Somehow the two-headed trout in the appendix of a mining company’s report didn't get the attention of the Environmental Protection Agency. The EPA seemed poised to support the company’s findings that selenium, a metal byproduct of mining, was safer than current regulations indicate. But other federal scientists and environmentalists learned of the deformed trout and objected. Now selenium is back in the spotlight, and lawmakers, the EPA, and the Fish and Wildlife Service are fighting over what level should be prohibited. The trout was found in Idaho, but selenium is a pollutant at 200 Superfund sites around the country.