Are they different or the same?
I have always thought that they referred to the very same thing; and I just saw a news report on MSNBC about an FAA administrator resigning after he was arrested for "DWI"; while the words at the bottom of the screen said "DUI". The network's audio and video weren't in synch.
DUI means "Driving Under the Influence" of alcohol. DWI means "Driving While Intoxicated." Is one worse than the other…is "intoxicated" more drunk than "under the influence"?
I don't have a clue, personally. But I wish the moniker monitors would settle on one, for the sake of simplicity, accuracy, and general understanding.