How many inches should the stimulus be held from the suspect's face when administering the HGN
test?
12-15 inches
What is the minimum number of seconds that the stimulus should be held when checking for
nystagmus at maximum deviation?
4
What is the minimum pace (in seconds) that the stimulus should move when checking for the onset
of nystagmus prior to 45 degrees?
4
What is the recommended order that the SFST's should be administered?
HGN, walk-and-turn, one leg stand
, True or False: If any one of the standardized field sobriety test elements is changed, the validity is
compromised.
True
Which type of nystagmus is an indicator of high BAC level for the impaired person OR an indication
that they are under the influence of drugs?
Vertical Gaze Nystagmus
How many total clues in the HGN are needed to indicate a test failure?
4 out of 6
Based upon the original research, how accurate is HGN?
77% for .10 and 88% for .08
test?
12-15 inches
What is the minimum number of seconds that the stimulus should be held when checking for
nystagmus at maximum deviation?
4
What is the minimum pace (in seconds) that the stimulus should move when checking for the onset
of nystagmus prior to 45 degrees?
4
What is the recommended order that the SFST's should be administered?
HGN, walk-and-turn, one leg stand
, True or False: If any one of the standardized field sobriety test elements is changed, the validity is
compromised.
True
Which type of nystagmus is an indicator of high BAC level for the impaired person OR an indication
that they are under the influence of drugs?
Vertical Gaze Nystagmus
How many total clues in the HGN are needed to indicate a test failure?
4 out of 6
Based upon the original research, how accurate is HGN?
77% for .10 and 88% for .08
