I wonder how well current adaptive cruise control/collision prevention technology works to help someone safely drive drunk. I don't own a car with these features but once rented a 2021 Nissan for a road trip and just set the cruise control to 70 and it would maintain a safe distance from other cars automatically down to like 20 mph iirc. I didn't, but I probably could have been drunk and driven that car without much issue, not that I am advocating for this.

There's probably already a bunch of data being collected about cars parked at e.g. a bar for a few hours that's being used to train some AI to detect driving behaviors associated with drunk driving or something like that.