Reports are coming out today that Roger Clemens' accuser and former trainer Brian McNamee has turned physical evidence over to the federal government. What type of evidence you ask? How about used syringes and gauze containing Clemens' blood.
Perhaps the question is the same as asking why Monica saved the stained blue dress. I don't know about you guys, but most girls I know make an effort to REMOVE those stains from their dresses (after slapping me). Most trainers I know make an effort to dispose of dirty syringes and bloody gauze. But, perhaps, both were in the same situation.