For the most part, we don't actually label people "drunk drivers"...we label the act as "drunk driving" or say they were arrested for DUI. I was (wrongfuly) arrested for drunk driving once...they were putting me in a room with several other people who could barely hold their heads up. I looked at the officer and said "Were they all arrested for drunk driving?" What I--nor the police--did not say was "Are they all drunk drivers?"