My son asked me a weird question when he entered high school:
"Can you tell all my friends that you drug test me randomly?"
I looked at him and said, "I don't drug test you."
He smiled and said, "I know. But if they think you’re a psycho who tests me every Sunday, I can say no to everything at parties without getting roasted. I just blame you."
Now, whenever someone hands him something stupid, he hits them with:
"Bro, I can't. My dad is an absolute lunatic, he tests me every week and he'll take my car for a year."
Done. Zero peer pressure. Zero lost street cred.
Parents: be the villain in their stories.
Give them the excuse they need to stay clean without feeling like an outcast.