State police stop client at 3:00 a.m. in Fitchburg after observing him swerve into parking lot without signaling and nearly causing a collision with car traveling behind. Trooper detects strong odor of alcoholic beverage, slurred speech and a can of beer on passenger-side floor. Client admits drinking three beers earlier. Client fails HGN, one leg stand, walk and turn, finger to nose, alphabet and counting tests. Client agrees with trooper’s assessment that he has had too much to drink and that he was OUI.