You are making just a big assumption that your devices will do anything. First you have to actually get them in cars, not an easy task, then you have to keep drunks from disabling them, and impossible task. In this thread it has been said that only 30% of wrecks are caused by drunk drivers, and only a percentage of them would have been stopped by a breathalyzer, as at least some people that are likely to drive drunk are going to have either disabled them or found some other way around it. So, huge expense and inconvenience for a small change in overall incidence. And if yours was, I would be for it. But just the thought of getting all the used cars out there retrofitted with a breathalyzer is enough to convince me it will never happen. So I believe that you are the one wanting a utopian world to solve your problem.