Tardif v. City of New York et al

Filing 509

OPINION AND ORDER: re: 388 MOTION in Limine filed by City of New York. For the foregoing reasons, Defendant's motion to preclude Plaintiff's experts from testifying is GRANTED in part and DENIED in part. The second motion in limin e from Defendant's February 28, 2022 memorandum of law-to bar Plaintiff from presenting a theory of damages premised on traumatic brain injury-is also DENIED for the same reasons. The Clerk of Court is respectfully directed to terminate the pending motion at ECF No. 388. SO ORDERED. (Signed by Judge Kimba M. Wood on 6/17/2022) (ama)

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UNITED STATES DISTRICT COURT
SOUTHERN DISTRICT OF NEW YORK
-------------------------------------------------------X

USDC SDNY
DOCUMENT
ELECTRONICALLY FILED
DOC #: __________________
DATE FILED:
6/17/2022

MARY TARDIF,
Plaintiff,
13-CV-4056 (KMW)

-v-

OPINION & ORDER

CITY OF NEW YORK,
Defendant.
-------------------------------------------------------X
KIMBA M. WOOD, United States District Judge:
Defendant has moved in limine to preclude trial testimony from four expert witnesses
whom Plaintiff Mary Tardif seeks to call. (ECF No. 388.) Those experts include
neuroradiologist Gregory J. Lawler, neurologist Ranga C. Krishna, life care planner Linda
Lajterman, and economist Mark P. Zaporowski. Defendant argues that the proposed testimony
should be excluded as not based upon reliable methodology within the meaning of Rule 702 of
the Federal Rules of Evidence and Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579
(1993). Defendant also contends that the evidence would not be relevant pursuant to Rule 401 of
the Federal Rules of Evidence or helpful pursuant to Rule 702, but does not question the
qualifications of the four experts.
The experts provided written reports and copies of their curricula vitae (CVs). (ECF
Nos. 412-1, 412-2, 412-4, 412-5.) One expert, Dr. Krishna, also provided an Addendum Report
to address criticisms raised by Defendant. (ECF No. 412-3.) Defendant did not depose
Plaintiff’s experts or seek to rebut their conclusions by proffering expert witnesses of its own.
The Court ordered Plaintiff’s experts to submit supplemental affidavits detailing the
methodologies they used and the reliability of those methodologies; Defendant was given an

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opportunity to submit a rebuttal. These submissions are now before the Court. (ECF Nos. 4481, 448-2, 452-1, 457-1, 477.)
Neither party moved to hold a hearing on Daubert issues.
For the following reasons, Defendant’s motion is GRANTED in part and DENIED in
part.

LEGAL STANDARD
The admissibility of expert testimony is determined pursuant to the “liberal standard” of
Rule 702 of the Federal Rules of Evidence. Nimely v. City of New York, 414 F.3d 381, 395 (2d
Cir. 2005). A court’s Rule 702 analysis includes consideration of three factors: (1) the
qualifications of the expert, (2) the reliability of the expert’s methodology, and (3) the
helpfulness of the expert’s proposed testimony to the trier of fact. See id. at 397. “The
proponent of expert testimony carries the burden of establishing its admissibility by a
preponderance of the evidence[.]” Choi v. Tower Rsch. Cap. LLC, 2 F.4th 10, 20 (2d Cir. 2021).
The Court nevertheless begins with the assumption that “a well[-]qualified expert’s testimony is
admissible,” In re Zyprexa Prods. Liab. Litig., 489 F. Supp. 2d 230, 282 (E.D.N.Y. 2007)
(Weinstein, J.), and “exclusion of such testimony is the exception rather than the rule,” Tardif v.
City of New York (“Tardif I”), 344 F. Supp. 3d 579, 596 (S.D.N.Y. 2018) (Wood, J.) (internal
quotation marks omitted).
Despite the relatively permissive standard that Rule 702 establishes for expert testimony,
district judges continue to play an important “gatekeeping role” by “ensuring that an expert’s
testimony both rests on a reliable foundation and is relevant to the task at hand.” Daubert, 509
U.S. at 597. The judge must make sure that an expert witness “employs in the courtroom the

2

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same level of intellectual rigor that characterizes the practice of an expert in the relevant field.”
Kumho Tire Co. v. Carmichael, 526 U.S. 137, 152 (1999).
In determining the reliability of an expert’s methodology, a “district court should
consider the indicia of reliability identified in Rule 702, namely, (1) that the testimony is
grounded on sufficient facts or data; (2) that the testimony is the product of reliable principles
and methods; and (3) that the witness has applied the principles and methods reliably to the facts
of the case.” Amorgianos v. Nat’l R.R. Passenger Corp., 303 F.3d 256, 265 (2d Cir. 2002)
(internal quotation marks omitted). This inquiry is “a flexible one,” Daubert, 509 U.S. at 594,
that may vary substantially depending on the type of expertise in question. The Court in Daubert
provided a non-exclusive list of factors that may be considered, as appropriate: “(1) whether a
theory or technique has been or can be tested; (2) ‘whether the theory or technique has been
subjected to peer review and publication;’ (3) the technique’s ‘known or potential rate of error’
and ‘the existence and maintenance of standards controlling the technique’s operation;’ and (4)
whether a particular technique or theory has gained general acceptance in the relevant [expert]
community.” United States v. Williams, 506 F.3d 151, 160 (2d Cir. 2007) (quoting Daubert, 509
U.S. at 593–94). The Daubert opinion expressed confidence in the ability of the adversary
system to deal with questionable expert testimony, in most instances. See Daubert, 509 U.S. at
596 (“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.”). Still, when “there is simply too great an analytical gap between the data and the
opinion proffered” or an opinion is “connected to existing data only by the ipse dixit of the
expert,” a court may exclude a proffered opinion. Gen. Elec. Co. v. Joiner, 522 U.S. 136, 146
(1997).

