Police stop driver for speeding 46 MPH in posted 30 MPH zone. Officer notes odor of alcohol and slightly slurred speech. Driver denies drinking and refuses to participate in walk and turn and one legged stand tests due to his recent leg injury. Police officer finds 6 clues on Horizontal Gaze Nystagmus test. Defense prepared to offer medical expert to confirm recent knee injury and 37 other known causes of HGN . Booking video utilized to establish driver’s behavior, speech and demeanor at booking. Court enters required finding of not guilty at close of State’s case. Lifetime lookback reciprocity impact from MA RMV for MA resident with prior OUI history avoided.