What is standardized for evaluating impairment in SFST?

• A. Horizontal gaze nystagmus, walk-and-turn, and one-leg stand are the core tests.
• B. Breathalyzer and blood tests are the standard SFST.
• C. Vehicle maneuver tests like a zigzag and braking test.
• D. Verbal questions and memory recall.

Answer: (A)

SFST relies on a uniform set of tests to gauge impairment. The three tests in this standardized battery are Horizontal Gaze Nystagmus, Walk-and-Turn, and One-Leg Stand. Each test has prescribed procedures and scoring criteria so officers observe consistent cues of impairment, such as eye tracking issues, balance, and divided attention. Breathalyzer or blood tests measure blood alcohol content, not the impairment signs the SFST battery is designed to assess, so they aren’t the standardized SFST. Vehicle maneuvers like zigzag or braking tests aren’t part of the official SFST trio, and verbal questions or memory recall aren’t included in the standardized SFST set.