who ever said the parents are to blame is right on. you need to pay attention to your kids and when you see big mood swings in there personality its time to check it out. i have a 15 yr old son who we caught smoking weed, cigarettes and drinking alcohol. we give the kid his privacy and space, but the second we thought something was up we searched his backpack, his room, and we went to the school and searched his desks and locker. we found packs of cigarettes, a little weed, and a bottle of my jack in his room. we bought those testing kits on line more as a scare tacktic so he thinks we'll make him piss if we suspect something and he knows now what extremes we are willing to go if we suspect anything. that may seem harsh to some, but my son is not going down that path without a battle from us.