Which set of tests are commonly used as standard field sobriety tests to detect impairment?

• A. Breathalyzer, blood test, urinalysis
• B. Horizontal gaze nystagmus, walk-and-turn, and one-leg stand
• C. Fingerprint comparison, handwriting analysis
• D. Visual acuity and depth perception

Answer: (B)

Standard field sobriety testing focuses on observable indicators of impairment that can be checked on the roadside, especially balance, coordination, and eye-tracking. The set that officers commonly rely on for this purpose is horizontal gaze nystagmus, walk-and-turn, and one-leg stand. These tests were developed and validated to be administered consistently in the field and to provide measurable clues about impairment, helping determine whether an arrest and further testing are warranted. The other options don’t fit because they involve chemical analyses (breath, blood, urinalysis) used to quantify alcohol content in a lab or on-scene, or they involve forensic identification or basic visual tasks that aren’t standardized impairment assessments.