As far back as 1950s, studies conducted by 3M studied the toxic doses of PFAS in mice and researchers at Stanford found fluorinated chemicals could build up in our blood. By the 1960s, animal studies conducted by 3M and DuPont revealed that PFAS chemicals could pose health risks. But the companies kept the studies secret from their employees and the public for decades. Here is a timeline of internal memos, studies and other company documents detailing the two companies’ history of deception.
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