 Thousands of Connecticut firefighters are suing the companies that manufacture their protective coverings over the use of a dangerous chemical. Here's WSHU's Molly Ingram with more. The lawsuit says firefighters have gotten sick from the PFAS chemicals used to keep their gear fire retardant, and that the manufacturing companies, including 3M and DuPont, knew that the materials were dangerous and did not warn users. PFAS is linked to cancer, compromised immune systems, and liver damage, according to the CDC.