DUI in Georgia can be charged as Driving or being in actual physical control of a moving  vehicle.  Lack of Driving or Failure to Move is a great defense.  Police often assume vehicle occupants drove while impaired to whereever they are parked.  Unless the vehicle is on the side of a long strecht of abandoned road or in a Krystal (White Castle for you westerners) drive thru, there is not a very good inference of driving.  Additionally, the driver is doing the right thing by parking and sleeping it off.  I have won many jury trials using this defense.  They always provide lots of reasonable doubt.