Technology to solve drunken driving crisis

I something that has dropped by more than half in the past 35 years really a "crisis"? I think through education and awareness the US has done really well at hitting home the point that drinking and driving is stupid. I don't think this type of technology is the way to go. Everyone person responds to alcohol differently and having a set BAC number is just stupid. Some people can drive fine at .08 while some people can't. The .08 limit is defined by who exactly? Some arbitrary bureaucrat that just decides the limit? No thanks. Why don't we train officers to make a judgement if a person is too impaired to drive instead of having arbitrary BAC limits. A person in Germany can legally drive with a BAC of .4

I can't imagine the air sensors working very well. Can it pin point which person is the source of what ever it sniffed? What happens when the driver is the DD to her four drunk friends? I would think the four drunks would set those sensors off pretty quick. Does the car know who is drunk?

touch-based sensors are going to have a lot of problems with hand sanitizer.