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. she only could tell me that she knew that a person that she knew as luke hasler was involved.