Vessel operator runs aground near his home at night returning from dropping off friends. Responding Marine Patrol investigate crash and arrest operator following his admission that he drank earlier in the day. Some signs of alcohol impairment are present, but operator obviously injured in crash that caused heavy damage to cockpit of vessel. Defense presents evidence of facial/head injury and expert medical witness to explain the presenting symptoms of concussion, which are nearly impossible to distinguish from intoxication. Not Guilty Verdict on BWI charge following trial.