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I have always thought a "breathalyzer" should be some mechanical device that measures the same skills one needs to capably drive a car. If you can not adequately handle that then you can not drive no matter what the "impairment"; whether it be booze, pot, old age or simply some other cognitive or motor skill issue. And although I would like to see it happen faster, even google, benz, etc. admit that fully autonomous cars are a long way away.