with doug ryan's blood on it, that was it for him. >> debra saunders, once convinced of cooper's innocence now published scathing articles about cooper's guilt. the new pretension backfired on cooper's defense. >> kevin cooper's shock and the shock, testing came back saying there was kevin's dna on a-41. >> but for hile, the dna results raised a red flag. >> back in 1983, the lab technician daniel had testified that he had consumed a-41 during his testing. now he was asked to make sure that a-41 still existed. >> we have a photograph of the envelope that shows the date he took it out and when he resealed it. so we know he had a-41 on his