beach, the first time it was suspected there were no cigarette butts. the second time they suddenly found two cigarette butts. clearly, they had been taken from the hideout house. >> and then there was the blood evidence connecting cooper to the murders. this small speck labeled a-41. a-41 was examined by sheriff department criminalist daniel gregonas. >> gregonas was a rookie at the time. the standard procedure is that you test something, and you try to see whether it's that person or not. but gregonas waited until he had kevin cooper's blood type. >> he originally found a-41 did not match kevin cooper but then he changed notes to show that it did. >> so, in fact, the testing actually showed that the blood drop was not from somebody with kevin's blood type. >> other evidence, prosecutors