no offense but worrying about that sort of thing is insane , those sound like urban myths to me. no supporting links or articles to back up these supposed stories.. if you have kids you already check every place they go as a habit ( if you dont , some email prob isnt going to help )
Im sure things like this "could" happen , and if there are parents out there that just send their kids off willy nilly i suppose it might help but doubtfull