100,000+ Roundup Suits at Risk After 7-2 SCOTUS Preemption Ruling

For product liability defense counsel, the Supreme Court’s decision in Monsanto v. Durnell is a game-changer. The Court’s clear holding that FIFRA preempts state tort duties imposing additional labeling requirements dismantles the claim framework that fueled the massive Roundup litigation. As Justice Kavanaugh’s majority opinion explains, EPA’s registration decision is a binding federal labeling requirement, and state failure-to-warn claims that would add cancer warnings are directly preempted. This ruling not only shields registrants from a wave of pending suits but also signals a broader federal uniformity principle that may apply to other federal labeling statutes.

On June 25, 2026, the U.S. Supreme Court issued a landmark ruling in Monsanto Co. v. Durnell, holding that the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) expressly preempts state-law failure-to-warn claims that would require pesticide labels to include cancer warnings beyond those approved by the Environmental Protection Agency (EPA). The 7-2 decision, authored by Justice Brett Kavanaugh, reversed a Missouri jury verdict of over $1 million and swept away the legal foundation for more than 100,000 pending lawsuits alleging that long-term use of Monsanto’s glyphosate-based Roundup herbicide causes non-Hodgkin’s lymphoma. The ruling is one of the most significant pesticide-law decisions in decades and clarifies the scope of federal preemption under a statute that mandates nationwide uniformity in pesticide labeling.

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A Missouri state jury found Monsanto liable on a failure-to-warn theory and awarded more than $1 million in damages; the Missouri Court of Appeals affirmed.

At the heart of the case was the direct conflict between state tort duties and the EPA’s repeated scientific conclusions—over several decades—that glyphosate is “not likely to be carcinogenic to humans” and that Roundup labels may be registered without a cancer warning. In contrast, the International Agency for Research on Cancer (IARC) classified glyphosate as “probably carcinogenic to humans” in 2017 and again in 2019, fueling an explosion of litigation. The plaintiff, Mr. Durnell, had used Roundup for approximately 20 years and alleged it caused his non-Hodgkin’s lymphoma. A Missouri state jury found Monsanto liable on a failure-to-warn theory and awarded more than $1 million in damages; the Missouri Court of Appeals affirmed. Monsanto, a subsidiary of Bayer AG, appealed to the Supreme Court, which granted certiorari (Case No. 24-1068) and reversed.

The Court’s analysis centered on FIFRA’s express preemption provision, Section 136v(b), which prohibits states from imposing “any requirements for labeling or packaging in addition to or different from” those required under FIFRA. Justice Kavanaugh wrote that state tort duties constitute “requirements” for purposes of preemption. The EPA’s registration process, the Court reasoned, is not merely administrative: before registering a pesticide, EPA must determine that its labeling contains all warnings necessary to protect human health and the environment and is not false or misleading. Once approved, that label is a binding federal requirement. Allowing a state jury to impose a cancer warning would conflict directly with the EPA’s determination that no such warning is needed.