Meth is a tough nut to crack, so to speak. It's highly important that he is highly motivated to get clean and stay clean and continue to do so....I don't know what kind of program he has going. Don't mean to sound skeptical, but a lot of folks can get clean for a short time period; it's staying clean that's hard. Beware of the post vacation "let downs" that we all get; it might be a huge trigger for him.