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An expert’s testimony must also be helpful, in that “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.” Fed. R. Evid. 702(a). “[T]he district court should not admit testimony that is
‘directed solely to lay matters which a jury is capable of understanding and deciding without the
expert’s help.’” United States v. Mulder, 273 F.3d 91, 101 (2d Cir. 2001) (quoting United States
v. Castillo, 924 F.2d 1227, 1232 (2d Cir. 1991)).
Finally, expert testimony must satisfy Rule 403’s balancing requirement: that the
probative value of evidence not be substantially outweighed by risks such as unfair prejudice or
misleading the jury. See Fed. R. Evid. 403. Expert testimony can be particularly difficult for a
lay juror to evaluate, and thus may have “unique weight . . . in a jury’s deliberations.” Nimely,
414 F.3d at 397. A court must thus scrutinize expert testimony closely for the risk of prejudice.

DISCUSSION
I.

Dr. Gregory J. Lawler
Plaintiff offers Dr. Gregory J. Lawler, M.D. as an expert witness. Dr. Lawler is a board-

certified radiologist and neuroradiologist who earned a medical degree from New York Medical
College and has thirty years of experience in radiology. (Rezvani Decl., Ex. A (“Lawler
Reports”) at 5, 7, ECF No. 412-1.) He is a former Clinical Instructor of Image Guided Spine
Procedures for neuroradiology fellows at Yale Medical School and a co-author of an article in
the peer-reviewed Journal of Magnetic Resonance Imaging. (Id. at 5, 11.)
Dr. Lawler produced two reports describing the results of imaging of Ms. Tardif’s brain.
The first report, written in July 2021, was based on Dr. Lawler’s review of magnetic resonance
imaging (“MRI”) of Ms. Tardif’s brain in July 2021 in comparison with the results of a 2018
MRI. (Id. at 3.) The July 2021 MRI used techniques including diffusion tensor imaging
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(“DTI”). (Id.) Dr. Lawler identified in Ms. Tardif’s right corona radiata 1 a “focal T2 white
matter hyperintensity” (id.), a brain abnormality that “appear[s] as [a] bright signal” on an MRI
scan (Lawler Decl. ¶ 1, ECF No. 452-1). He also reported a “corresponding decreased
[fractional anisotropy] value” to this T2 hyperintensity. (Lawler Reports at 4.) 2 Dr. Lawler
concludes that these findings “likely represent[] a focus of axonal injury/axonal loss after
trauma.” (Id.) 3
Dr. Lawler’s second report added to the set of comparison images three additional MRIs
and two computed tomography (“CT”) scans taken between April 2009 and January 2021. (Id.
at 2.) Dr. Lawler observes that the T2 hyperintensity is evident on a March 24, 2012 MRI of Ms.
Tardif’s brain, taken shortly after the incident with then-Sergeant Giovanni Mattera, but not on
an April 23, 2009 MRI. (Id.) 4
Prior to turning to the Rule 702 analysis, a threshold inquiry is whether the expert
testimony at issue is relevant pursuant to Rule 401. See Amorgianos, 303 F.3d at 265. Dr.
Lawler proposes to testify regarding three opinions: (1) that a T2 hyperintensity and decreased
fractional anisotropy (“FA”) values are evident from review of the July 2021 MRI with DTI;
(2) that a T2 hyperintensity is evident from review of the March 24, 2012 MRI but not from
review of the April 23, 2009 MRI; and (3) that the observed T2 hyperintensity and decreased FA
“Corona radiata” refers to “a fan-shaped mass of white matter fibers passing to and from the cerebral cortex.”
Corona Radiata, Merriam-Webster, https://www merriam-webster.com/dictionary/corona%20radiata (last visited
June 17, 2022).
1

2
Fractional anisotropy (“FA”) “describes the directional coherence of water diffusion” in white matter tissue;
“[a]bnormally low” FA values are considered “to represent alterations of white matter microstructure” consistent
with damage to that part of the brain. M.B. Hulkower et al., A Decade of DTI in Traumatic Brain Injury: 10 Years
and 100 Articles Later, 34 Am. J. Neuroradiology 2064, 2069 (2013).
3
Axons are found in the brain’s white matter. They “extend[] from the nerve cells that constitute the grey matter of
the brain” and “are organized into thick, tubular tracts” that connect different regions of the brain. (Krishna Decl. at
2, ECF No. 457-1.)

Hereafter, the Court and the parties will refer to Mattera with the title “Sergeant,” which he held at the time of the
incident.

4

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values “likely represent[] a focus of axonal injury/axonal loss” after head trauma. (Lawler
Reports at 2–4.)
Testimony to these three points is relevant—if credited, it would make more or less
probable facts that are of consequence in determining this action. See Fed. R. Evid. 401. Dr.
Lawler’s observations of a T2 hyperintensity and decreased FA values, as well as his conclusion
that these findings are likely signs of axonal loss—when explained by an expert—are relevant to
the existence and severity of the alleged injury to Ms. Tardif’s brain. If the jury finds that the
incident with Sergeant Mattera caused Ms. Tardif to suffer a brain injury, the nature of the injury
would bear on the objective reasonableness of Mattera’s use of physical force and would be
central to a damages calculation. See Centeno v. City of New York, No. 16-CV-2393, 2019 WL
1382093, at *4, *9 (S.D.N.Y. Mar. 27, 2019) (Broderick, J.) (citing Kingsley v. Hendrickson, 576
U.S. 389, 397 (2015)). Dr. Lawler’s determination that a T2 hyperintensity was evident on the
post-incident MRI in 2012 but not in 2009 could also provide some support for the jury to infer a
causal link between the incident with Sergeant Mattera and damage to Ms. Tardif’s brain.
A. Reliability
Defendant argues that Dr. Lawler did not use reliable methodologies when developing his
report and proposed testimony. Defendant contends that Dr. Lawler (1) “does [not] explain how
he arrived at his conclusions from the underlying data” and (2) does not “address[] any other
potential cause of [Ms. Tardif’s] injury.” (Def. Mem. Supp. Mots. in Lim. (“Def. Mem.”) at 7, 8,
ECF No. 390.) 5 Neither of those arguments remains applicable following Dr. Lawler’s
supplemental submission.
Defendant also writes that Dr. Lawler did not provide the “results” of the testing he reviewed or the underlying
“data” relating to the July 2021 MRI with DTI. (Def. Mem. at 3, 7.) The meaning of these statements is unclear.
But if Defendant means to imply that Plaintiff did not comply with discovery requests for the specified information,
the time to move to compel discovery has long passed.
5

