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 John 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, or FIFRA expressly preempts state law and Monsanto’s failure to warn consumers about the dangers of glyphosate.