Originally Posted by
NOC40
But I think 1.0 BAC is 1 per 1000, ie 0.1%. 0.4% is considered fatal
BAC (blood alcohol content/concentration) is a dimensionless quantity, usually expressed as a ratio or percentage.
So while a BAC of 1 in 1000 (i.e. 0.1%) makes sense, simply quoting BAC = 1.0 is meaningless.