they asked denney to fill out some forms.ural stuff, they said. >> and what we were going to do is have him sign those forms and then put them in an envelope and then seal the envelope. there was three different envelopes. >> reporter: denney filled out the forms but didn't lick the envelopes. >> and he looks at us and says, you guys have tried three separate times to get my dna sample. he says, you can seal them yourself. is there anything else? >> reporter: the best laid plans. >> the best laid plans of mice and men. he didn't fall for it. >> reporter: denney was done, but carlyle wasn't. >> i wasn't going anywhere without a dna sample. >> reporter: so they staked him out at the computer store where he worked. and snapped these photos as their prey came outside for his cigarette breaks. once again, their mouse was a step ahead. >> he was smoking a cigarette and when he was finished with it, he would take it and put it behind his ear. >> reporter: do you think he knew that maybe you were watching him? >> i'm sure. >> reporte