What is the major decision of phase two in DUI detection?

The major decision of phase two in DUI detection revolves around whether to instruct the driver to step from the vehicle. This determination is crucial as it typically occurs after the officer has gathered initial observations during the first phase, which include noting the driver’s behavior and the condition of the vehicle. By asking the driver to exit the vehicle, the officer is able to conduct further evaluations, including more detailed observations of the driver's physical state and performance of standardized field sobriety tests.

This action is instrumental in confirming suspicions of impairment. Once the driver is outside the vehicle, the officer can better assess potential signs of intoxication such as balance, coordination, and the ability to follow instructions.

Other decisions, such as whether to search the vehicle or administer a breath test, may arise later in the investigation process, but determining whether to have the driver exit the vehicle is a significant step in the progression of the DUI detection process, focusing on initial observations and interactions.