The Supreme Court ruled 7-2 on June 25 that Monsanto cannot be held liable under state law for failing to warn consumers that Roundup weedkiller might cause cancer, blocking thousands of pending lawsuits. The decision found that federal law preempts state-level failure-to-warn claims on pesticide labels. This eliminates one of the largest product liability litigation waves in U.S. history—plaintiffs had claimed glyphosate (Roundup's active ingredient) causes non-Hodgkin's lymphoma. The ruling significantly narrows the scope of product liability law by prioritizing federal regulatory authority over state consumer protection claims.