in 2010, timothy hennis went on trial for a third time for the murders of katie east burn 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 back 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. three people had been arrested for evidence tampering. >> hennis' lawyers asked for a postponement to investigate the lab. the judge refused. meanwhile, military prosecutors found a second smear from the rain k rape kit. they sent it to a lab and the