Mealey's (May 4, 2021, 1:24 PM EDT) -- PHILADELPHIA — A man who has Parkinson’s disease and his wife on April 30 sued three companies that manufacture the chemical paraquat, which is used in various herbicides, in Pennsylvania federal court, contending that they are liable for his injury because they “knowingly unleashed a product they knew caused Parkinson’s disease” and hid the dangers of it from the public and government safety agencies. The complaint is one of six separate actions filed in a coordinated effort against the companies....