The US Supreme Court has ruled in favour of Monsanto in a closely watched Roundup case, significantly limiting the ability of individuals to bring state-level failure-to-warn lawsuits against pesticide manufacturers.
In a 7–2 decision in Monsanto v. Durnell, the Court held that federal pesticide law pre-empts state legal claims that argue companies failed to provide adequate health warnings, a ruling that legal experts say could reshape future litigation involving toxic chemical exposure.
The decision is being described as a major victory for Monsanto and other pesticide manufacturers, while drawing criticism from legal advocates and public health campaigners who say it removes a key route to accountability for those harmed by herbicide exposure.
Patti Goldman, senior attorney at Earthjustice, said the ruling weakens protections for people exposed to potentially harmful chemicals.
“This ruling allows Monsanto and other chemical companies to avoid responsibility when their labels leave people unprotected from serious harm,” she said. “EPA approval does not mean a product is safe, and it should not become a shield for companies that fail to warn about cancer risks, neurological harm, and other serious dangers.”
The Court’s majority agreed with Monsanto’s argument that state failure-to-warn claims effectively impose additional labelling requirements beyond those approved by the Environmental Protection Agency (EPA), and are therefore overridden by federal law.
Critics of the ruling argue that EPA pesticide approvals are based on evolving and often incomplete data, while state-level litigation has historically played a role in uncovering evidence of long-term health risks associated with products such as Roundup.
In previous Roundup cases, internal company documents and court proceedings have been cited in arguments that manufacturers were aware of potential cancer risks that were not fully reflected in public warnings.
Opponents of the ruling also warn that federal pesticide law does not provide compensation for those harmed, leaving state courts as the primary avenue for affected individuals to seek damages for medical costs, lost income and long-term injury.
Environmental and legal groups are now calling on Congress to clarify the scope of pesticide liability laws, arguing that legislative action may be needed to restore the ability of individuals to bring state-level claims when federal regulation is deemed insufficient.
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