The FDA has stopped three shipments of canned clams from entering the U.S. due to high levels of perfluorooctanoic acid (PFOA), a harmful substance. The most contaminated sample was Tri-Union/Chicken of the Sea clams, with a PFOA level of 25.2 parts per billion (ppb). The FDA is investigating the potential health risks of PFAS in food, particularly in bivalves like clams, as they have the ability to bioaccumulate these substances. Currently, the FDA does not have a regulatory limit for PFAS in food and is still evaluating its approach. This action follows a 2022 policy change where products with excessive PFAS levels can be subjected to import alerts and detentions.