What might be one reason a DPS Trooper conducts a field sobriety test?

A DPS Trooper conducts a field sobriety test primarily to assess if a driver is under the influence of alcohol or drugs. These tests are designed to evaluate a driver's physical and cognitive abilities, which can be impaired by intoxication. By observing how a driver performs specific tasks, such as walking in a straight line or following instructions, the trooper can gather evidence to support suspicions of impairment. This process is critical for ensuring the safety of all road users, as driving under the influence significantly increases the risk of accidents. Other factors such as fatigue, mechanical vehicle issues, or passenger information are generally not the focus during such assessments, as the primary goal is to determine the driver's level of impairment.