SFST Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

SFST Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the main purpose of the Standardized Field Sobriety Tests? To help officers determine whether a driver is impaired based on physical and cognitive indicators. What are the three validated SFSTs used during DUI investigations? Horizontal Gaze Nystagmus, Walk-and-Turn, and One-Leg Stand. Why is it important to give clear instructions before beginning any SFST? So the subject understands exactly what is expected, ensuring accurate results. What is horizontal gaze nystagmus? An involuntary jerking of the eyes that becomes more noticeable when a person is impaired by alcohol. Why must the subject's head remain still during the HGN test? To accurately observe the eye movement without interference. 2 What is the minimum distance the stimulus should be held from the subject’s nose during HGN? Approximately 12 to 15 inches. Why should an officer check for equal pupil size and resting nystagmus before the HGN test? To rule out medical or neurological conditions. How many clues are there in the Walk-and-Turn test? Eight validated clues. What surface should be used for the Walk-and-Turn test? A dry, hard, non-slippery, level surface. Why does the Walk-and-Turn test require a heel-to-toe stance during instructions? To divide attention and observe balance before the test begins. How many steps should be taken in the Walk-and-Turn test? Nine heel-to-toe steps in each direction. 3 What does it mean if the subject steps off the line during the Walk-and-Turn test? It may indicate a clue of impairment. How many clues are there in the One-Leg Stand test? Four validated clues. Why is time a critical factor in the One-Leg Stand test? Because the subject must count out loud for 30 seconds, challenging concentration and balance. What should the subject do if they lose balance during the One-Leg Stand test? Attempt to continue unless told otherwise. Why must SFSTs be administered in a standardized way every time? To maintain reliability and validity in court and enforcement decisions. What does the term “standardized” mean in SFSTs? 4 That the tests must be conducted the same way by all officers for consistent results. What is the role of divided attention in SFSTs? It simulates driving by requiring focus on both mental