What would the 20 milligrammes / 100 millilitres be as a %ge?
paulo: Assuming that the density of blood is not too different to that of water (1 gram per millilitre) - approximately 0.02% (20 milligrams in 100 grams of liquid).
wasdale 20mg/100ml does not make anyone an alcoholic. It is barely higher than the body's natural content whether you have had anything to drink or not.
Alcoholism is not the issue here.
This limit will affect anyone who is not a complete teetotaller.