Eric M. Friedman

Eric Friedman guides clients through all stages of product liability litigation, particularly working with expert witnesses to present the science behind clients' products. By leaning on his pre-law history as a biochemist, he is able to identify key arguments for and against clients and craft winning strategies for both motion practice and trial.

View the full bio for Eric M. Friedman at the Faegre Drinker website.

Articles by Eric M. Friedman:


Peer Review Can’t Save “Junk Science” from FRE 702 Judicial Gatekeeping – In re: Roundup Court Excludes Expert Whose Opinions Had Been Published in Peer-Reviewed Literature

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When tasked with assessing the admissibility of expert testimony under Federal Rule of Evidence 702, courts often cite the so-called Daubert factors as criteria that guide the inquiry.  Among those factors is “whether the [expert’s] theory or technique has been subjected to peer review and publication.”  Daubert v. Merrell Dow Pharms., Inc., 509 U.S. 579 (1993).  The Daubert Court observed that, although publication “is not a sine qua non of admissibility,” peer review “increases the likelihood that substantive flaws in methodology will be detected.”  But peer review is not coterminous with the Rule 702 inquiry that federal courts are called upon to make, especially with the rise of so-called predatory publishing and journals with relaxed (or absent) peer review processes.  As one court recently observed, “a court can’t wave junk science through the Daubert gate simply because it survived some prepublication peer-review process.”  In re: Roundup Products Liability Litigation, 2024 WL 3074376 (N.D. Cal. June 20, 2024).

In In re: Roundup, the plaintiff claimed to have developed non-Hodgkin’s lymphoma (NHL) as a result of using the defendant’s herbicide.  In support of that claim, he offered a single expert on the issue of whether glyphosate, the active ingredient in the herbicide, can cause NHL in humans.  The expert’s opinions were all contained in two peer-reviewed and published articles that the expert had co-authored.  But only one of the two—a 2019 meta-analysis of six epidemiological studies addressing the link between glyphosate and NHL, which had been published before the expert became involved in the litigation—grappled with the available epidemiological evidence.  The defendant attacked that paper on multiple grounds, and the court agreed that it constituted “junk science” with several flaws each independently justifying its exclusion.

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Northern District of Illinois Holds that Seventh Circuit Precedent is Incompatible with Rule 702 as Amended

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In explaining the December 2023 amendments to Federal Rule of Evidence 702, the Advisory Committee called out several ways in which “many courts” had “incorrectly” applied Rule 702 and failed to adequately discharge their duty as gatekeepers with regard to expert witness testimony.  The import of those comments is that existing precedent on Rule 702 may be “incorrect” and must be re-examined.

A case pending in the Northern District of Illinois serves as a fine illustration of how this re-examination should work in practice.  In West v. Home Depot U.S.A., Inc., 2024 WL 1834112 (N.D. Ill. Apr. 26, 2024), the plaintiff alleged that she was injured when portions of a store display fell on her.  She offered a trio of experts to opine that her claimed injuries had been caused by the incident, but none of them “were aware of, let alone reviewed, [her] highly salient medical history prior to issuing their causation opinions.”  Rather, they were treating physicians who based their opinions solely on their post-incident treatment of the plaintiff.

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Washington Appellate Court Holds Statute of Repose Constitutional and Applicable in All Cases Applying Its Product Liability Act

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Statutes of repose serve as substantive outer limits on product liability claims after a certain time period following the product’s sale or use, potentially providing a complete defense in some jurisdictions and a rebuttable presumption of non-defectiveness in others.  But for a statute of repose to provide a viable defense, it must apply to the case at hand and survive constitutional scrutiny.  A recent appellate decision from Washington State provides good news on both fronts for defendants facing claims brought under the Washington Product Liability Act (WPLA).

In Erickson v. Pharmacia LLC, – P.3d –, 2024 WL 1905209 (Wash. Ct. App. May 1, 2024), three former teachers alleged injury from chemical exposure in middle school buildings built in the 1960s.  In 2018, the teachers filed product liability claims under the WPLA alleging that the chemicals at issue were not reasonably safe as designed and led to various adverse medical effects.  Because the plaintiffs had filed under the WPLA and the defendants did not contest that selection, the WPLA provided the substantive law governing the claims.  When the defendants moved for summary judgment on grounds that the claims were time-barred under the statute of repose contained in the WPLA, the plaintiffs argued that Missouri law (which has no statute of repose for product liability claims) should apply. The plaintiffs pointed to the fact that the chemicals were manufactured in Missouri and the manufacturer also had its principal place of business in Missouri.  The trial court agreed, and the case proceeded to a nine-figure jury verdict in the plaintiffs’ favor.

