0.30 BA is what an alcoholic would blow. For most people, you would be dead.
In my professional line of work I deal with traffic safety quite a bit. Despite that, I never understood the whole fixation our society has on sobriety limits for intoxicated driving. Groups like MADD pretend that reducing the blood-alcohol limit from 0.10% to 0.08% (or lower) will improve motor vehicle safety, but I’m sure the vast majority of major alcohol-related motor vehicle fatalities involve drivers who are way above those numbers. Reducing the BAC limit from 0.10% to 0.08% does nothing when you’ve got knuckleheads out there driving above 0.20%-0.25% like this.