Wes McKinley didn't know what he was getting into when, in 1990, he was chosen as foreman of a special grand jury investigating potential crimes at the Rocky Flats nuclear weapons plant in Colorado. But what McKinley and the other grand jurors learned in their two-and-one-half years of listening to testimony and examining other evidence disturbed them enough to risk prosecution themselves by going public. FRONTLINE, in co-production with Oregon Public Broadcasting, examines what the grand jury learned and what led to their rebellion.