The list of toxic contaminants that spawn costly environmental litigation and propel our research projects expands constantly. One of the latest additions is the family of PFAS (per- or polyfluoroalkyl substances), which currently appear on track to have the same staying power in the world of toxic tort litigation as many of the other chemicals whose production and use we routinely document. Last year, Taylor Research Group highlighted our focus on two PFAS, perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), which were ingredients in firefighting foam. Since that time, this family of so-called “forever chemicals” has gained increasing attention.