>> so there was one hair that was found on lauren. her legs were bound by a belt. there was a hair that was adhered to the belt. megan waterman, there were three hairs found on her. amber costello, there was a hair recovered from the burlap. >> ten years ago, the police actually used the nuclear dna analysis. they attempted to do it but it failed because they couldn't get enough information. >> would you say the new dna testing was a break in the case? >> clearly, the new testing was the biggest break in our case. we would not have been able to do this in 2010 because this technology wasn't available. >> while the 2022 task force investigation that ultimately led to rex heuermann's arrest was undeny bly exhausted. >> this was unprecedented. >> 16 years of evidence, cell