Northwestern defensive tackle Luis Castillo acknowledged in a letter to all 32 NFL teams that he took steroids following the 2004 season, league sources told ESPN.com. Sources said that Castillo tested positive for androstenedione at the Indianapolis scouting combine in February. The NFL considers andro part of the steroid family. In his letter, Castillo told teams he was frustrated that ... (Full article: 937 words)

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