In a landmark decision, the US Supreme Court has blocked a Missouri court's ruling on the popular weedkiller Roundup, preventing a single state court from setting a precedent that could have far-reaching implications for the entire US market. The Missouri court had initially ruled that Roundup's manufacturer, Monsanto (now owned by Bayer), was liable for damages in a case involving a man who claimed the product caused his cancer. However, the Supreme Court's intervention has effectively put the brakes on a potential flood of similar lawsuits, potentially saving the company billions of dollars in damages. The ruling is a significant victory for Bayer and other manufacturers of glyphosate-based herbicides, but it also raises questions about the role of state courts in shaping national policy on product liability.


The Supreme Court’s Roundup ruling keeps a single Missouri courtroom from setting the rules for every weedkiller sold in the country.