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First, Dr. Lawler has explained the methodologies by which he arrived at his conclusions.
Dr. Lawler represents that both MRI and MRI with DTI are “highly reliable” and “sensitive” in
identifying T2 white matter hyperintensities. (Lawler Decl. ¶¶ 1–2.) Defendant does not contest
this point—in fact, it submitted an affidavit from a doctor who himself purports to have reviewed
MRI images of Ms. Tardif’s brain to identify T2 hyperintensities, a methodology employed by
Dr. Lawler. (Tsiouris Aff. ¶ 3, ECF No. 477-1.) Defendant argues that this affidavit, prepared
by Dr. Apostolos John Tsiouris, M.D., shows that the proposition that a T2 hyperintensity could
be identified in the 2012 MRI but not the 2009 MRI is a “fallacy.” (Rebuttal at 5, ECF No. 477.)
But this contention is misdirected. The Court’s role is not to determine whether or not an
expert’s ultimate conclusions are correct; it is to assess the principles and methodologies
underlying those conclusions. Amorgianos, 303 F.3d at 266 (citing Daubert, 509 U.S. at 595).
Defendant does not challenge the use of MRI with DTI to determine FA values—which
are one of two components of the images produced with DTI. (Lawler Decl. ¶ 2.) Defendant’s
only critique of Dr. Lawler’s methodology on this point is that he and Dr. Krishna do not
articulate “what is the ‘normal’ from which [P]laintiff’s FA values are deemed to have deviated.”
(Rebuttal at 4.) Dr. Lawler’s report does not specify whether the “decreased” FA values he
identifies in parts of Ms. Tardif’s brain exhibit are low relative to other areas of Tardif’s brain,
typical FA values from corresponding areas of healthy brains, or some other baseline value.
These questions go to the weight of the evidence, and can be pursued through vigorous crossexamination.
Defendant also does not challenge the reliability of using MRI or MRI with DTI to
identify a likely “focus of axonal injury/axonal loss.” (See Rebuttal at 5.) While more
information would have been welcome, the article Dr. Lawler appended to his declaration

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provides support for the use of conventional MRI technology and MRI with DTI to identify
“traumatic axonal injury.” See M.B. Hulkower et al., A Decade of DTI in Traumatic Brain
Injury: 10 Years and 100 Articles Later, 34 Am. J. Neuroradiology 2064, 2064 (2013) (“[G]ross
abnormalities [of white matter] can be identified in some cases of [traumatic axonal injury] by
using CT and conventional MR imaging[.]”); id. at 2064, 2072 (“DTI is uniquely able to probe
[the] microscopic structure [of white matter] and is, therefore, particularly well-suited for the
assessment of [traumatic axonal injury]. . . . In summary, DTI provides a robust measure of
clinically important [traumatic axonal injury.]”).
Dr. Lawler errs, though, to the extent he implies that, by identifying a likely focus of
axonal injury or axonal loss, he has identified “a type of traumatic brain injury.” (Lawler Decl. ¶
1.) The Court does not understand Dr. Lawler to purport to make a diagnosis of TBI. A
diagnosis of TBI requires consideration of several sources of information; a review of imaging,
standing alone, is insufficient. See 1 Bruce H. Stern & Jeffrey A. Brown, Litigating Brain
Injuries § 6:12.40 (perm. ed., rev. vol. 2021) (“No reputable expert should ever rely on diffusion
tensor imaging or any diagnostic test solely to make a diagnosis. A diagnosis of traumatic brain
injury is a clinical diagnosis based on history, review of medical records, clinical examination
and diagnostic testing. Together, utilizing all of these sources, a clinician can then make an
appropriate diagnosis of traumatic brain injury.”). Indeed, Dr. Lawler himself recommends
“clinical correlation . . . with additional testing for TBI.” (Lawler Reports at 2.) To avoid juror
confusion regarding Ms. Tardif’s diagnosis, Dr. Lawler may not testify to the likelihood that
Tardif suffered a traumatic brain injury.
Second, Dr. Lawler’s supplemental submission makes clear that Defendant’s arguments
regarding causation are not applicable to Lawler’s testimony. Defendant faults Dr. Lawler for

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failing to rule out potential causes of Ms. Tardif’s brain injury other than the incident on March
21, 2012 (Def. Mem. at 8–9)—but Lawler never purports to conclude that the cause of her injury
was the incident with Sergeant Mattera or any other specific event. Dr. Lawler also clarified in
his declaration that he did not conclude that Ms. Tardif was likely to have experienced head
trauma. (Lawler Decl. ¶ 4.)
B. Helpfulness
Finally, Defendant argues that Dr. Lawler’s testimony would not be helpful to lay jurors
because he does not establish the cause of Ms. Tardif’s brain injury. The Court holds that, to the
contrary, Dr. Lawler’s testimony would add value for jurors. The jury will likely be shown
images from the MRIs of Ms. Tardif’s brain. Analysis of brain imaging to identify T2
hyperintensities, decreased FA values, and axonal injury is a specialized skill, the type of
“matter[] requiring assistance to the kind of people expected to sit on the jury.” In re Zyprexa,
489 F. Supp. 2d at 283. Dr. Lawler’s testimony will help the jury to understand the evidence and
to use it to decide the factual questions in this case.
Plaintiff has met her burden to show that Dr. Lawler’s testimony would be relevant,
based on reliable methodologies, and helpful to the jury. Dr. Lawler may testify to his opinions
regarding the identification of T2 hyperintensities, decreased FA values, and axonal injury or
axonal loss. To prevent juror confusion, he may not testify to the likelihood that his findings
indicate traumatic brain injury. He also may not testify to the cause of Ms. Tardif’s alleged brain
injury. However, Dr. Lawler may testify based on his general knowledge regarding the types of
medical conditions and incidents that lead to T2 hyperintensities, decreased FA values, or axonal
injury or axonal loss.

