Though the US Environmental Protection Agency labeled perfluorooctanoic acid (PFOA) a likely carcinogen(発がん物質)in 2006, it continues to be widely used in food packaging and in the processing of Teflon non-stick coatings. Traces of PFOA-family chemicals can now be found in the blood of most Americans and in the environment worldwide. Of particular concern is the grease resistant fluorotelomer(フッ素テロマー)coating used in the production of microwave popcorn packages.