Defensive Tactics to OWI Trials/Cross Examination of Arresting Officer. Patrick HarringtonTippecanoe County Prosecutor. 3 Standard Field Sobriety Tests. The Horizontal Gaze Nystagmus (HGN)The Walk and TurnThe One Leg Stand. Standardization is Critical. The tests are administered in the prescribed, standardized mannerThe standardized clues are used to assess the suspect\'s performanceThe standardized criteria are employed to interpret the performance.