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II.

Dr. Ranga C. Krishna
Plaintiff also intends to offer Dr. Ranga C. Krishna, M.D. as an expert witness. Dr.

Krishna has spent twenty-six years in the private practice of neurology and neurophysiology
after attending medical school at K.M.C. Medical College in India and completing his residency
in neurology at Mount Sinai Medical Center in New York. (Rezvani Decl., Ex. B (“Krishna
Report”) at 11, ECF No. 412-2.) He is certified in neurology by the American Board of
Psychiatry and Neurology (id. at 12) and has co-written a case report regarding the use of DTI
for diagnosis of mild traumatic brain injury for a medical journal, Ranga Krishna et al.,
Diagnostic Confirmation of Mild Traumatic Brain Injury by Diffusion Tensor Imaging: A Case
Report, 6 J. Med. Case Reps. 66 (2012).
Dr. Krishna’s expert report contains several opinions to which he may be asked to testify
at trial. First, Dr. Krishna makes a diagnosis that “[Ms. Tardif’s] clinical findings are consistent
with traumatic brain injury.” (Krishna Report at 5.) Second, he states that Ms. Tardif’s past and
current symptoms and injuries are “causally related to the incident on March 21st, 2012” with
Sergeant Mattera. (Id. at 7.) Third, Dr. Krishna gave the prognosis that Ms. Tardif’s injuries are
“serious and permanent in nature,” will result in “permanent partial residual disabilities, pain,
and limitations with significant restriction of motion,” and “will significantly restrict patient’s
working and social activities.” (Id. at 6.) Finally, Dr. Krishna recommends nine types of future
care for Ms. Tardif, from yearly MRIs with DTI to psychologist consultations six times per year;
he also writes that she “will require a home health aide in the future.” (Id.) 6 Dr. Krishna states
that he based his conclusions on (i) Ms. Tardif’s account of her history, including her current

Dr. Krishna’s report also includes statements identifying T2 white matter hyperintensity and corresponding
decreased FA values. A later submission made clear that those statements were based on determinations made by
Dr. Lawler and were not made independently by Dr. Krishna. (See Krishna Decl. at 6, ECF No. 457-1.)

6

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reported symptoms of “headaches, dizziness, nausea, decline in cognitive functioning, [and
finding] bright lights and loud noises [to be] bothersome” (Krishna Decl. at 2, ECF No. 457-1);
(ii) the neurological examination Krishna conducted of Tardif in 2021, which resulted in
“abnormal findings on her mental status examination” including difficulty counting backward by
sevens, difficulty recalling memorized words after five minutes, and difficulty concentrating (id.
at 1); (iii) diagnostic imaging of Tardif’s brain, including MRIs and the MRI with DTI, which
“showed abnormalities” such as a T2 white matter hyperintensity on the post-incident MRIs and
decreased FA values on the 2021 MRI with DTI (id. at 1, 3) 7; and (iv) review of Tardif’s
available medical records (id. at 1).
Turning to the threshold question, relevance, all of Dr. Krishna’s opinions are relevant
pursuant to Rule 401. Ms. Tardif’s alleged traumatic brain injury, the severity of her suffering
from that injury, and the future costs of treatment are central to her theory of damages in this
trial. The causation question—i.e., whether any or all of Ms. Tardif’s alleged injuries can be
attributed to the incident with Sergeant Mattera—will be perhaps the most pivotal finding made
by the jury. If credited, Dr. Krishna’s opinions would tend to make more probable numerous
facts that are critical to the jury’s resolution of these questions.
A. Reliability
i. Diagnosis of Traumatic Brain Injury
Defendant asserts that three of Dr. Krishna’s opinions are not based on reliable
methodologies. First, Defendant attacks the underpinnings of Dr. Krishna’s diagnosis of TBI.
Defendant principally argues that the Court should preclude testimony about the diagnosis

7
Dr. Krishna explicitly refutes Defendant’s claims that he did not personally review the underlying images listed in
his report. (Compare Krishna Decl. ¶ 5, with Reply at 5.)

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because the use of DTI in diagnosing TBI is not a generally accepted methodology. 8 Federal
courts have faced similar challenges to the reliability of DTI for more than a decade. See Ruppel
v. Kucanin, No. 3:08 CV 591, 2011 WL 2470621, at *4–14 (N.D. Ind. June 20, 2011). Judges in
at least twelve judicial districts—including one in this circuit, see Kang v. Romeo, No.
18CV4033ARRSMG, 2020 WL 4738947, at *17 n.33 (E.D.N.Y. Aug. 14, 2020)—have
consistently held the use of DTI to diagnose brain injury to be reliable, helpful, and admissible. 9
Defendant does not identify a single federal court decision to the contrary, nor does Defendant
even acknowledge the vast weight of authority in favor of DTI. 10
Moreover, Defendant appears not to recognize the appropriate legal standard for this
question. Defendant discusses in its Rebuttal solely whether DTI is a “generally accepted”
methodology (see Rebuttal at 1–4), mirroring the language of the restrictive Frye standard that

8
Inexplicably, Defendant professed bewilderment in its briefing about Drs. Lawler and Krishna having conducted
“something referred to as ‘DTI’” and claimed that the term “is not explained anywhere” in the expert reports. (Def.
Mem. at 3.) The phrase “diffusion tensor imaging” was written out in full next to the abbreviation “DTI” in Dr.
Lawler’s July 18, 2021 report, which is appended to Dr. Krishna’s original report. (Krishna Report at 9.)
Nonetheless, the Court has an affirmative obligation to ensure the reliability of any expert testimony, Daubert, 509
U.S. at 589, and it ordered the parties to make further submissions regarding the reliability of the experts’
methodologies (ECF No. 431). For these reasons, the Court will consider Defendant’s arguments regarding DTI
notwithstanding Defendant’s failure to raise those arguments in its initial memorandum of law.

