phone/alcohol/drug use while driving (or even while not driving,) you make it crystal clear that if they ever find themselves in a situation that could put them in danger, they can call you for a safe ride home and that no questions will be asked or severe punishments dolled out. people make mistakes and your child will make plenty of them. what’s most important is that he feels safe enough to rely on you before he makes a bad decision.
most importantly, remember this: none of this advice is worth a hill of beans if you don’t model the behavior that you’re asking your kids to adopt. they’re watching you. all. 