. >> i moved to florida and came prngs zprn there's a lot lingering suspicions -- >> i moved to floridaating and go to the beach and just relax. and that lasted a couple months. i got very bored. >> reporter: and so three bored ex-detectives put on badges again to form the sheriff's very first official cold case unit and decided early on they'd work on tara's case. prosecutor feinberg was finally optimistic, sort of. >> i always felt that this was a case that could be solved. if it had a new set of eyes, it had somebody that could put the case together, connect all of the dots. >> reporter: what requests did you make of them? >> we wanted to know more about every piece of evidence, every -- we have to rule out every piece of dna in that house. so it was closing doors, it was excluding other people. >> reporter: so, that's what these three did, as a large photo of tara kept watch. but again, there was no dna to help them. all they had really were lingering suspicions about the workmen who went to tara's house the day she vanished. phil barr, the guy who owned the septic tank business, hi