See Gregg v. Covert, No. 4:21-CV-00871, 2021 WL 5140799, at *3 (E.D. Tex. Nov. 4, 2021); Moreno v.
Specialized Bicycle Components, Inc., No. 19-CV-01750-MEH, 2021 WL 5312387, at *3 (D. Colo. Oct. 18, 2021);
Amidon v. Goodyear Tire & Rubber Co., No. 1:18-CV-02138, 2021 WL 7907073, at *4 (M.D. Pa. Sept. 3, 2021);
Freteluco v. Smith’s Food & Drug Centers, Inc., No. 219CV00759JCMEJY, 2021 WL 183321, at *8 (D. Nev. Jan.
19, 2021); Lance Meadors v. D’Agostino, No. CV 18-01007-BAJ-EWD, 2020 WL 6342637, at *4 (M.D. La. Oct.
29, 2020); Kang v. Romeo, No. 18CV4033ARRSMG, 2020 WL 4738947, at *17 n.33 (E.D.N.Y. Aug. 14, 2020);
Ward v. Carnival Corp., No. 17-24628-CV, 2019 WL 1228063, at *8 (S.D. Fla. Mar. 14, 2019); Barnett v. Nat’l
Cont’l Ins. Co., No. 3:17-CV-153-JWD-EWD, 2019 WL 126732, at *6 (M.D. La. Jan. 8, 2019); Marsh v. Celebrity
Cruises, Inc., No. 1:17-CV-21097-UU, 2017 WL 6987718, at *3 (S.D. Fla. Dec. 15, 2017); Roach v. Hughes, No.
4:13-CV-00136-JHM, 2016 WL 9460306, at *3 (W.D. Ky. Mar. 9, 2016); White v. Deere & Co., No. 13-cv-02173PAB-NYW, 2016 WL 462960, at *4 (D. Colo. Feb. 8, 2016); Andrew v. Patterson Motor Freight, Inc., No.
6:13CV814, 2014 WL 5449732, at *8 (W.D. La. Oct. 23, 2014); Ruppel v. Kucanin, No. 3:08 CV 591, 2011 WL
2470621, at *4–14 (N.D. Ind. June 20, 2011); Booth v. KIT, Inc., No. CIV. 06-1219 JP/KBM, 2009 WL 4544743, at
*2 (D.N.M. Mar. 23, 2009).
9

Multiple courts have stated that a litigant’s failure to acknowledge the consensus of authority in favor of DTI may
implicate that litigant’s duty of candor to the court. See Lance Meadors, 2020 WL 6342637, at *4; Ward, 2019 WL
1228063, at *8.

10

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governs the admissibility of expert testimony in New York state courts, see Sean R. ex rel. Debra
R. v. BMW of N. Am., LLC, 48 N.E.3d 937, 941 (N.Y. 2016). Indeed, the single case to which
Defendant directs the Court is a New York state court case in which the judge issued several
decisions applying the Frye standard. (See Rebuttal at 3–4.) This approach is puzzling, at best.
The U.S. Supreme Court in Daubert explicitly renounced Frye’s “rigid ‘general acceptance’
requirement” and held that this “austere standard, absent from, and incompatible with, the
Federal Rules of Evidence, should not be applied in federal trials.” Daubert, 509 U.S. at 589.
Under the appropriate Daubert standard, Plaintiff has met her burden to establish the
reliability of the methodology Dr. Krishna used to arrive at his diagnosis. The Court looks to the
non-exclusive and non-mandatory factors suggested in Daubert. See Williams, 506 F.3d at 160.
The first two Daubert factors are addressed by the article Drs. Lawler and Krishna shared, a
review of 100 published articles on the use of DTI in relation to TBI. This piece shows that the
methodology has been tested and subject to substantial amounts of peer review and publication.
See Hulkower et al., supra, at 2071. Plaintiff’s submissions, which are no model of
thoroughness, do not address the third Daubert factor: whether the use of DTI to diagnose TBI in
an individual patient has a known error rate and standards to control the technique’s operation.
See Williams, 506 F.3d at 160. However, other courts have established a “consensus view that
DTI . . . has a low error rate.” Lance Meadors v. D’Agostino, No. CV 18-01007-BAJ-EWD,
2020 WL 6342637, at *5 (M.D. La. Oct. 29, 2020). With respect to Daubert’s fourth, general
acceptance factor, Plaintiff’s experts also note that DTI has been approved by the U.S. Food &
Drug Administration, “is a widely available MRI method, and has been in clinical use for many
years.” (Lawler Decl. ¶ 2.) This Court joins the “clear consensus” of its sister courts that have
held expert testimony based on DTI to be admissible. Lance Meadors, 2020 WL 6342637, at *4.

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Defendant’s factual counterarguments are misplaced. Its Rebuttal submission includes
statements of professional organizations that it characterizes as “unequivocally disclaim[ing] the
use of DTI for assessing individual patients.” (Rebuttal at 2.) But in fact, those statements go no
further than stating that there is not sufficient evidence to recommend the “routine clinical use”
of DTI and other types of different advanced neuroimaging techniques. (Rebuttal at 2–3
(emphasis added).) Defendant offers nothing to critique the reliability of DTI in the
circumstances of this case. Nor does Defendant explain why any supposed flaws in DTI should
be interpreted to invalidate the entirety of the methodology used to diagnose Ms. Tardif,
including a review of her history and current symptoms, the results of a neurological
examination, neuroimaging, and medical records.
Defendant fares no better in faulting Dr. Krishna for failing to identify the criteria against
which he measured Ms. Tardif’s symptoms and medical records to make a diagnosis. Dr.
Krishna writes that he made his diagnosis of TBI by applying his “knowledge, training and
experience as a board certified neurologist” to Ms. Tardif’s history, neurological exam,
diagnostic testing, and medical records. (Krishna Decl. at 1.) He represents that this
methodology is “long-established” and “accepted in the medical field in diagnosing and treating
patients.” (Id. at 2.) Courts regularly admit expert testimony from doctors who apply their
training and professional experience to a review of similar sources of information. See Monterey
v. City of New York, No. 17-CV-4477, 2019 WL 5884466, at *5 (S.D.N.Y. Nov. 12, 2019)
(Caproni, J.). Defendant states that Dr. Krishna does not identify the specific “accepted
diagnostic criteria” he applied (Rebuttal at 6), but this concern rings hollow. Defendant did not
submit an affidavit or provide any other authority suggesting that diagnosis of physical brain
injuries is typically guided by the same type of formal diagnostic criteria used to diagnose

