffs’ motions to exclude

testimony of Dr. Kind80 and Dr. Dalton,81 the Court finds that those opinions referenced
above directly contradict the Court’s finding in the General Causation Order that an
exposure to 5 ppb of H2S over 30 minutes is sufficient to cause the Allowed Injuries,
including sleep disturbance, “in the general population.”82 Because the opinions
contravene the law-of-the-case with respect to the Court’s General Causation Order, the
Defense Experts’ testimony related to those opinions will be excluded under the law-of-
the-case doctrine.
II. The Defense Experts may offer testimony rebutting Dr. Schiffman’s
opinions that were not adjudicated in the General Causation Order.

A. Dr. Zannetti will be allowed to offer testimony rebutting Dr.
Schiffman’s opinion on the lingering effect of H2S in the air and the
ability of H2S to accumulate and concentrate in homes and low-
lying areas.

Plaintiffs challenge an opinion of Dr. Zannetti under the law-of-the-case
doctrine.83 The challenged opinion of Dr. Zannetti is a rebuttal of Dr. Schiffman’s opinion
that “H2S lingers in the air for up to 18 hours and accumulates and concentrates in
enclosed and low-lying areas within the home.”84 Plaintiffs claim Dr. Zannetti’s rebuttal

78 R. Doc. 554-1 at p. 7 (citing R. Doc. 323 at p. 38).
79 R. Doc. 598 at p. 11.
80 R. Doc. 711 at pp. 12-14.
81 R. Doc. 746 at pp. 11-12.
82 General Causation Order, R. Doc. 323 at p. 44.
83 R. Doc. 554-1 at pp. 6-7 (citing Zannetti Rep., R. Doc. 550-2 at pp. 102-03).
84 Id. (citing Zannetti Rep., R. Doc. 550-2 at pp. 102-03).
contradicts the Court’s General Causation Order, which purportedly agreed with Dr.
Schiffman’s “findings that [H2S] is heavier than air,” “accumulates in enclosed and low-
lying areas within the home, and can get into air conditioning systems, extending the
duration of the exposure.”85 In opposition, the Defendants contend this issue “is for the
jury to hear the parties’ evidence and assign the appropriate weight.”86

As discussed in the Court’s Order and Reasons on the Defendants’ motion to
exclude testimony of Dr. Schiffman, “[t]his Court has not ruled whether [H2S] odors
lingered inside the[] particular Trial Plaintiffs’ homes.”87 In that Order and Reasons, the
Court also determined: “Defendants may cross-examine Dr. Schiffman on the specifics of
her opinion to the extent they challenge . . . her opinions as to [H2S] accumulation.”88
Because the Court has not actually decided the issue underlying Dr. Zannetti’s opinion as
challenged by the Plaintiffs, Dr. Zannetti will be allowed to offer his rebuttal of Dr.
Schiffman’s opinion with respect to the lingering effect of H2S in the air and the ability of
H2S to accumulate and concentrate in homes and low-lying areas.
B. Dr. Dalton will be allowed to offer testimony rebutting Dr.
Schiffman’s opinion on the effect of repeated exposure to H2S odor
on odor perception.

Plaintiffs challenge a portion of Dr. Dalton’s Opinion No. 2 under the law-of-the-
case doctrine.89 The challenged portion of Dr. Dalton’s Opinion No. 2 is a rebuttal of Dr.
Schiffman’s opinion that “persistent [odors] over several days” would have led to “very
rapid desensitization of the Trial Plaintiffs during the modeled ‘odor events.’”90 Plaintiffs

85 Id. at p. 6 (citing General Causation Order, R. Doc. 323 at p. 34).
86 R. Doc. 598 at p. 17.
87 R. Doc. 745 at p. 12.
88 Id. at p. 14.
89 R. Doc. 554-1 at pp. 8-9 (citing Dalton Rep., R. Doc. 542-3 at p. 9).
90 Id. (citing Dalton Rep., R. Doc. 542-3 at p. 9).
contend “Dr. Dalton wants to relitigate” the Court’s General Causation Order, which
purportedly found H2S odor perception “would get stronger with time and repeated
exposure.”91 In opposition, the Defendants argue “[t]he General Causation Order
incorporates discussion from both Dr. Schiffman and Dr. Dalton regarding how the
intermittent nature of odors relates to issues of sensitivity.”92

Plaintiffs did not establish at the General Causation Hearing that H2S odor
perception is capable of getting stronger with time and repeated exposure and the Court
did not make that finding in the General Causation Order.93 Because the Court has not
actually decided the issue underlying Dr. Dalton’s opinion as challenged by the Plaintiffs,
Dr. Dalton will be allowed to offer her rebuttal of Dr. Schiffman’s opinion with respect to
the effect of repeated exposure to H2S odor on odor perception.
C. Dr. Dalton will be allowed to offer testimony rebutting Dr.
Schiffman’s opinion on the effect of H2S mixed with VOCs on
trigeminal nerve activation.

