The Supreme Court Roundup hearing 2026 put every justice on the record Monday in one of the most consequential pesticide cases in decades. The court heard oral arguments in Monsanto Company v. Durnell, a case centered on John Durnell, a Missouri man who sued Monsanto in 2019 after his 20-year exposure to glyphosate — the active ingredient in Roundup — led to a diagnosis of non-Hodgkin’s lymphoma. A jury awarded him more than $1 million in damages after finding that Monsanto had failed to properly warn users of the cancer risk. Today the justices considered whether that verdict should stand — or whether federal pesticide law wipes it out.
The core question before the court is not whether glyphosate causes cancer. The justices will not decide that. What they will decide is who gets to determine what appears on warning labels — the EPA, which has consistently concluded glyphosate is unlikely to cause cancer and has not required a cancer warning on Roundup, or state juries applying state consumer protection law. Monsanto’s lawyer, former Solicitor General Paul Clement, argued for uniformity. “It’s probably the most studied herbicide in the history of man,” he told the justices. “You shouldn’t let a single Missouri jury second guess that judgment.”
Supreme Court Roundup hearing 2026: Kavanaugh leans toward Bayer, Roberts and Jackson raise doubts
The questioning revealed a court genuinely divided. Justice Brett Kavanaugh appeared to agree with Monsanto’s argument that a national standard should govern pesticide warning labels, not a patchwork of state jury verdicts. The Trump administration’s solicitor general took the same position. Principal Deputy Solicitor General Sarah Harris argued that the EPA is in the driver’s seat: “Missouri thus requires adding cancer warnings but federal law requires EPA to approve new warnings and tasks EPA with deciding what label changes would mitigate any health risks. State law must give way.”
But Chief Justice John Roberts pressed back on the speed problem. He acknowledged that uniformity has value — but asked what happens if the federal government moves more slowly than states want to on new information about a chemical’s dangers. “If it turns out they were right, it might have been good if they had an opportunity to do something, to call this danger to the attention of people while the federal government was going through its process,” Roberts said. Justice Ketanji Brown Jackson raised a related concern: the EPA’s re-registration requirement for pesticides runs on a 15-year cycle. “There’s a 15-year window between when that product has to be re-registered again and lots of things can happen in science,” she said. For context on what a Bayer victory would mean for U.S. agriculture and the 100,000 pending cases, Agroinformacion covered the full background of Monsanto v. Durnell and its agricultural implications ahead of today’s hearing.
The unique wrinkle in Durnell’s case that could change everything
Durnell’s case has a factual wrinkle that distinguishes it from most Roundup lawsuits. His claim is not based primarily on the product’s label. It is based on Monsanto’s marketing materials from the 1990s and 2000s — advertisements that portrayed Roundup as completely safe, showing users applying it without protective gear in shorts and a t-shirt. Because the Federal Insecticide, Fungicide, and Rodenticide Act governs labeling rather than general marketing communications, Durnell’s lawyer Ashley Keller argued that his claim falls entirely outside the scope of the preemption question. If the court accepts that argument, it could rule narrowly — leaving the broader FIFRA preemption question unresolved and sending the case back on narrower grounds.
Bayer, which now owns Monsanto, currently sells glyphosate-based Roundup only to farmers and businesses, having removed it from residential garden products. The company has been pushing for a broad settlement to resolve the mounting litigation. The Supreme Court’s ruling — expected before July — will determine whether tens of thousands of remaining state-court cases can proceed or must be dismissed. The original coverage was published by NPR on April 27, 2026.