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psychological conditions. Cf. Tardif I, 344 F. Supp. 3d at 600 (assessing expert’s diagnosis of
post-traumatic stress disorder using the diagnostic criteria found in the Diagnostic and Statistical
Manual of Mental Disorders). Defendant also chose not to offer an expert in rebuttal.
ii. Causation Opinion
Second, Defendant contends that Dr. Krishna did not use a reliable methodology to draw
a causal link between the incident of March 21, 2012 and Ms. Tardif’s symptoms and injuries,
because he failed to undertake a differential diagnosis. “A differential diagnosis is ‘a patientspecific process of elimination that medical practitioners use to identify the most likely cause of
a set of signs and symptoms from a list of possible causes.’” Ruggiero v. Warner-Lambert Co.,
424 F.3d 249, 254 (2d Cir. 2005) (quoting Hall v. Baxter Healthcare Corp., 947 F. Supp. 1387,
1413 (D. Or. 1996)). For a causation opinion based on a differential diagnosis to be admitted, an
“expert must make some reasonable attempt to eliminate some of the most obvious [alternative]
causes,” but need not “categorically exclude each and every possible alternative cause.” U.S.
Info. Sys., Inc. v. Int’l Bhd. of Elec. Workers, 313 F. Supp. 2d 213, 238 (S.D.N.Y. 2004) (Francis,
M.J.). Defendant argues that Dr. Krishna’s original report did not explicitly rule out several
potential alternative causes of TBI: other incidents between Ms. Tardif and police on March 17,
March 21, and April 16, 2012; a 2019 seizure that caused Tardif to fall and reportedly hit her
head; a mild concussion Tardif suffered in 2020 from being hit with a surfboard; and her history
of epilepsy and past drug use. (Def. Mem. at 8–9.)
Plaintiff counters that Dr. Krishna conducted an “implicit differential diagnosis” and
ruled out alternative causes as set forth in his Addendum Report. (Pl. Opp’n to Def. Mots. in
Lim. (“Pl. Opp’n”) at 8, ECF No. 411.) 11 He justifiably ruled out some alternative causes. Dr.

Defendant moves to strike Dr. Krishna’s “Addendum Report,” which was submitted alongside Plaintiff’s
opposition brief. (ECF No. 412-3.) Dr. Krishna does not state new opinions in this document or even new bases for

11

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Krishna stated that the type of axonal injury he observed results from “speed increase or
deceleration of the head (skull) which causes disfigurements (stretch and strain) of the cerebrum
substance,” i.e., a blow to the head. (Krishna Decl. at 2.) It was reasonable for Dr. Krishna to
rule out incidents with police officers that did not result in reported head trauma—these incidents
certainly cannot be considered obvious alternative causes of brain injury. Similarly, Defendant
provides no reason to believe that Ms. Tardif’s history of epilepsy and her unspecified past drug
use are plausible causes of TBI, much less obvious alternative causes. Defendant does not
identify any instance of head trauma prior to 2012 due to epilepsy or drug use. Moreover, Dr.
Krishna’s diagnosis was based in part on a review of medical records that discussed Ms. Tardif’s
epilepsy at great length. This fact supports Plaintiff’s contention that Dr. Krishna implicitly
ruled out epilepsy as an alternative cause.
The Court holds that other alternative causes cannot be justifiably ruled out. Dr. Krishna
makes too great an analytical leap in concluding that Ms. Tardif’s current symptoms and TBI
diagnosis cannot be explained by instances of head trauma in 2019 and 2020. See Joiner, 522
U.S. at 146. Dr. Krishna writes that he ruled out these potential causes because they occurred
after March 24, 2012, the date of Ms. Tardif’s first MRI from which the experts identified a T2
white matter hyperintensity. Yet, as Plaintiff herself explained, Dr. Krishna’s diagnosis of TBI
was not based solely upon a review of brain imaging. (Pl. Opp’n at 5.) Dr. Krishna considered
factors including Ms. Tardif’s performance at a neurological examination conducted in 2021,

the opinions he had previously included. This submission is an example of an expert permissibly providing
“evidentiary details . . . in support of opinions already expressed in the expert’s report.” Phoenix Light SF Ltd. v.
Bank of N.Y. Mellon, No. 14-CV-10104, 2019 WL 5957221, at *2 (S.D.N.Y. Nov. 13, 2019) (Caproni, J.).
Furthermore, the Court later ordered Dr. Krishna to submit additional information on topics including the one
addressed in the Addendum Report: the methodology underlying his causation opinion. Defendant’s motion to
strike is denied.

