.300 is a great batting average, .30 is a great breathalyzer amount.
.30? Geez, I was just a piker at .17....
Most people are passed out at that level.
The LD-50 (lethal dose of alcohol) is 0.50
Meaning 50% of people with a BAC of 0.50 die as a result.
Johnny Damon must be a long-time alcoholic to even be conscious at 0.30.