US Supreme Court backs Bayer in glyphosate weedkiller legal battle
The US Supreme Court ruled 7-2 on Thursday in favour of Bayer, delivering a decisive victory in the German conglomerate’s decade-long legal battle over the weedkiller glyphosate. The justices found that federal pesticide law pre-empts state-level “failure-to-warn” claims, effectively stripping thousands of pending lawsuits of their legal basis. The ruling, written by Justice Brett Kavanaugh, affirms that Monsanto—now owned by Bayer—was required only to display the cancer warning label approved by the Environmental Protection Agency, not those demanded by individual states .
The decision marks the most significant legal setback yet for plaintiffs who had argued that Roundup’s labels failed to adequately warn of cancer risks. Justice Kavanaugh, joined by six colleagues, wrote that federal law “requires Monsanto to sell Roundup with the label that EPA approved at the initial registration and that EPA has subsequently re-approved on multiple occasions—that is, the label without a cancer warning” . Justices Ketanji Brown Jackson and Neil Gorsuch dissented. The court’s ruling applies retroactively, meaning pending cases nationwide are now vulnerable to dismissal.
Bayer’s share price surged 17% in Frankfurt following the announcement, reflecting investor relief after years of litigation that had cost the company more than €16 billion in settlements and legal fees . The company said the decision “is good for science, farmers, and industries that depend on regulatory clarity for innovation” . Legal analysts noted that the ruling could also influence similar cases involving other chemicals and consumer products, setting a precedent for federal pre-emption in product-liability disputes.
The case originated with a Missouri resident who developed cancer after decades of handling Roundup as a neighbourhood spray volunteer. His lawsuit, consolidated into a broader multidistrict litigation, had become a bellwether for thousands of similar claims . Environmental and public-health advocates criticised the decision, arguing it undermines state-level consumer protections and weakens the EPA’s ability to mandate stronger warnings. Health Secretary Robert F. Kennedy Jr. has previously described glyphosate as an environmental toxin linked to chronic disease, though the EPA has consistently maintained that the herbicide does not pose a cancer risk when used as directed .
With the Supreme Court’s ruling now final, Bayer faces an immediate wave of motions to dismiss in federal and state courts. Legal experts expect most cases to be stayed or withdrawn within weeks, though some plaintiffs may attempt to refile under narrower legal theories. The decision also closes a chapter on one of the most expensive mass-tort litigations in US corporate history, leaving Bayer to focus on rebuilding investor confidence and accelerating its agricultural innovation pipeline.
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