Causation Archives - Faegre Drinker on Products

Subject: Causation

Third Circuit Confirms Correlation Still Does Not Prove Causation

A recent Third Circuit decision is a useful and quotable reminder that temporal correlation is not enough to prove causation.

Causation is an indispensable element of any product liability action. It is the same in pharmaceutical third-party payor (TPP) class actions, where it is often the element most likely to defeat class certification. Unsurprisingly, plaintiffs often employ creative workarounds in an effort to sidestep obvious causation problems. In In re Avandia Marketing, Sales Practices and Products Liability Litigation, — F.4th —, 2026 WL 2093904 (3d Cir. July 21, 2026), the Third Circuit made clear that there are no shortcuts.

According to the plaintiff TPPs, the defendant pharmaceutical manufacturer had marketed the medication at issue as not only treating diabetes but offering cardiovascular benefits too. The plaintiffs claimed that the promotional campaign caused physicians to prescribe the medication at inflated rates, forcing the plaintiffs to reimburse prescriptions they would not otherwise have covered.

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Paraquat MDL Lone Pine Order Creates New Hurdles for Nonsettling Plaintiffs

The multidistrict litigation (MDL) concerning paraquat-based herbicides — In re: Paraquat Products Liability Litigation, MDL No. 3004 (S.D. Ill.) — has become a focal point in mass torts. Thousands of plaintiffs allege that exposure to paraquat caused them to develop Parkinson’s disease (PD). The litigation has featured high-stakes scientific disputes, key defense wins, a master settlement agreement, and now Case Management Order No. 25 (CMO 25, 2026 WL 1707147), a Lone Pine order with important implications for nonsettling plaintiffs and a potential roadmap for effective case management in other MDLs.

In April 2024, the MDL court excluded the plaintiffs’ sole expert on general causation. That ruling left the plaintiffs unable to establish general causation, and the court accordingly granted the defendants’ motion for summary judgment. But that ruling only formally applied to the four bellwether cases; while the bellwether plaintiffs’ inability to establish general causation portended problems for every plaintiff in the MDL, the litigation continued.

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Significant Drug & Device Developments of 2025

As we welcome the new year, it is time to reflect on some of the most significant legal developments in the drug and device space in 2025.

1. Navigating a New Skepticism in Science

Not long ago, the average American likely could not name the U.S. secretary of health and human services. Yet, following this year’s change in administration and major shakeup in the regulatory landscape, skepticism in science has become the elephant in the room for anyone working in the drug and device sphere. Practitioners should start thinking about how to present scientific evidence to juries in 2026 as the old norms may no longer apply.

Read the full article on the Faegre Drinker website.

Causation Conundrums: Implications of Georgia Supreme Court’s Interpretation of Statute of Repose in Long-Term Product Use Cases

When does the statute of repose clock start ticking on a product liability claim involving long-term repeat use of many individually purchased units of a product? According to the Georgia Supreme Court’s decision in Burroughs v. Strength of Nature Global, LLC, __ S.E.2d __, 2025 WL 2918923 (Ga. Oct. 15, 2025), the short answer is that the statute of repose starts anew for each individual unit. But, as Burroughs itself illustrates, that answer creates serious problems that may require the state’s legislature to intervene.

The Burroughs plaintiff alleged she developed uterine fibroids as a result of using chemical hair relaxers manufactured by the defendants repeatedly over nearly two decades. Specifically, she claimed she began using the products in 1995 at the age of six and used them six to eight times per year through 2014 (with one brief hiatus). She developed uterine fibroids in 2018 and filed suit in 2022. The defendants moved to dismiss the plaintiff’s strict liability claims on the basis that they were barred by the statute of repose. Georgia’s product liability statute of repose requires actions to be commenced within 10 years of “the date of the first sale for use or consumption of the personal property causing or otherwise bringing about the injury.” OCGA § 51-1-11(b)(2) (emphasis added). The trial court denied defendants’ motion. The court of appeals reversed, holding the plaintiff’s initial purchase of the first unit of the defendants’ products was a “first sale” that triggered the statute of repose and barred her filing an action more than 10 years later.

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Close, But Not Quite: Eastern District of North Carolina Excludes Experts Whose General Expertise Does Not Enable Specific Opinions Offered

Even “[a] supremely qualified expert cannot waltz into the courtroom and render opinions” unless those opinions pass muster under Federal Rule of Evidence 702. Clark v. Takata Corp., 192 F.3d 750, 759 n.5 (7th Cir. 1999). As a recent case from the Eastern District of North Carolina illustrates, this principle is at play not only when critiquing an expert’s methodology, but also the expert’s expertise.

In Williams v. Sig Sauer, Inc., — F. Supp. 3d —, 2025 WL 2643400 (E.D.N.C. Sept. 8, 2025), the plaintiff was an “enforcer” for his motorcycle club who “protect[ed]” and “monitor[ed]” the club members. He alleged that his pistol discharged and injured him while he was adjusting his position on his motorcycle. In support of his product liability claims against the manufacturer of the pistol, he proffered two expert witnesses: a gunsmith and a mechanical engineer. The defendant moved to exclude both experts and filed a motion for summary judgment.

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Nothing Shocking Here – Eleventh Circuit Affirms Defense Win in Electroconvulsive Therapy Case

When a case involves electroconvulsive therapy (ECT), one might think it originated out of the Twilight Zone. Despite the misrepresentation of such therapies in popular media, modern ECT serves as a valuable option for patients with certain severe mental health conditions who have tried other therapies without success. Although ECT is far safer today than it was when the stigma attached to it was formed, it still carries risks such as confusion, memory loss, and some physical side effects. One need not enter another dimension to envision why a plaintiff might claim damages arising from those risks. Much like Rod Serling’s anthology, the Eleventh Circuit recently closed the door on one such episode.

In Thelen v. Somatics, LLC, — F.4th —, 2025 WL 2749888 (11th Cir.), the plaintiff suffered from depression and mental health issues so severe that he attempted to take his life numerous times in numerous ways. During a two-year span, he received 95 ECT treatments to address his conditions. He was later diagnosed with a neurocognitive disorder that caused severe memory loss.

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