Supreme Court Rules FIFRA Preempts State Failure-To-Warn Claims Over Roundup Labels
On Thursday, June 25, 2026, the U.S. Supreme Court held 7-2 that the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) preempts state failure-to-warn claims about Roundup labels.[1]
Justice Brett Kavanaugh wrote the majority opinion, and Justices Ketanji Brown Jackson and Neil Gorsuch dissented.[1] The Court said state tort claims are barred when they would require labeling "in addition to or different from" EPA-approved labels.[1] The ruling wipes out Missouri resident John Durnell's $1.25 million jury award and could block thousands of similar suits.[2]
In 2015, the International Agency for Research on Cancer labeled glyphosate "probably carcinogenic," spurring thousands of state failure-to-warn lawsuits against Monsanto.[2] John Durnell sued Monsanto in Missouri in January 2019 and won a $1.25 million verdict in October 2023 that made its way through the appeals process to the Supreme Court.[2] The Environmental Protection Agency has repeatedly found glyphosate is not likely to be carcinogenic and has not required cancer warnings on product labels, a regulatory stance central to the Court's preemption ruling.[2]
Solicitor General John Sauer formally sided with Monsanto at April oral argument, and protesters gathered at the Court during argument.[1] Bayer said the decision is "good for science, farmers, and industries that depend on regulatory clarity for innovation" and that it should "significantly contain" Roundup litigation while the company still plans a proposed $7.25 billion class-action settlement.[2]
The mainstream summary does not mention that the U.S. Environmental Protection Agency (EPA) has consistently concluded that glyphosate, the active ingredient in Roundup, is not likely to be carcinogenic to humans, a fact that underpins the Court's preemption ruling. This regulatory stance has significant implications for the thousands of lawsuits that could be impacted by the decision, as it effectively removes the grounds for state-level claims that contradict federal assessments. The summary also overlooks the broader legal context in which this ruling occurs, specifically the expansion of federal preemption doctrine limiting state tort claims in product safety and labeling cases, which has been characterized as an 'anti-deference pro-preemption paradox' by legal scholars. This paradox highlights the Court's tendency to favor federal agency actions while simultaneously reducing deference to those agencies in other regulatory matters, reflecting a complex interplay between national uniformity and corporate interests in liability protection.[3]
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📊 Relevant Data
The U.S. Environmental Protection Agency has repeatedly concluded that glyphosate, the active ingredient in Roundup, is not likely to be carcinogenic to humans and has not required or permitted cancer warnings on product labels under FIFRA.
Glyphosate — US EPA
📌 Key Facts
- On Thursday, June 25, 2026, the Supreme Court issued a 7-2 decision written by Justice Brett Kavanaugh, with Justices Ketanji Brown Jackson and Neil Gorsuch dissenting.
- The Court held that [FIFRA]('expressly preempts') state-law failure-to-warn claims when those claims would impose labeling requirements “in addition to or different from” EPA‑approved labels, a central basis for dismissing John Durnell’s claim (NPR reporting).
- Justice Jackson’s dissent argued the majority misreads FIFRA, said adding a cancer warning would not conflict with the statute, and emphasized the decision leaves Durnell without a remedy.
- The case arises from Missouri resident John Durnell, who had used Roundup for more than 20 years and previously won a $1.25 million jury verdict for failure to warn.
- The ruling comes amid an ongoing scientific dispute: the International Agency for Research on Cancer (IARC) has labeled glyphosate “probably carcinogenic,” while the EPA has concluded glyphosate is not likely carcinogenic when used as directed.
- Bayer said the decision is “good for science, farmers, and industries that depend on regulatory clarity for innovation,” that it should “significantly contain” Roundup litigation, and that it will nonetheless proceed with a proposed $7.25 billion class‑action settlement.
- NPR reports that Solicitor General John Sauer formally sided with Monsanto at the April 2026 argument, reflecting Justice Department support for preemption in the case.
- Protesters — including those using the slogans “The People vs the Poison” and MAHA (Make America Healthy Again) protesters — gathered at the Court during argument, and NPR notes President Trump signed an executive order to boost domestic glyphosate production that has created friction with some activists.
📰 Source Timeline (3)
Follow how coverage of this story developed over time
- On Thursday, June 25, 2026, the Supreme Court issued a 7-2 ruling siding with Bayer, holding that Roundup's manufacturer cannot be sued in state courts for failure to warn because EPA has found a cancer link unlikely and does not require a cancer warning label.
- Bayer said in a statement that the decision is "good for science, farmers, and industries that depend on regulatory clarity for innovation" and that it should "significantly contain" the Roundup litigation after nearly a decade of legal battles.
- Despite the ruling, Bayer stated it will still proceed with a proposed $7.25 billion class-action settlement intended to resolve many remaining Roundup claims.
- The article reiterates that the case arose from Missouri resident John Durnell, who used Roundup as his neighborhood association's "spray guy" for more than 20 years and won a $1.25 million jury verdict for failure to warn about possible cancer risks.
- The piece notes that the Trump administration views the decision as a political victory, even as some Make America Healthy Again-aligned allies oppose broad pesticide use.
- The article underscores the ongoing scientific dispute, contrasting WHO's International Agency for Research on Cancer classification of glyphosate as "probably carcinogenic" with EPA's determination that glyphosate is not likely carcinogenic when used as directed.
- NPR confirms the Supreme Court ruling was 7-2, with Justice Brett Kavanaugh writing the majority opinion and Justices Ketanji Brown Jackson and Neil Gorsuch in dissent.
- The decision explicitly holds that FIFRA "expressly preempts" state-law failure-to-warn claims like John Durnell's when they would impose labeling requirements "in addition to or different from" EPA-approved labels.
- NPR quotes Kavanaugh’s formulation that Durnell's state tort claim would impose a labeling requirement different from EPA's, clarifying the Court’s reasoning on preemption.
- Justice Jackson’s dissent argues that the majority misreads FIFRA and that adding a cancer warning would not conflict with the statute’s requirements, emphasizing that the ruling leaves Durnell without a remedy.
- Solicitor General John Sauer formally sided with Monsanto at argument in April 2026, reinforcing that the Biden/Trump-era Justice Department supported preemption in this case.
- The article notes visible public reaction: "The People vs the Poison" and MAHA (Make America Healthy Again) protesters gathered at the Court for oral argument on April 27, 2026.
- NPR adds political context that President Trump signed an executive order to boost domestic glyphosate production, causing friction with some MAHA-aligned activists who oppose the chemical.