Portable Breath Test: By PBT, I assume you mean Portable Breath Test aka Breathalyzer. General consensus is that we take an hour to clear a unit of alcohol which varies depending upon type (and amount) of drink. Weight, coincident food, general metabolism eg thyroid function, etc affect rate. Check out http://www.nhs.uk/chq/Pages/853.aspx for more info.
Answered 4/30/2016
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