cancer risk recommendation of what s acceptable. the state s top environmental regulator, who says part of his mission is to protect human health, also says this. 0.2 doesn t mean anything to me. i want to get as close to zero as i possibly can. to artificially target a number that you can t you can t legally enforce, it actually makes no sense. reporter: this man is an executive officer of the company and a manager of the plant. so this company doesn t believe that it causes cancer? that s correct. reporter: this summer, the company commissioned a study which argues that color oh preen s should be changed from likely kars knowgenic to possibly kars knowgenic and that 0.2 should be 31.2. we ve looked at the study they did and how they came up with that 0.2, and we have found