Expert: DNA on medical waste was Clemens'

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

Source: http://espn.go.com/mlb/story/_/id/7971508/dna-medical-waste-matched-roger-clemens-expert-says

Emilio de Villota Ottorino Volonterio Jo Vonlanthen