do you mean wearing a wire for them as a punishment for smoking marijuana? No, I don't think there was any repercussion or further discussion whatsoever regarding any marijuana use or anything like that (I think he actually only told them KC smoked it but I don't remember him saying he did). When you are the boyfriend of the mother of a missing child, and the child's disappearance coincides with the mother getting involved with you and your friends, you were known to have been looking to get out of your lease and change apartments on the very dates in question, etc, if LE hardly investigates you much at all, and just says "hey would you mind wearing a wire when you have lunch with her brother?" I imagine you would say, sure, why not? He could probably say no, but who would if it's LE asking? Not as any kind of punishment for anything.
Normally when a child goes missing the mother's paramour(s) is considered a POI (person of interest), it is routine. Usually they are heavily investigated to rule them out. TL was barely investigated. LE only took routine statements from him, had him show them where he'd picked her up on those days, and did a basic evidence collection/examination of the back of his jeep, no cadaver dogs or anything else. I don't think there were any cadaver dogs used or forensics even done in his apartment. Nothing severe at all.