[asveikau]

My understanding is that many people drive above the legal limit for DUIs and do not get caught. DUI prosecution is somewhat the story of selective enforcement.

What would piss people off is coming into contact with the fact that they're driving illegally. I think many drivers are unaware of being above legal limits and would probably be angry when confronted with it.

I guess playing devil's advocate... There's probably some odd scenario where driving above the limit for an emergency circumstance could be justifiable. So perhaps the car should not be disabled in this way.