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Expert’s Results-Driven Methodology Leads to Exclusion and Summary Judgment in Paraquat MDL

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An expert witness is not supposed to pick a desired result and then reverse engineer inputs and methods that reach that result.  As the Ninth Circuit observed 30 years ago, “[c]oming to a firm conclusion first and then doing research to support it is the antithesis of [the scientific] method.”  Claar v. Burlington Northern R.R. Co., 29 F.3d 499, 502-03 (9th Cir. 1994).  A recent opinion from the Southern District of Illinois offers a fine example of an expert with a results-driven approach and a court that called him out on it.

In re Paraquat Products Liability Litigation, 2024 WL 1659687 (S.D. Ill. Apr. 17, 2024), arises from a multidistrict litigation (“MDL”) in which the plaintiffs claim to have developed Parkinson’s disease as a result of exposure to an herbicide, paraquat.  Four plaintiffs whose cases had been chosen for the MDL’s first trials offered a statistician (the parties disputed whether he also qualified as an epidemiologist) as their sole expert to establish general causation.  He had a difficult task, as no peer-reviewed literature established a link between paraquat exposure and Parkinson’s disease.  Indeed, when the court asked the plaintiffs to identify such literature, the plaintiffs could cite only a single opinion article.  That article had been shared with another of the plaintiffs’ experts before it was published, leading the court to conclude in deciding a prior discovery dispute that there was reason to investigate “whether counsel for the MDL plaintiffs, their experts, or other third parties may have influenced the contents of the article for the benefit of one side in the MDL.”  2023 WL 8372819 (S.D. Ill. Dec. 4, 2023).

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Missing the Mark: Summary Judgment Granted Where Plaintiff’s Experts Opine on Defect but Fail to Support Causation

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Product liability claims require proof of causation.  To be sure, they also require proof of some defect in the product and/or its accompanying warnings and product literature.  But defect and causation are separate elements of a prima facie claim, and both must be established – usually, through expert testimony.  As we have discussed on multiple occasions (for example, here and here), a plaintiff’s failure to offer admissible expert testimony on each element can lead to summary judgment.  A recent decision from the Eastern District of Pennsylvania offers yet another illustration.

In Slatowski v. Sig Sauer, Inc., 2024 WL 1078198 (E.D. Pa. Mar. 12, 2024), the plaintiff was an Immigration and Customs Enforcement (“ICE”) officer who was injured when his pistol fired unintentionally during a marksmanship training exercise.  He sued the gun manufacturer, alleging that a design defect in the gun’s integral safety feature – specifically, the lack of a tabbed trigger – caused the firearm to discharge unintentionally. The plaintiff proffered two experts in support of the claim:  a gunsmith and a certified firearms instructor and range safety officer with a Ph.D. in ergonomics.  The defendant moved to exclude both experts’ opinions and also moved for summary judgment, arguing that the plaintiff had no admissible expert testimony to establish causation.

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California Appellate Court Upholds Federal Preemption of Negligent Undertaking Claim Under the Medical Device Amendments of 1976

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Federal preemption can be a very powerful defense.  For example, claims concerning Class III medical devices requiring pre-market approval are generally preempted by the Medical Device Amendments of 1976, 21 U.S.C. § 360c, et seq. (“MDA”).  In Regwan v. Abbott Laboratories, Case No. B319606, 2023 WL 8818748 (Cal. App. 2d Dec. 21, 2023), the California Court of Appeal relied on that principle in holding preempted a negligent failure to warn claim premised on a sales representative’s intraoperative communications and presented as a “negligent undertaking” claim.  This holding continues a California trend that federal law may preempt negligence-based claims regarding Class III PMA medical devices even if they are not presented as traditional design defect or failure to warn claims.

In Regwan, the plaintiff alleged she suffered serious injuries following implantation of a MitraClip that the defendant manufactured.  During the procedure, the saline bag ran dry, causing the plaintiff to allegedly suffer an air embolism and brain injuries.  The plaintiff asserted negligence and products liability causes of action against the defendant after discovering a defendant representative attended the surgery and was allegedly “responsible for the flow of saline.”  The defendant demurred, arguing federal law preempted the plaintiff’s products liability claims.

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