narrator: and that search for something new turned up a possibility when dna analyst monica quaal sawrom a cutting-edge forensics company called parabon nanolabs. quaal: we were contacted by a neighboring agency saying that they had some interesting science that a new agency was doing, and they were interested in sharing with us. narrator: parabon claimed that they could take dna evidence to a completely new level. they said it was possible to put a face on unidentified dna, that the human genome combined with massive computer power could actually tell investigators what someone looked like just from their dna. detectives believed sierra bouzigard's killer was an undocumented mexican worker. but there was no clear description of the suspect. monica quaal raced to tell her fellow investigators that this new technology could provide that description. i really think that she's crazy. she was like, "you just have to have faith in me." i was like, "i have faith in you, but this just kind of seems like magic." and she's like, "no, it's gonna work." and so she convinced me and then we convin