DWI / SFST NHTSA EXAM QUESTIONS WITH VERIFIED ANSWERS| LATEST UPDATE GRADED A+
HORIZONTAL GAZE NYSTAGMUS TEST EQUAL PUPIL SIZE
EQUAL TRACKING
1.) LACK OF SMOOTH PURSUIT
2.) DISTINCT & SUSTAINED NYSTAGMUS AT MAXIMUM DEVIATION
3.) ONSET OF NYSTAGMUS PRIOR TO 45 DEGREES
NON-SCIENTIFICALLY VALIDATED: (VGN) VERTICAL GAZE NYSTAGMUS
4 out of 6 clues HGN 88%
2 out of 8 clues Walk & Turn 79%
2 out of 4 clues One Leg Stand 83%
WALK AND TURN (Procedures) 9 Heel to toe steps on straight line (1/2in) turning around 9
heel to toe steps back
Must keep eyes on feet, Count out loud, arms at the side (6 inches max) once started cannot
stop.
ONE LEG STAND (Procedures) Foot Approx. 6 inches off ground, both legs straight, foot
parallel to ground and pointed out. Eyes on the foot, arms at the side, counting 1,001, 1,002,
1,003 till told to stop. Check watch
3 categories of drugs that may cause HGN in a subject CNS depressants (including alcohol)
Inhalents
Dissociative Anesthetics
HORIZONTAL GAZE NYSTAGMUS TEST EQUAL PUPIL SIZE
EQUAL TRACKING
1.) LACK OF SMOOTH PURSUIT
2.) DISTINCT & SUSTAINED NYSTAGMUS AT MAXIMUM DEVIATION
3.) ONSET OF NYSTAGMUS PRIOR TO 45 DEGREES
NON-SCIENTIFICALLY VALIDATED: (VGN) VERTICAL GAZE NYSTAGMUS
4 out of 6 clues HGN 88%
2 out of 8 clues Walk & Turn 79%
2 out of 4 clues One Leg Stand 83%
WALK AND TURN (Procedures) 9 Heel to toe steps on straight line (1/2in) turning around 9
heel to toe steps back
Must keep eyes on feet, Count out loud, arms at the side (6 inches max) once started cannot
stop.
ONE LEG STAND (Procedures) Foot Approx. 6 inches off ground, both legs straight, foot
parallel to ground and pointed out. Eyes on the foot, arms at the side, counting 1,001, 1,002,
1,003 till told to stop. Check watch
3 categories of drugs that may cause HGN in a subject CNS depressants (including alcohol)
Inhalents
Dissociative Anesthetics
