un-carrier risk-free for 14 days you'll love it, or we'll pay for you to go back. >>> in 2010, timothy hennisime for the murders of katy eastburn and her daughters. but a scandal rocked the state lab that identified hennis' dna, the lab had been skewing results to help prosecutors. >> the woman who handled the sample in the '80s got in trouble for mixing up some dna samples in another case, and almost put an innocent guy in prison. >> they didn't do a good job of preserving the evidence and three people had been arrested for evidence tampering. >> hennis' lawyers asked for a postponement to investigate the lab, but the judge refused. >> meanwhile, the military prosecutors found a second smear from the rape kit and sent it to a new lab and the results also pointed to hennis. >> the medical examiner slide came back on every marker to the defendant, tested by the crime lab, you had two chains of custody the defense could not attack the slide. >> for prosecutors, the dna result swept away all previous doubts. >> they went back and replayed the first two trials, some of the old discredited inferen