Personally, I think that if all cars were equipped with a mandatory Breathalyzer, it would lead to higher crime rates; people high jacking others to where they want to be but are unable to start their vehicles. There again, it seems so much talent is wasted on finding ways to beat the system, someone would invent an aftermarket contraption to disable or override the Breathalyzer. A good public transportation system would greatly reduce the number of DUIs, but it would also reduce the revenues that are raked in by cities and the legal system.