:By CHARLES DUHIGG and JANET ROBERTS
Published: February 28, 2010
"But for E.P.A. and state regulators, the decisions have created widespread uncertainty. The court did not define which waterways are regulated, and judicial districts have interpreted the court’s decisions differently. As regulators have struggled to guess how various courts will rule, some E.P.A. lawyers have established unwritten internal guidelines to avoid cases in which proving jurisdiction is too difficult, according to interviews with more than two dozen current and former E.P.A. officials."