i assigned detective bowhay to the case. >> there was about 20 years of investigation.andy's disappearance, he was a new deputy and he was actually involved in searching the scene. >> one of my motivators is i went to mount baker high school. we all knew the case, we all knew how serious it was, how devastating, how it impacted not only our lives personally, but as well as the community. whatcom and acme area are so tight. something happens to one family, it happens to all of us. >> every few years there'd be a story in the newspaper. they'd interview the police, and every time they would say this isn't a cold case, we're still at this. and then as you hear about dna, you start wondering about that, you think maybe dna will make a difference. >> detective kevin bowhay was the third detective with the sheriff's office to be the lead in trying to find mandy's killer, and he came up with this idea to do a systematic dna sweep of people who lived in the acme area. >> one of my co-workers had read a book called "the blooding." >> the blooding case was a very similar case to