Brian McNamee has turned over physical evidence to federal investigators that he believes will show Roger Clemens used performance-enhancing drugs, according to McNamee's lawyers.

"This is evidence the government has that we believe will corroborate Brian in every significant way," said McNamee lawyer Earl Ward.

McNamee's attorneys would not discuss the details of the evidence, but according to a source close to the former Yankee strength and conditioning coach, McNamee gave the Justice Department's BALCO investigators vials with traces of steroids and growth hormone, as well as blood-stained syringes and gauze pads that may contain the Rocket's DNA.