From the article linked by Ebbie:

"The discovery in Minnesota over a decade ago of frogs with extra legs, ovaries in males and other deformities was considered an early warning sign of environmental distress linked to farm chemicals.

Congress in 1996 required the U.S. Environmental Protection Agency to study how the pollutants may affect human health. A decade later, however, officials said the agency hasn't tested any chemical, the Post reported.

"I would have hoped it would have been faster, but this is a very difficult program," said Clifford Gabriel, director of the EPA's Office of Science Coordination and Policy."



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