MA Driver stopped for lane control issues in early morning hours.  Driver denies having drank anything in several hours and simply wishes to return home to his wife in Massachusetts after dropping off his sister.  Arresting officer describes defendant’s performance on standard field sobriety tests, but does not draw a correlation between the driver’s performance on the tests, and impairment by alcohol, according to his training.  Despite poor performance, driver found not guilty on DWI charge following trial.