I have a daughter who's 15 and I see some behaviors that could be considered the "ISM's". I've learned that when I am looking for "warning signs" I see them and when I'm not looking, I don't see them. And what I mean by that, is everything depends on my perception. I can subconsciously manufacture warning signs. And even if they were there, really, what power do I have to stop my daughter? Yes, I can know who she's with and where she's going; I can be in touch with other parents, I can be aware, but ultimately I can't stop her from drinking -- and likely, the more I would try to, the more she would go ahead and do it anyway.
What I do, is I live by example, we "talk recovery" in my house, and I keep the lines of communication open, so if and when my daughter experiments with alcohol, I can be there for her.