Plaintiffs challenge Dr. Dalton’s Opinion No. 4 under the law-of-the-case
doctrine.94 Dr. Dalton’s Opinion No. 4 is a rebuttal of Dr. Schiffman’s opinion that H2S
mixed with volatile organic compounds (“VOCs”) resulted in trigeminal nerve
activation.95 Plaintiffs argue Dr. Dalton’s opinion contradicts the Court’s General
Causation Order, which purportedly “made specific findings regarding the mechanism by
which odors activate both the olfactory and trigeminal nerves.”96 In opposition, the

91 Id. at p. 8 (citing General Causation Order, R. Doc. 323 at p. 33).
92 R. Doc. 598 at p. 18 (citing General Causation Order, R. Doc. 323 at pp., 33-34).
93 See General Causation Order, R. Doc. 323.
94 R. Doc. 554-1 at p. 11 (citing Dalton Rep., R. Doc. 542-3 at p. 12).
95 Id. (citing Dalton Rep., R. Doc. 542-3 at p. 12).
96 Id. at p. 9 (citing General Causation Order, R. Doc. 323 at p. 35).
Defendants argue the General Causation Order’s “discussion of trigeminal nerve
activation was not tied to a specific level of H2S exposure” in combination with VOCs.97
As determined in the Court’s Order and Reasons on the Defendants’ motion to
exclude testimony of Dr. Schiffman, “Dr. Schiffman may testify as to her third opinion
concerning VOCs, to the extent the VOC concentrations tend to show that the emissions

of [H2S] causing the Trial Plaintiffs’ damages came from the [JPLF].”98 In that Order and
Reasons, the Court also determined: “Dr. Schiffman will be allowed to testify that the
malodors generated by the [JPLF] have the capacity to cause the Allowed Injuries and
that VOCs may enhance or exacerbate the injuries.”99 Plaintiffs did not establish at the
General Causation Hearing that H2S mixed with VOCs resulted in trigeminal nerve
activation and the Court did not make that finding in the General Causation Order.100
Because the Court has not actually decided the issue underlying Dr. Dalton’s opinion as
challenged by the Plaintiffs, Dr. Dalton will be allowed to offer her rebuttal of Dr.
Schiffman’s opinion with respect to the effect of H2S mixed with VOCs on trigeminal
nerve activation.
III. Mr. Stutz may offer testimony on his H2S emissions estimates from
the JPLF during the relevant time period and his rebuttal of
Plaintiffs’ experts’ opinions on the topic.

Plaintiffs challenge under the law-of-the-case doctrine Mr. Stutz’s rebuttal of
opinions offered by Plaintiffs’ experts Dr. Jaana Pietari and Mr. Jose Sananes.101 Plaintiffs
argue the Defendants should be precluded from challenging the methodologies of those

97 R. Doc. 598 at p. 19 (citing General Causation Order, R. Doc. 323 at p. 36).
98 R. Doc. 745 at p. 16.
99 Id. at p. 19.
100 See General Causation Order, R. Doc. 323.
101 R. Doc. 554-1 at pp. 12-14.
experts because their “testimony was essential for establishing general causation.”102
Plaintiffs claim the Court rejected Mr. Stutz’s rebuttal of Mr. Sananes’ H2S emissions
estimate at the General Causation Hearing,103 contending “had [Mr. Stutz’s challenges to
Mr. Sananes’ H2S emissions estimates] been meritorious, the Court would have rejected
the opinions of the Plaintiffs’ experts and could not have come to the conclusions it did”

in the General Causation Order.104 In opposition, the Defendants argue “Plaintiffs’
argument fails for the simple reason that the Court has not made any prior rulings related
to Dr. Pietari and Mr. Sananes’ opinions,” which could “conceivably prevent” Mr. Stutz
from offering his rebuttal testimony at trial.105
As discussed in the Court’s Order and Reasons on Plaintiffs’ motion to exclude
testimony of Mr. Stutz, the Court’s General Causation Order determined, “that ‘at times
during the relevant time period odors and gases, including hydrogen sulfide, were being
emitted by the Jefferson Parish Landfill in levels of at least 5 ppb of hydrogen sulfide over
thirty minutes.’”106 In that Order and Reasons, the Court also affirmed “the General
Causation Order did not determine particular H2S emission rates for the JPLF during the
relevant time period,” and the Plaintiffs “do not cite any portion of the General Causation

Order in which the Court established an H2S emission rate.”107 Because the Court has not
actually decided the issue underlying Mr. Stutz’s opinion as challenged by the Plaintiffs,
Mr. Stutz will be allowed to offer testimony on H2S emissions estimates from the JPLF

102 Id. at p. 13.
103 Specifically, Plaintiffs challenge Mr. Stutz’s opinions Plaintiffs’ H2S emissions estimates are flawed
because: (a) Plaintiffs’ experts method for determining a radius of influence for use in estimating H2S
emissions is unsupported by industry or regulatory agencies, and (b) Plaintiffs’ experts reliance on the wet
nature of the JPLF leads to an invalid unrepresentative emission estimate for the site. Id. (citing Stutz Rep.,
R. Doc. 558-2 at 37).
104 Id. at p. 14.
105 R. Doc. 598 at pp. 20, 22.
106 R. Doc. 703 at pp. 21-22 (quoting General Causation Order, R. Doc. 323 at p. 44).
107 Id. at p. 22.
during the relevant time period and his rebuttal of Plaintiffs’ experts’ opinions on the
topic.
Accordingly;
CONCLUSION
IT IS ORDERED that Plaintiffs’ motion to exclude argument and expert
testimony on issues litigated in the General Causation Hearing is GRANTED IN PART
AND DENIED.°’ The Defense Experts may not offer testimony that contradicts the
Court’s General Causation Order, which found an exposure to H2S at an average
concentration of 5 ppb over 30 minutes is capable of causing the Allowed Injuries in the
general population. The Defense Experts may offer testimony on issues not adjudicated
in the General Causation Order, including: (1) rebuttal of the opinions of Dr. Schiffman,
as discussed; (2) H2S emissions estimates from the JPLF during the relevant time period;
and (3) rebuttal of Plaintiffs’ experts’ opinions on the topic of H2S emissions estimates
from the JPLF during the relevant time period.
New Orleans, Louisiana, this 11th day of August, 2024.
suse M
SUSIE Mongan
UNITED STATES DISTRICT JUDGE

108 R. Doc. 554.

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Source: Frix Law Library, https://www.frixlaw.com/law-library/cases/10648394. Public record. Not legal advice.