MA driver stopped by police for speeding near ski resort.  Officer notes odor of alcohol emanating from interior of vehicle.  Driver admits all four occupants drank beer following a day of skiing but Officer does not notice any other signs of impairment from driver.  Driver exits for field sobriety tests and later tests .10 BrAC following arrest.  Defense files Motion to Suppress to argue Officer lacked reasonable grounds for exit order and continued detention for field sobriety testing.  DWI charge dismissed prior to trial.