Earlier quoted context omitted.
Likewise DUI in Japan. Japan is much more strict than the US. One beer before driving and you become a guest of the state for 3 years. Just don't do it.
In Japanese cities, you don't need to drive if you're drunk, and you don't even need a car at all. Just get on the train/subway, or hail a taxi, or even walk. Drunk driving is a problem in the US because you can't get home without a car except for a handful of dense cities (Manhattan, etc.). The rise of Uber/Lyft is helping this, though.
(NB driving in Japan is like driving in England except the turn signal is on the right side of the steering column, so I was constantly engaging my wipers when I wanted to turn. The locals call this "the Okinawa wave".)