The Devil We Know is a 2018 investigative documentary film by director Stephanie Soechtig regarding allegations of health hazards from perfluorooctanoic acid (PFOA, also known as C8), a key ingredient used in manufacturing Teflon, and DuPont's potential responsibility.

[6][7] The film's title refers to an internal DuPont memorandum of sticking with "the devil we know" in the continued use of perfluorooctanoic acid (PFOA), rather than spending funds to develop a safer alternative.

Sue Bailey, one of two women working at the Parkersburg DuPont facility, gave birth to a son, Bucky, who suffered the same type of facial deformity as that of Tennant's cattle.

DuPont had been conducting its own medical studies for more than four decades, which had shown that PFOA caused cancerous testicular, pancreatic and liver tumors in lab animals.

The documentary touches on the detection of PFOA in the blood of more than 98% of the general US population in the low and sub-parts per billion (ppb) range, with levels much higher in chemical plant employees and surrounding subpopulations.