Mealey's (May 27, 2021, 11:57 AM EDT) -- DES MOINES — A farmer who contends that he is at increased risk for developing Parkinson’s disease due to his exposure to the herbicide paraquat on May 3 filed a putative class action against the companies that make the chemical, contending that they knew, or should have known, that paraquat is toxic and “kills humans and animals.”...