U.S. Supreme Court backs Monsanto in its fight against liability from popular weed killer

"The People vs the Poison" protesters gather at the U.S. Supreme Court on April 27, 2026 ahead of arguments in the case. Tasos Katopodis/Getty Images hide caption toggle caption Tasos Katopodis/Getty Images The Supreme Court agreed to shield Monsanto from liability over its popular weed killer Roundup, dealing a victory to the company's new owner as it struggles to resolve thousands of costly lawsuits from people who claim the key ingredient caused their cancers. The central issue in the case, filed by Missouri resident James Durnell, is who decides what should appear on a pesticide or insecticide label—and whether a federal law overrides state claims. The Justice wrote in a 7-2 opinion written by Justice Brett Kavanaugh that the Federal Insecticide, Fungicide, and Rodenticide Act expressly preempts state law and Monsanto's failure to warn consumers about the dangers of glyphosate. Justice Ketanji Brown Jackson filed a dissenting opinion, in which Justice Neil Gorsuch joined. Monsanto, now owned by Bayer, argued a federal law gives the power to set the label to the U.S. Environmental Protection Agency, not to the states. The company's lawyer, former Solicitor General Paul Clement, told the Supreme Court there's a need for a single, uniform standard and that the Federal Insecticide, Fungicide, and Rodenticide Act puts the EPA in charge. "You shouldn't let a single Missouri jury second-guess that judgment," Clement said during oral argument in April. The current U.S. …