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Supreme Court shuts down thousands of lawsuits that claim Roundup weedkiller might cause cancer

The 7-2 ruling bars state failure-to-warn claims because federal pesticide rules did not require a cancer warning, potentially ending thousands of cases.

  • The U.S. Supreme Court ruled 7–2 on Thursday in favor of Monsanto , dealing a massive legal victory to the agrochemical giant by heavily restricting the ability of cancer patients to sue over the weedkiller Roundup.
  • The landmark decision establishes that federal regulation overrides state law, with Justice Brett Kavanaugh writing for the majority that because the EPA evaluated glyphosate and explicitly determined it does not require a cancer warning, state-level "failure to warn" lawsuits are legally preempted.
  • The ruling severely handicaps a wave of roughly 200,000 product liability claims, shutting the door on tens of thousands of pending lawsuits filed by home users and groundskeepers who allege they developed non-Hodgkin lymphoma from the product.
  • The case centered on Missouri resident John Durnell, who was awarded $1.25 million by a state jury in 2023 after using Roundup for over two decades to beautify local parks; Thursday’s high court decision effectively invalidates those state court findings.
  • The decision creates a complex political rift for the Trump administration, as the ruling aligns with the administration's business deregulation goals but severely frustrates Health Secretary Robert F. Kennedy Jr. and the "Make America Healthy Again" movement, which has fiercely campaigned to outlaw glyphosate.
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This file photo from January 26, 2017, shows containers of Roundup, a Monsanto-branded herbicide for weeds and lawns, displayed on a shelf alongside other products for sale at a hardware store in Los Angeles. Monsanto reported its financial results on Thursday, April 5, 2018. (Photo by Reed Saxon/Associated Press, file). Read this article in English: The U.S. Supreme Court ruled Thursday that federal law protects Monsanto from tens of thousands…

·San Diego County, United States
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Reuters broke the news in New York, United States on Thursday, June 25, 2026.
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