SFST One Leg Stand 3

Question 1

What counting method is the subject instructed to use during the OLS test?

Accepted Answer

Count out loud in the format 'one-thousand-one, one-thousand-two...'

Answer

Subjects are instructed to count out loud saying 'one-thousand-one, one-thousand-two' up to 'one-thousand-thirty' so the officer can time the 30-second period.

Question 2

A person with a leg injury causing an uneven gait is asked to perform the OLS. What is the best course of action?

Accepted Answer

Do not use OLS; rely on other validated tests or observations

Answer

Physical impairments that affect balance, such as leg injuries, can invalidate OLS results; officers should note the condition and use alternative assessments.

Question 3

During OLS, the officer times the subject for 30 seconds. When should the officer tell the subject to stop?

Accepted Answer

When the officer's 30-second stopwatch expires

Answer

The officer controls the 30-second duration using a stopwatch and instructs the subject to stop when the time is reached, regardless of the subject's counting.

Question 4

Two OLS clues are generally considered the threshold for indicating impairment. What percentage of impaired drivers (BAC ≥ 0.10) show two or more clues according to NHTSA research?

Accepted Answer

83%

Answer

NHTSA research found that 83% of subjects with a BAC of 0.10 or greater exhibited two or more OLS clues.

Question 5

During the OLS instruction phase, the officer tells the subject to keep arms at their sides. Why is this instruction critical?

Accepted Answer

It establishes a baseline behavior so any deviation can be scored as a clue

Answer

Instructing the subject to keep arms at their sides sets the behavioral baseline so that raising arms beyond 6 inches can be identified and scored as a clue.

(SFST) Standardized Field Sobriety Testing Certified Practice Test

(SFST) Standardized Field Sobriety Testing Certified Practice Test

SFST One Leg Stand 3