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“significantly restrict [her] working and social activities,” and that they will at some point
require the services of a home health aide. (Krishna Report at 6.) Although these conclusions
may rest on shaky ground, Defendant’s critiques go to the weight of this testimony, not its
admissibility.
Dr. Krishna’s determination that Ms. Tardif’s injuries will be permanent is not
particularly well-supported, but it is not groundless. He writes that he considered Ms. Tardif’s
“long standing symptomatology,” the length of time she has experienced those symptoms despite
past medical interventions, and the “clear change in brain histology as evidenced on the MRI
with [DTI].” (Krishna Decl. at 5.) Dr. Krishna also attached a scholarly article that provides
some support for the proposition that TBI causes progressive deterioration in the white matter of
patients’ brains. See Hulkower et al., supra. While Dr. Krishna’s basis for his opinion may be
thin, his opinion is not “speculative or conjectural or based on assumptions that are so unrealistic
and contradictory as to suggest bad faith.” Restivo v. Hessemann, 846 F.3d 547, 577 (2d Cir.
2017) (quoting Zerega Ave. Realty Corp. v. Hornbeck Offshore Transp., LLC, 571 F.3d 206, 214
(2d Cir. 2009)). Defendant does not offer an expert’s contrary opinion or factual submissions
suggesting that it is implausible to conclude from Ms. Tardif’s history, records, and brain
imaging that her condition is likely to be permanent. Defendant’s submissions largely complain
of purported insufficiencies in the record. The “liberal admissibility standards of the federal
rules . . . recognize[] that our adversary system provides the necessary tools for challenging
reliable, albeit debatable, expert testimony.” Amorgianos, 303 F.3d at 267. “[T]he rejection of
expert testimony is the exception rather than the rule.” Fed. R. Evid. 702 advisory committee’s
note to 2000 amendments. The Court need not take the exceptional path in this case.

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Dr. Krishna’s opinion on the severity of Ms. Tardif’s injuries is also admissible. Notably,
Dr. Krishna’s recommendations for the care Ms. Tardif should receive currently are
unchallenged. Treatment for neurological issues is, of course, at the core of the practice of a
treating neurologist such as Dr. Krishna. Cf. id. (citing “[w]hether the field of expertise claimed
by the expert is known to reach reliable results for the type of opinion the expert would give” as
a factor bearing on the reliability of an expert’s opinion). The medical records reviewed by Dr.
Krishna provide modest support for his opinion that Ms. Tardif experiences professional and
social limitations—including one instance of headaches caused by looking at digital screens that
interfered with her work responsibilities and a series of physical therapy appointments to address
mobility issues. (Rezvani Decl., Ex. F-3 at 68, 396–449, ECF No. 414-2.) 13 Ultimately, though,
this is the frequent case in which “gaps or inconsistencies in the reasoning leading to [the
expert’s] opinion go to the weight of the evidence, not to its admissibility.” Restivo, 846 F.3d at
577 (ellipsis omitted) (alteration in original) (quoting Campbell ex rel. Campbell v. Metro. Prop.
& Cas. Ins. Co., 239 F.3d 179, 186 (2d Cir. 2001)).
As stated previously, though, the Court’s exclusion of Dr. Krishna’s causation opinion
means that he may not testify that any proportion of the care he recommends (or the costs of that
care) is due to the incident on March 21, 2012.
B. Helpfulness
The opinions Dr. Krishna offers will be helpful, given that they deal with matters outside
the competence of a lay juror. His TBI diagnosis is the result of applying specialized experience

13

These records are maintained under seal.

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to a set of data—a core function of an expert witness. 14 Similarly, Dr. Krishna’s testimony about
the types of occurrences that generally can cause a TBI will not “‘undertake[] to tell the jury
what result to reach,’ and thus ‘attempt[] to substitute the expert’s judgment for the jury’s.’”
Nimely, 414 F.3d at 397 (quoting United States v. Duncan, 42 F.3d 97, 101 (2d Cir. 1994)).
Instead, the testimony will simply equip the jury with information it can use to decide which
inferences to draw or not to draw from the facts it hears at trial. Defendant does not contest the
helpfulness of Dr. Krishna’s prognosis and future care recommendations, other than repeating
the point that Plaintiffs’ experts do not establish that the prognosis and need for care were caused
by the incident on March 21, 2012. If the jury finds causation, estimates of the likely costs of
treatment will assist in its consideration of a damages award.
III.

Ms. Linda Lajterman
Plaintiff’s third expert is Linda Lajterman—a “life care planner” who, since 1995, has

owned and operated a series of independent consulting firms specializing in life care planning,
cost projections, and case management. (Rezvani Decl., Ex. D (“Lajterman Report”) at 20, ECF
No. 412-4.) Ms. Lajterman is a registered nurse who earned a post-graduate certificate in
advanced life care planning from the University of Florida and is certified as a life care planner,
disability management specialist, and case manager. (Id. at 19.) Her expert report contains
seven categories of recommended care for Ms. Tardif. Those categories include routine medical
care (specialist visits with neurologists, headache specialists, neuro-ophthalmologists, and neurootologists), diagnostic care (an annual MRI), and future aggressive care (occipital nerve block
procedures every three weeks). The recommendations largely mirror the care recommended by

Of course, parroting the narrative recounted by a patient would not be helpful. See Tardif I, 344 F. Supp. 3d at
602–03. But there is no indication that Plaintiff plans to elicit such testimony. At trial, Defendant may naturally
raise any objections that become necessary.
14

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Dr. Krishna. (See id. at 3–4; Lajterman Decl. at 3, ECF No. 448-1.) Ms. Lajterman also adds
her own recommendations for several types of equipment to mitigate the risk of falling and
recommends that Ms. Tardif receive three hours of in-house homemaker assistance per week.
She provides a cost estimate for each type of care and multiplies those figures by the
recommended annual frequency of care and Ms. Tardif’s life expectancy, to arrive at annual and
lifetime total costs.
Ms. Lajterman’s life care plan is relevant and helpful to the jury notwithstanding that the
Court precluded Dr. Krishna’s opinion on the specific cause of Ms. Tardif’s alleged injuries. If
the jury finds liability and causation, Ms. Lajterman’s recommended care and cost estimates
could inform the jury’s damages calculation. Defendant does not challenge Ms. Lajterman’s
qualifications, and the Court is satisfied that she is qualified to opine on life care planning,
including estimating the costs of care.
Defendant contests the reliability of Ms. Lajterman’s methodology in two respects. 15
First, it states that Ms. Lajterman’s creation of a life care plan without the participation of Ms.
Tardif’s treating physicians is an impermissible deviation from the standards of life care
planning. Defendant provides no authority in support of this proposition. Defendant
mischaracterizes the standards of care for life care planning that Ms. Lajterman provided, when it
argues that these standards require the collaboration of a patient’s treating physicians. (Cf.
Lajterman Decl. at 2–3.) The degree of involvement by Ms. Tardif’s treating physicians in Ms.
Lajterman’s life care planning goes to the weight of the evidence, not its admissibility. See, e.g.,
Burris v. Ethicon, Inc., No. 3:20 CV 1450, 2021 WL 3190747, at *19–20 (N.D. Ohio July 28,

15
The Court’s ruling that Dr. Krishna’s care recommendations are admissible moots another of Defendant’s
arguments: that Ms. Lajterman’s life care plan must be precluded because it is derivative of an inadmissible report.

