Field Sobriety Tests are a series of physical and cognitive assessments used by law enforcement to determine if a driver is impaired, often due to alcohol or drugs. These tests typically include tasks like walking in a straight line, standing on one leg, and following a moving object with the eyes. The results of these tests help officers decide whether to arrest a driver for suspected DUI (Driving Under the Influence). While these tests can indicate impairment, they are not always definitive, as various factors like age, health, and environmental conditions can affect performance.