(July 29, 2022, 1:33 PM EDT) -- EAST ST. LOUIS, Ill. — On July 27, a couple sued a group of chemical companies in Illinois federal court contending that they are liable for the husband’s development of Parkinson’s disease from exposure to the pesticide paraquat, which the couple contends the defendants made and sold when they knew, or should have known, it was “a highly toxic substance that can cause severe neurological injuries and impairment” including Parkinson’s disease....