( September 26, 2025, 10:50 AM EDT) -- SAN FRANCISCIO — A federal judge acted within his discretion under Daubert v. Merrell Dow Pharmaceuticals Inc. in excluding testimony from a causation expert retained by a man who sued Monsanto Co. for allegedly causing his cancer as a result of exposure to glyphosate, the active ingredient in the herbicide Roundup, the Ninth Circuit U.S. Court of Appeals ruled Sept. 25 in affirming summary judgment for Monsanto....