. >> reporter: dennis luken was a police detective back then. the source of those drugs tonia found in the cedar box. he started at john's house. and found a gun. illegal, because john was on probation. so he was arrested again and sent to jail. >> when he went to montgomery county jail, i called a supervisor. i said, "you've got an individual there, john meehan, and he's gonna try to con you out of drugs." he says, "he already has. he claimed he fell out of the top bunk and he got pain medication." >> reporter: you're dealing with an incorrigible person here. >> yes, sir. you're dealing with an addict. a very smart, articulate addict. >> reporter: eventually, thanks to luken, john did jail time for stealing drugs in ohio and michigan. and tonia felt guilty. wondering if she'd missed warning signs. wondered what else john might have hidden from her. never thought about the clue. way back at the beginning. on her wedding video. >> and the groomsmen who'd had some drinks and have their arms around each other, and they're talking about how they met