SFST HGN Test 3

Question 1

When administering the HGN test, the officer should position the stimulus how far in front of and above the subject's eyes?

Accepted Answer

6–8 inches in front, slightly above eye level

Answer

NHTSA guidelines specify holding the stimulus 6–8 inches from the subject's nose and slightly above eye level to keep the eyes in a natural position.

Question 2

Which of the following correctly describes the recommended speed for moving the stimulus during the Lack of Smooth Pursuit check?

Accepted Answer

Four seconds from center to the edge of each eye

Answer

NHTSA instructs the officer to take approximately four seconds to move the stimulus from center to the maximum deviation of each eye during the smooth pursuit check.

Question 3

Vertical Gaze Nystagmus (VGN) during the HGN test is associated with which condition?

Accepted Answer

High BAC or influence of certain depressants

Answer

VGN typically appears at higher BAC levels or with depressant drugs, making it an indicator of significant impairment.

Question 4

A subject wears contact lenses during the HGN test. What should the officer do?

Accepted Answer

Note that contacts are present but continue the test normally

Answer

Contact lenses do not affect the validity of the HGN test; the officer notes their presence in the report and proceeds normally.

Question 5

An officer observes 4 out of 6 HGN clues. According to NHTSA research, this result suggests:

Accepted Answer

There is a high probability the subject's BAC is 0.08 or above

Answer

NHTSA research indicates that four or more HGN clues correlate with a BAC of 0.08 or higher with approximately 88% accuracy.

(SFST) Standardized Field Sobriety Testing Certified Practice Test

(SFST) Standardized Field Sobriety Testing Certified Practice Test

SFST HGN Test 3