Oh my dad would have scared the living daylights out of them.
I guess that's my point: if this kid was so BAD, why is this guy wringing his hands?
There's a retarded teen in my neighborhood who once came to my door offering to sell my wife a set of kitchen knives which had clearly been well, well used.
My wife politely declined and he must have just tossed the knives all over my lawn in a moment of frustration, because my daughter and I found them the next morning.
I found out later he'd been going door to door trying to sell them all over my neighborhood that day - I guess he just totally gave up after my wife said no.
Anyway, I went and asked his mom if she was missing any knives and she was confused - then she told me that his latest thing was looking through people's garbage to find salvageable stuff he thought he could sell.
I guess my point is, if it were a developmentally normal teen who pulled that little stunt I would have been extremely concerned, but in this kid's case I knew he was just trying to do a little business.
Thus my advice to the guy who started the thread - talk to the parents first, police second.