CNN Anderson Cooper 360 December 7, 2013 01:42:00
Hidden from the defense, documents showing the state analyzed blood found on the carjacking victim's. the blood type is b, thompson's is o. a junior assistant da hidden those blood test results and took the pants from the evidence room. on his death bed he revealed that to a prosecutor. that was five years before thompson's team discovered it and still, nobody said a word. in this case nick is his defense lawyer. how key was that? >> we knew it would save his life. >> reporter: after that explosive discovery, the armed robbery conviction was thrown out. then in 1999, thompson was taken off dea...