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Were many unknown dna profiles. could one of these unknown profiles have been the killer? >> reporter: the defense noted that something had set off the warehouse alarm system just three days before the murder. >> and you think that's significant? >> yeah, yeah it's significant. that means that someone could have gained access to thermo fisher. >> reporter: after both sides had presented their cases, it was time for closing arguments. >> no one could think of any reason to kill michelle mockbee. so what motive would david dooley have to kill michelle mockbee? >> reporter: but it was only after ...

The technology was going to be there. dna profiles are a bit like car number plates. one plate, one car. there has been a register of plates since 190a. the database of police dna profiles only began in 1995, and wendy's killer wasn't on it. but part of another plate can tell you where and when a car was registered. and now part of a dna profile can tell you the family the sample likely comes from. you can imagine over 65 million people in the uk, there are around 6.5 million profiles on the national dna database. through science, through algorithms, through brilliant individuals, they will na...

Michella's killer. but even more confusing, dr. fitzpatrick's genealogy research had linked the name washburn to the dna in jenni's murder. which detective wade new happened months after washburn phoned in that tip about michella. so, it was all just a fluke, probably. >> and so, it was something that i kept in the back of my mind, as we continued on with the investigation. >> she also went to a company called parabon, that turned dna profiles into computer generated images. showing what the suspects probably looked like. in 2016, armed with those snapshots. >> these two are solvable. >> the t...

Been dead almost 40 years. the coldest of colorado cases. that's when a new detective shannon janssen was assigned to the case. >> but i focus on when i'm working a case, what drives me the most is the victims. >> jensen had been a competitive rover before she enrolled in the police academy and joined law enforcement, she got to know howling through all the pictures and information in the case filed. she was hoping to get to know someone else. >> what do you know about your unknown suspect, you know it's a man, you know he's between the ages of -- >> we don't know his age. we know that the wit...

The Tamil Nadu government today launched a Forensic DNA Profile Search Tool and said it will be useful in various aspects, including reuniting abducted and missing children with parents based on DNA.