Monsanto’s opening brief, filed on Monday, urged the U.S. Supreme Court to reverse a 2025 decision by a Missouri Court of Appeals, arguing that federal law preempts claims that it failed to warn about the cancer risks posed by its Roundup herbicide’s active ingredient, glyphosate.
Monsanto’s opening brief, filed on Monday, urged the U.S. Supreme Court to reverse a 2025 decision by a Missouri Court of Appeals, arguing that federal law preempts claims that it failed to warn about the cancer risks posed by its Roundup herbicide’s active ingredient, glyphosate.

