Associated Press
FILE - This photo provided by Emery Celli Brinckerhoff & Abady, is one of the photographs submitted to the House Oversight and Government Reform Committee in Washington on Feb. 7, 2008,  by Brian McNamee, former personal trainer for pitcher Roger Clemens, showing evidence of alleged use of steroids by Clemens. A forensic scientist has testified, Friday, May 25, 2012 in Washington,  that two cotton balls and a syringe needle allegedly saved after a steroids injection tested positive for Roger Clemens' DNA _ in a key moment as the government tries to prove the former pitcher used performance-enhancing drugs. McNamee, Clemens' former strength coach, earlier testified he collected the medical waste after injecting the pitcher with steroids. (AP Photo/Emery Celli Brinckerhoff & Abady, Senna Riahi)  **NO SALES**

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