A "Do Not Enter" sign marks a field of head cabbage during the spraying of pesticides near Chualar, Calif., Monday, Sept. 16, 2002. (AP Photo/Mike Fiala)

Approval Of Herbicide-Resistant Crops Means Massive Surge Of Chemical Herbicide Use On American Crops

Researchers say they have evidence that suggests the herbicide 2,4-D is contaminated with dioxin.