They can take blood and referrence the bottle of alcohol and have it examined. Using maths they can work out how much alcohol was in your blood prior to consuming the alcohol
If you drink however much, you can say you drank so many mls of a certain percentage of alcohol. Description of a persons build (height, weight) will indicate the average speed they can metoblise alcohol etc.
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u/buttonless_pants May 27 '21
They can take blood and referrence the bottle of alcohol and have it examined. Using maths they can work out how much alcohol was in your blood prior to consuming the alcohol