What are field sobriety tests designed to do?

Field sobriety tests are specifically designed to assess a driver’s level of impairment, particularly regarding alcohol or drug influence. These tests evaluate various physical and cognitive abilities, such as balance, coordination, and attention. Typical tests include the Horizontal Gaze Nystagmus, Walk-and-Turn, and One-Leg Stand, which help law enforcement officers observe signs of intoxication.

The focus of field sobriety tests is not on the vehicle’s mechanics or compliance with registration laws, nor do they measure the speed of the vehicle. Instead, they provide immediate evidence regarding a driver’s ability to operate a vehicle safely under the influence. This information aids officers in making informed decisions about whether to arrest a driver for DUI (driving under the influence) or other related offenses.