(July 26, 2022, 1:17 PM EDT) -- CHARLESTON, S.C. — A husband and wife on July 22 sued 3M Co. and other chemical companies in South Carolina federal court contending that they knew and “negligently failed and/or refused” to warn the public that the per- and polyfluoroalkyl substances (PFAS) in the firefighting agent aqueous film forming foam (AFFF) was toxic and had the ability to harm the public through inhalation and the pollution of groundwater....