Why do you have to be caught to have Alcohol detection in place? What about the kid who drives drunk for the first time and wipes out a whole family?
Automatic cars were showcased on the Discovery channel about 10 years ago. What happened to them? The technology was very simple. Magnets installed in the roadway, no bigger then those reflectors in the road, and cars with a unit installed on the front and rear of the car to read the magnets. Not only did this system make it impossible to hit anything, but a side effect was that the cars were getting better gas mileage. Also the cars could drive faster,merge easier, and follow closer, speculating that traffic jams could be eliminated.
They installed these magnets, on a 100 mile stretch of highway in the desert of California, and showed they cars driving themselves, with the operators behind the wheel reading, eating,drinking and even sleeping!
The technology is out there, our government doesn't want us to have it!