What is one of the primary purposes of performing field sobriety tests during a DUI stop?

One of the primary purposes of performing field sobriety tests during a DUI stop is to establish probable cause for an arrest. When law enforcement officers suspect a driver may be under the influence of alcohol or drugs, they need to gather evidence to reinforce that suspicion. Field sobriety tests provide observable indicators of impairment, such as balance, coordination, and cognitive functioning. The results of these tests help officers make informed decisions about whether there is sufficient justification to arrest the driver for DUI.

This process is critical because it allows officers to document behavioral evidence that supports their observations and initial assessments. The successful completion or failure of these tests can significantly influence the subsequent legal proceedings, as probable cause is a crucial standard that must be met for an arrest to be legally justified.