I have found a 'dossier' that my 15 yr old son and a friend have prepared which looks like they are fantasising about being hit men. There are 4 'targets' all real people, one is a teacher. There is a map of the school with cctv cameras marked, a map of the area and great detail about the individuals and what they are going to do to them (too gruesome to list here). I have talked to son who says it was ages ago and a stupid game. Help! What should I do? Should I involve other boys parents?