These days they install a recording camera with facial recognition and real time GPS location software. So they know who blew, who is driving when and where to. Also, if the driver is restricted to driving to and from work between such and such hours on such and such days the car can be rendered inop outside those parameters.

In addition, the driver can be on probation such that ANY infraction of ANY law or of any other condition of that probation the car can be disabled remotely.

By the way, many new cars come with most of that stuff already installed in addition to cloud-based black boxes, event data recorders and dash cams the control of which you DO NOT have.

If you also carry a smart phone (and who doesn’t?) your every single movement, destination and conversation is monitored.

^^^ That sounds fool-proof....unless the guy decides to buy a 'beater' car when drinking.

I have heard that they can track your speed and braking on most newer cars if you are involved in an accident. It's all stored in your cars computer.

On-board data storage is already old school.

Now the data is sent to the cloud. That way, if the car is totally demolished stolen or even disappeared the data survives. In addition, access to the data in the cloud does not even require possession or control of the car itself. The manufacturers are already saying, ‘All your data are belong to us.’

Such cars will potentially have much lower insurance costs because the data can relieve the insurance companies of their duty to pay. Also, eventually, the driving habits of the insured will be the determinate of one’s insurance costs rather than one’s actual driving record. The insured’s data will record the frequency and location of ‘harsh acceleration’, ‘harsh braking’, ‘hard cornering’ and erratic driving. Each incident can count as a demerit even if there are no accidents or citations. Right now, one’s driving habits can actually be recorded such that no one (including the cops) even has to witness your driving violations, which would include any speeding on two-lane country roads with no traffic in broad daylight on a Saturday afternoon anywhere on earth. Think red light cameras on steroids AND YOU CANNOT TURN IT OFF.

2019, my one and only at 0.089, a kid in our weekend class (in lieu of jail) was under the limit but was nailed doing something silly (like the ferret on his shoulder). I'm assuming the overall punishment was not as severe but roughly paralleled a traditional drunk driving punishment.

Never had one....but probably should have in the early 70's when they lowered the drinking age to 18.
Those days, the cops were more likely to just dump your beer or send you home with a warning instead of giving a sobriety test.