PSA is 12/.02 which for most means if you still have 2 drinks in your system. A drink is considered:
12 oz of beer or wine cooler
8-9 oz. of malt liquor
5 oz. of table wine
3-4 oz. of fortified wine (sherry or port)
2-3 oz. of liqueur, cordial or apertif
1.5 oz. of brandy
1.5 oz. of spirits (whiskey, gin, vodka, etc.)
Most metabolize 1 drink per hour. So math for the FO with .035 (3 drinks) and stopped 10 hours prior to breathalyzer = 13 beers... Food and metabolism plays a variable role, but safe to say he was pushing close to 10 drinks. A good chart at How do you determine your blood alcohol concentration level? | F.T. Sessoms, Minnesota DWI Lawyer and Criminal Defense Attorney