Mealey's (September 13, 2022, 1:31 PM EDT) -- CINCINNATI — The Sixth Circuit U.S. Court of Appeals on Sept. 9, ruling that a class certification decision “involves important and unsettled questions of law” and finding that it could prove the “death knell of the litigation,” granted a defense request for interlocutory review of the class certification order in an injury case related to a firefighter’s exposure to per- and polyfluoroalkyl substances (PFAS) in the firefighting agent known as aqueous film forming foam (AFFF)....