A lot of you are mentioning putting a kid out. It seems that it got the op's son's attention. So maybe it worked. When we gave ds an option to stop some of what was going on or live somewhere else he chose to leav. I knew he had somewhere to go. He just didn't realize his young adult friends didn't have this great life he thought they did. They had no food in the house for one. When he came home, we were all able to sit down and talk about what each of us wanted to happen.
I would have never done it without knowing exactly where he would go. Perhaps the op knew where her son would go too. I hope so.
Otoh, I have seen kids put out and stay under a bridge. That, imo, is detrimental to the situation. Others have moved in with their gf/bf and family which is headed in the wrong direction.
After Leslie Mahaffy, I'm honestly surprised anyone would think it's a good idea to kick a child out into the street.
Leslie Mahaffy was a "rebellious teen", just 14 years old. One night, when she once again broke her curfew, her mother locked the door and went to bed. "Tough love". If she couldn't learn to respect the curfew, then she'd learn what it was like to spend all night on the street.
Well, she was sitting on the curb in front of her house when Karla Homolka and Paul Bernardo pulled up and forced her into their car, wrapping a sweatshirt over her head to muffle her screams. Her mother slept through everything. Leslie was raped and horrifically tortured for at least 24 hours, before they finally murdered her.
Several years ago, there was a family in my church who tried to kick their "rebellious teen" out of their home. She'd been caught with marijuana and was refusing to go to drug counselling, so they kicked her out. They were hoping she'd come crawling home, all repentant, when she realized that she'd have to sleep on the street. Their plan didn't quite work, as right away another family in the church took her in and let her live with them.

The mother in that family said, "I won't let another young girl be put in danger!" This caused all sorts of tension between the families, but eventually things calmed down, the girl made peace with her parents, and she's now in university. Alive and doing well.
I really think it's a parent's responsibility to ensure their child has somewhere to go, if they are kicking them out. Heck, I wouldn't even throw an adult roommate out, without ensuring they had somewhere to go! I know one of the biggest reasons I moved out, was realizing that my mother's home was NOT my home, and never would be. I might have lived there just as long as she had, but it would always be her home. If I ever wanted a place of my own, a place where I
belonged, I was going to have to leave. And I think that's a sad feeling for a teenager. I really hope I've never made my kids feel that way.
(My mother tells people she kicked me out, but it's not at all how it happened. I walked out, tracked down a friend, and slept on her bedroom floor for two weeks until I found an apartment to share with roommates. Leaving was my decision, not hers. And when I've confronted her on the fact that she's making up stories that didn't happen, she just says that it was "a very painful time" and she doesn't want to remember it.

Pfft. I suppose she'd say I was a "rebellious teen", too.)