If an officer suspects a driver is under the influence, what should they do first?

The appropriate first step when an officer suspects a driver is under the influence is to perform standardized field sobriety tests. This set of objective tests allows the officer to assess the driver's physical and mental coordination, balance, and ability to follow instructions, which are crucial indicators of impairment. The results help determine whether probable cause exists to arrest the driver for driving under the influence.

Performing these tests first is essential because it provides a structured and legally recognized method for evaluating impairment, which can be critical in court if charges are pursued. It also helps ensure that any subsequent actions, such as arresting the driver or conducting a vehicle search, are based on evidence gathered from the sobriety tests rather than speculation or assumption. This approach aligns with established protocols aimed at ensuring fairness and accuracy in enforcement actions.