While highly toxic to many insect species, the toxicity of DDT to humans and its detrimental effects to other organisms is a subject of intense debate. While the links below are not exhaustive, they do present a broad overview of the ongoing discussions.

The Ritter report extract - DDT Toxicity  (full report text)

Material Safety Data Sheet (MSDS) - DDT

Cornell University - Pesticides and Breast Cancer Risk: DDT and DDE

Environmental Health Criteria 83: DDT and its Derivitives - Environmental Aspects - International Programme on Chemical Safety, 1989