saliva. >> this is an opportunity for us to say, hey, if you're not the guy, let's just move on with this. >> i thought that had already been determined. >> one by one, the dna results came in from all of lynne's old lovers and male friends. none of them matched the dna from the crime scene. including doug bradford. >> it definitely was problematic because, unfortunately, the more testing we were doing, we were getting dna. there was dna in the semen. >> sure. >> belonged to two males. >> not him. >> it wasn't him. yeah, it was definitely disappointing. i knew that what i really needed was some piece of new evidence that would help. >> something physical, something forensic they could take to the la county district attorney. you had to sell this thing, though, to your bosses, right? >> yeah, i do. i do. >> but still, wallace could not get his mind off that garrote. he must have missed something.