Police respond to report of two (2) car collision in beach parking lot.  MA Driver standing outside vehicle admits that he was driving and each driver “hit” the other backing up at same time.  Police note odor of alcohol, glassy/red eyes and slurred speech.  Driver struggles with field sobriety tests.  Defense prepared to argue lack of evidence of operation without witness corroboration and driver’s learning disability hindered his comprehension of field sobriety test instructions.  DWI charge dismissed before trial.