The document outlines the third phase of the DWI detection process, where officers administer field sobriety tests to assess a driver's impairment and probable cause for arrest. It details various tests, including the horizontal gaze nystagmus and walk-and-turn tests, as well as factors that may indicate impairment such as weaving and swerving. Additionally, it provides procedural guidelines for documenting observations, test results, and the administration of breath tests for alcohol concentration.