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This is why we should outlaw impaired driving, of any sort. The effects of an x% blood-alcohol level (for whatever x), on real people's actual impairment, seems to vary quite a bit. If we had a good way of testing impairment, it wouldn't matter what the cause of that impairment was. A driver impaired by fatigue or stress is just as dangerous as one impaired by any chemical. The problem is that it's a difficult thing to test, I guess. Something like the old field-sobriety tests could probably work, though.