Police officer watches car fail to come to a complete stop at Stop sign and then fail to yield the right of way to his unmarked cruiser. After stop driver denies drinking, but officer notes odor of alcohol from the car and driver’s slurred speech and red eyes. Driver is 6/6 on HGN, 5/8 on Walk and Turn but passes One Leg Stand Test. Driver refuses post arrest breath test. DUI charge dismissed prior to trial.