Quote:
But until you have some ways of measuring it, we'll never know how it feels

Whah? You know how you feel at that moment. If you have any question about whether you should drive, such that you'd reach for a device to tell you what your BAC is, then you shouldn't drive. Not every time you blow a 0.4 will feel the same, because there are a lot of other factors that contribute to how drunk you feel.

Quote:
And considering how expensive drinking fines are, simply knowing "I'm fine to drive" doesn't hold up too well in court.

Neither does a BAC reading obtained on a $30 toy from Sharper Image.
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- Tony C
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