Weed killer in the crosshairs.

The article discusses a reexamination of the safety of the herbicide atrazine, which is an agricultural chemical. According to the author, questions about the safety of atrazine have surfaced since a U.S. environmental monitoring program detected atrazine in drinking water and studies showed the chemical's negative physiological effect on amphibians and fish, including emasculation. Topics include several research reports on the negative health impacts of atrazine. INSET: A troubled past.