A recent test done compared results of three popular devices to an actual police breathalyzer machine. The results are astonishing and worrisome at the same time. In none of the cases did the device produce the same result as an actual breathalyzer machine.
The question becomes, is the device worth it? The police say if you think you are too drunk to drive where you need a pocket device to tell you one way or the other, it is probably better to not drive.
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