ARSENIC IS A CARCINOGEN. “The US National Toxicology Program (NTP) is formed from parts of several different government agencies, including the … NIH), the … CDC, and the … FDA. In its most recent Report on Carcinogens, the NTP classifies arsenic and inorganic arsenic compounds as “known to be human carcinogens.”
http://www.cancer.org/cancer/cancercauses/othercarcinogens/intheworkplace/arsenic