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2021) (admitting expert testimony regarding a life care plan based on the expert’s review of the
plaintiff’s medical records and of recommendations by an expert urologist who was not the
plaintiff’s treating physician).
Second, Defendant asserts that Ms. Lajterman did not produce a “true” life care plan
because her report “reads as [a] cost estimate rather than a [life care] plan.” (Rebuttal at 7.) The
definition of a life care plan includes the “associated costs” of care; similarly, specifying “the
charges for those services needed by the evaluee” is one of the five goals of a life care plan.
(Lajterman Decl. at 35–36.) Even if Defendant is correct that Ms. Lajterman’s report is a cost
estimate, it does not explain why life care planning methodology is not a reliable basis for
estimating costs. Other courts have faced directly analogous circumstances and admitted cost
estimates by life care planners. See Bayes v. Biomet, Inc., No. 4:13-CV-00800-SRC, 2020 WL
5594059, at *9 (E.D. Mo. Sept. 18, 2020) (“Basically, [Dr.] Lux provided recommendations
regarding Mary’s future medical needs, and [life care planner Aubrey] Corwin provided a
calculation of the associated costs, based on her knowledge, experience, and research.”). For all
of the preceding reasons, the Court denies Defendant’s motion to preclude the testimony of Ms.
Lajterman.
IV.

Prof. Mark P. Zaporowski
Plaintiff’s final proffered expert is Professor Mark P. Zaporowski. Prof. Zaporowski

holds a Ph.D. in economics from the State University of New York at Albany and has taught
economics and finance at Canisius College from 1984 to the present. (Rezvani Decl., Ex. E
(“Zaporowski Report”) at 7, ECF No. 412-5.) His report consists of a straightforward inflation
adjustment of Ms. Lajterman’s estimates of the lifetime costs of care for Ms. Tardif. Prof.
Zaporowski calculated projected rates of future inflation of costs for several categories of
medical care and services, as well as future inflation in the overall economy. He did so by
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reviewing past Consumer Price Index (“CPI”) data reported by the Bureau of Labor Statistics for
the years 2000 to 2020 and adopting the assumption that future growth rates in each category of
costs would match past growth rates. (See Zaporowski Decl. ¶¶ 1–2, ECF No. 448-2.)
Defendant raises unpersuasive arguments against the admissibility of Prof. Zaporowski’s
report. Prof. Zaporowski’s testimony is relevant to this case. If the jury finds liability, and that
the actions of Sergeant Mattera caused Ms. Tardif to suffer an injury that merits future medical
treatment, the jury will be required to determine Tardif’s future medical costs. Awards for future
damages must be adjusted to account for the rate of inflation and the time value of money;
collectively, these two factors are termed the “discount rate.” See Ammar v. United States, 342
F.3d 133, 147 (2d Cir. 2003). Prof. Zaporowski’s report points out that the costs of many types
of medical care and services grow faster than the economy-wide rate of inflation. (Zaporowski
Report at 3.) Testimony to this fact would affect the amount of money a jury could reasonably
expect Ms. Tardif to pay for medical expenses over her lifetime. 16 The Second Circuit has stated
that it is often sensible for parties to stipulate to a particular discount rate, thereby simplifying
the jury’s task. See Oliveri v. Delta S.S. Lines, Inc., 849 F.2d 742, 746, 748 (2d Cir. 1988). The
Court would welcome any such stipulation. But a court may not impose such an agreement upon
the parties. Id. at 748.
Defendant also argues that Plaintiff does not sufficiently explain the reliability of Prof.
Zaporowski’s methodology. Prof. Zaporowski provided the twenty years of past Bureau of
Labor Statistics data that he used to calculate his projections of future inflation rates. He
declares that “[u]sing past rates of growth in CPI series to project future inflation rates is a
The Court notes that neither party appears prepared to offer competent evidence regarding “the interest rate for
virtually risk-free investments” over the relevant time period, i.e., the time value of money. Oliveri v. Delta S.S.
Lines, Inc., 849 F.2d 742, 746 (2d Cir. 1988). This shortcoming would leave the finder of fact without a basis to
determine one of the two components of the discount rate.
16

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generally accepted methodology by economists.” (Zaporowski Decl. ¶ 3.) Moreover, testimony
based on the same methodology has been accepted by other courts against a Daubert challenge.
See Coleman v. Dydula, 139 F. Supp. 2d 388, 391, 394 (W.D.N.Y. 2001). Defendant could have
submitted facts supporting its contention that past inflation rates are not a reliable predictor of
future inflation rates, but it did not do so.
Defendant does not challenge Prof. Zaporowski’s qualifications or the helpfulness of his
expert testimony to the jury. Because none of Defendant’s arguments has merit, its motion to
preclude Prof. Zaporowski’s expert testimony is denied.

CONCLUSION
For the foregoing reasons, Defendant’s motion to preclude Plaintiff’s experts from
testifying is GRANTED in part and DENIED in part. The second motion in limine from
Defendant’s February 28, 2022 memorandum of law—to bar Plaintiff from presenting a theory
of damages premised on traumatic brain injury—is also DENIED for the same reasons.
The Clerk of Court is respectfully directed to terminate the pending motion at ECF No.
388.
SO ORDERED.
Dated: New York, New York
June 17, 2022

/s/ Kimba M. Wood
KIMBA M. WOOD
United States District Judge

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