According to a report in The New York Times, attorney Rusty Hardin says the proof is in the test results provided to the U.S. Congress in advance of Clemens' February 2008 appearance before the House Committee on Oversight and Government Reform.
"The results show Roger was negative in every respect, performance-enhancing drugs and masking agents," Hardin told The Times.
Hardin told The Times he was revealing the information about the 2003 results to show his client is not among the 104 players who tested positive in the first year of drug testing in baseball, as he said some have suggested in recent weeks. Alex Rodriguez and Sammy Sosa are among the players linked to the positive tests in 2003. Those test results were supposed to remain anonymous.
Hardin said a member of Clemens' legal team contacted the company that oversaw the 2003 testing, requested the results and then forwarded them to the House committee.
The Times story said the revelation does not have a direct bearing on Clemens' ongoing legal issues surrounding trainer Brian McNamee's assertion that Clemens used performance-enhancing drugs.
John Schlegel is a national reporter for MLB.com and writes an MLBlog, The Grind. This story was not subject to the approval of Major League Baseball or its clubs.