he said she didn't know who she was and he'd never seen her. investigators looked in the bed of hasler's truck and could find no blood, although it looked like someone had recently washed it. so, investigators concocted a reduce, just to see how hasler would react. >> another detective took a napkin and a little bottle of water and kind of rubbed it along the back of the truck bed, kind of simulating a dna test. >> at the time, hasler showed no reaction, but later, he called friends to express his concerns. >> he started making a few phone calls to his girlfriend and two other friends at that point and mentioned that one of the conversations, you know, hey, they took a swap out of the back of my truck. so, that's really what i think kind of spun him out at that point. >> this was hardly enough even for a search warrant. but then police got a call from a woman who refused to identify herself. >> she was very distraught.