Not Entertainment

[Kevin]

Of course, the very first cars using such a feature will eventually kill its occupants, even if they weren't intoxicated.

First thing the designer of such a feature must understand, yet won't, is the possibility that the operator is driving erractically in order to avoid the drunken schmuck who is also driving erratically. Of course, the drunk is in an 1989 Escort with torn seats whilst the other is in a brand-new 2015 Magisterial which will override the panicked driver's clearly irrational maneuvers and continue straight along the intended path per GPS calculations and cold computer logic.

Of course, the 2016 model will include the fix. Which won't help the folks who demonstrated the need for such a refinement in the first place.

I hope you were being sarcastic. The most likely scenario is that, like what happens with remote kill switches now, the car will pull off the road, and turn off the engine and refuse to restart for X time and / or until the breath sensing unit is re-used. Pulling off the road to avoid a drunk driver is still a very viable option and one that I personally have used successfully before.