Needles and cotton balls Roger Clemens' former trainer says he used to inject the star pitcher at the height of his career tested positive for Clemens' DNA and anabolic steroids, prosecutors said Wednesday. Assistant U.S. attorney Steven Durham revealed the results during opening arguments in Clemens' trial on charges of lying to Congress about using performance-enhancing drugs. Clemens' attorney has accused the pitcher's former trainer, Brian McNamee, of fabricating the evidence in case he needed to blackmail the baseball star into continuing to employ him.