Well, here’s one more data point for the thread. You see, I did something very similar once …
Picture it, rural Canada, 1990 something, teenage house party. Some dickhead, who was very drunk, announced that he was leaving and driving home. I informed that dickhead that he was way too drunk to drive, and I offered to call a cab and cover his cab fare. Dickhead started yelling at me, as apparently implying that he couldn’t drive safely when he couldn’t manage to put on his boots without falling over was an insult to his masculinity.
I then replied that I had already seen one person die in front of me because of a drunk driver, and if he didn’t give me his keys, I would take them from him by force. He refused and then the fight started. Actually, calling it a fight makes it sound fair, which it wasn’t. I had probably 100lbs on him, plus I was sober. After the one-sided beating was over, I took his keys, gave them to the host, and left. He ended up sleeping it off on the couch.
Apparently, the next day he went to the police station to file charges against me. From what I heard, the cops pretty much laughed at him. Then dickhead started threatening the cops, which never goes over very well. One of the cops followed him out to his car, blocked him in with his patrol car, and make him blow on the breathalyser. He blew over the limit, as he was still drunk from the night before, and ended up getting arrested. Last I heard, he still blames me for ruining his life.
Back on point, I never heard anything about it from either the cops or the lawyers, so I’m guessing it was probably a crime, but they were not interested in prosecuting it. I asked my lawyer later, and she confirmed that I could have easily ended up getting sued to bankruptcy for my actions, even if I didn’t end up charged with a crime. So I just want to state that it’s usually better to call the cops … they have immunity from civil liability.