Thursday, June 25th, 2026 — The U.S. Supreme Court ruled 7-2 that federal pesticide law preempts state-law failure-to-warn claims against Bayer over its Roundup herbicide, overturning a $1.25 million Missouri jury award to John Durnell, who alleged decades of Roundup exposure caused his non-Hodgkin lymphoma. Writing for the majority, Justice Brett Kavanaugh concluded that requiring Bayer to add a cancer warning under Missouri law would directly conflict with the label approved by the U.S. Environmental Protection Agency (EPA). Because of that conflict, the court held that the Federal Insecticide, Fungicide, and Rodenticide Act expressly preempts the state-law claim.
The decision addresses one of the central legal questions in the long-running Roundup litigation. Bayer has argued that it cannot be held liable under state law for failing to include warnings that the EPA has repeatedly declined to require. The Trump administration supported Bayer’s position, arguing that manufacturers must follow EPA-approved labeling and cannot independently add warnings without violating federal law.
For insurance claims professionals, the ruling is likely to have immediate implications for liability exposure, litigation reserves, and claims handling. Thousands of pending Roundup lawsuits rely on similar failure-to-warn theories. Insurers covering product manufacturers may see a substantial reduction in litigation risk if lower courts apply the Supreme Court’s reasoning broadly to pending cases.
The decision does not resolve the scientific debate over glyphosate. The International Agency for Research on Cancer classified glyphosate as "probably carcinogenic to humans" in 2015, while the EPA has maintained that glyphosate is unlikely to pose a cancer risk when used according to its approved label. Although the EPA withdrew portions of its 2020 human health assessment following a court challenge, its review of glyphosate remains ongoing. Future regulatory actions could still influence litigation involving the herbicide, even as the Supreme Court has now clarified the role of federal preemption in state failure-to-warn claims.
