Cat,
I'm sorry to report his behavior is typical of an addict. They tend to think they are special humans and that rules and consequences don't apply... Seeing it in my son would probably make me stroke out after dealing with it in my husband.
I've posted to the Floyd P Garrett articles at least once a week. I recommend them - highly.
So he's been worked up and doesn't have anxiety, OCD or depression. He just wants to get high. But he does have a brain issue now after this accident. And he got off easy again with the police.
What do you and his father want to do? Aworriedfather had a structured plan and that isn't really working. Hummingbird has a current story unfolding with her son too. I think it is soul wrenching to kick your kid out of the home. I think being a parent of an addict is torture. Tough love for an addict young adult is doing the opposite of what we are taught or Experienced About parenting.
Peace. Work towards that.