Associated Press
Daniel Butler, the prosecutor for the perjury trial of former Major League Baseball pitcher Roger Clemens, front, leaves federal court in Washington, Friday, May 25, 2012. A forensic scientist testified Friday that two cotton balls and a syringe needle allegedly saved after a steroids injection, tested positive for Roger Clemens' DNA, a key moment as the government tries to prove the former pitcher used performance-enhancing drugs. (AP Photo/Manuel Balce Ceneta)

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