That is a tough question. My personal philosphy is that I cant reach all of them. I know that. But I can reach some of them and make a difference with some. Hopefully, you will have an administrator who will help you with those kids of issues, but it is an intimidating thing to have a student in your class who is high on something. And really, theres not much you as a teacher can do about it, other than get them out of your classroom (if you can even do that) andor still try to be the best teacher and role model you can be. Sometimes you can break thru their walls and get to who they are, and hopefully help them, and sometimes you can't.