DDT and tumors in experimental animals

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Abstract
A recommendation of the Secretary's Commission on Pesticides, Dept. of Health, Education and Welfare, U.S.A., implies that DDT is subject to the Delaney Clause of the Food Additives law as a carcinogen because of some findings with mice in 1969. However, the liver changes produced in rodents by high levels of DDT were not found in chickens, dogs, cats, monkeys, and large domestic animals. The changes in rats are reversible, and have been characterized as non‐cancerous. Extensive and prolonged exposure of human beings to high levels of DDT has produced no evidence of carcinogenicity, or of any impairment of health.