I’m sorry to hear about you’re and his progression into other substances other than booze. I hate addiction!
I guess a psych hospital can’t hold someone just for being under the influence and the same with the police. They can’t hold him just because he’s high but if the girl had pressed charges against him maybe they could have. I’ve seen the provable can get kicked down the road. The cops kicked him towards mental health and sounds like he did not meet their criteria (danger to himself or others) and let him go.
One of the things I learned about my ex A was that each time I assumed it would be his bottom, nope, he picked up and kept on digging.
Yes, keep strong, keep posting we are here for you.