In a pivotal session on 27 April 2026, the US Supreme Court deliberated on the case of Monsanto v Durnell, a critical legal battle that could reshape the landscape of pesticide liability. The justices grappled with the implications of federal preemption over state laws, specifically concerning the herbicide glyphosate, a key ingredient in the widely used Roundup product. As the court heard arguments, demonstrators gathered outside, voicing their concerns over the alleged carcinogenic effects of glyphosate.
Glyphosate Under Scrutiny
The case revolves around glyphosate, which has been the subject of extensive scientific scrutiny and has been linked to cancer in several studies. The World Health Organization classified glyphosate as a probable human carcinogen in 2015, propelling it into the spotlight. Bayer, the parent company of Monsanto, has faced over 100,000 lawsuits from individuals claiming their non-Hodgkin lymphoma was caused by exposure to glyphosate-based herbicides, resulting in billions of dollars paid in settlements and jury awards.
During the court proceedings, Monsanto’s legal team argued that, under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), they are shielded from liability for failing to warn consumers about cancer risks unless the Environmental Protection Agency (EPA) has identified such risks and mandated warnings. Currently, the EPA maintains that glyphosate is “unlikely” to be carcinogenic.
Diverging Perspectives in Court
Monsanto’s attorney, Paul Clement, asserted that FIFRA ensures a consistent framework for pesticide safety warnings, arguing that deviations could lead to debilitating liability for pesticide manufacturers and disrupt agricultural practices reliant on federally approved products. He emphasised that the EPA’s rigorous approval process should instil confidence in glyphosate’s safety.
Contrastingly, Ashley Keller, representing the plaintiffs, contended that FIFRA does not grant the blanket immunity claimed by Monsanto. He highlighted flaws in the EPA’s registration process, pointing out that the agency has not conducted the required reviews of glyphosate within the stipulated 15-year timeframe. Keller’s arguments were supported by the Ninth Circuit Court of Appeals, which vacated the EPA’s findings on glyphosate due to inadequate adherence to established cancer risk assessment guidelines.
The justices posed challenging questions to both sides, questioning how new scientific evidence should influence product labeling and what implications a ruling might have for consumer protections. The court’s liberal justices appeared sceptical of Monsanto’s stance, but the overall leanings of the court remain uncertain.
Public Sentiment and Political Implications
Outside the Supreme Court, protesters associated with the Maha movement rallied in opposition to Monsanto’s position, expressing frustration over governmental support for the company. Slogans like “people over poison” and “Roundup the guilty” echoed through the crowd, reflecting a growing public demand for accountability. Zen Honeycutt, founder of Moms Across America, stressed the importance of holding corporations accountable for potential health risks associated with their products.
Political figures, including Democratic Representative Chellie Pingree, also joined the protest, underscoring bipartisan concerns regarding chemical safety in agriculture. Pingree, along with Republican Representative Thomas Massie, has proposed amendments to the new Farm Bill aimed at removing protections for chemical manufacturers from state-level lawsuits, thereby enhancing consumer safety.
Anticipating the Ruling
A decision from the Supreme Court is anticipated later this summer, with potential ramifications that extend beyond glyphosate. A ruling in favour of Monsanto could set a precedent limiting consumer lawsuits against pesticide manufacturers, while a decision against the company may embolden consumers and heighten scrutiny of chemical safety regulations.
Why it Matters
The outcome of this case will have profound implications for public health, environmental policy, and corporate accountability, particularly in the agricultural sector. As the debate over glyphosate and its safety continues, the ruling could either bolster consumer protections or reinforce the legal shield for pesticide manufacturers, shaping the future of food safety and environmental health in the United States. The stakes are not just legal; they touch upon the fundamental rights of consumers to be informed about the products they use and the potential risks associated with them.
