What does a field sobriety test typically involve?

A field sobriety test typically involves standardized physical coordination tasks designed to assess a driver's ability to perform basic physical functions that are often impaired by alcohol or drugs. These tests include exercises such as the walk-and-turn, one-leg stand, and horizontal gaze nystagmus test. They gauge the suspect's balance, coordination, and ability to follow instructions, which can help law enforcement officers determine if a driver is under the influence.

The focus on physical coordination is crucial, as alcohol impairs motor skills and cognitive processing. By observing how well a person can perform these tasks, officers can gather evidence that supports their suspicion of impaired driving. This approach is more effective for assessing impairment in real time compared to other methods, such as blood sampling or interviews about driving history, which do not provide immediate insight into a person's current state.