WASHINGTON — The U.S. Supreme Court ruled 7-2 on June 25, 2026, in Monsanto Co. v. Durnell that federal law preempts state failure-to-warn lawsuits concerning the alleged cancer risks of Roundup. The Court found that a federal law regulating the sale and labeling of pesticide products bars lawsuits in state courts alleging that Monsanto failed to include a cancer warning on Roundup's labels. The Court also ruled that the company cannot be sued in state courts because federal regulations have found a cancer link unlikely.

The case originated with Missouri resident John Durnell, who developed non-Hodgkin's lymphoma after more than 20 years of using Roundup on parks in his St. Louis community. A jury awarded Durnell $1.25 million, agreeing that the company failed to warn him about possible cancer dangers.

Bayer acquired Roundup when it bought its original manufacturer Monsanto in 2018. The company previously set aside $16 billion to settle cases. Earlier this year, Bayer proposed a $7.25 billion class-action settlement to resolve many of the remaining claims. A federal judge ruled that the proposed settlement will be heard in a Missouri state court. About 200,000 Roundup-related claims have been made against Bayer, mostly from home users. Bayer has stopped using glyphosate in Roundup sold in the U.S. residential lawn and garden market.

The Environmental Protection Agency has approved a label for Roundup without a cancer warning and has determined that glyphosate is not likely to cause cancer in humans when used as directed. In contrast, the World Health Organization's International Agency for Research on Cancer classified glyphosate as "probably carcinogenic" in 2015.