bad, gut feeling from conversations that he had with cyndi that there was more to this. >> reporter: so detectives took the next step. they enlisted him as a "confidential informant" and gave him a name -- ci-17-001. >> i mean what's it like to be a confidential informant? >> during the time it was kinda cool. it was kinda like what you see on tv. >> reporter: the arrangements, however, were a little daunting. >> they came out and they asked me if i would be willing to come up there and wear a wire. >> what was it like to hear that? >> i was kind of stunned and dumbfounded for a second. and y'know after a second of thought, if she was involved y'know the right thing was to go up there and help 'em. >> reporter: careful. you can never know, when you set a trap, exactly what you'll catch. >> test, test, test. i'm almost there. >> reporter: coming up. cyndi stays silent. until -- >> all of a sudden, it happens.