October 29, 2015

DWI Detection and Standardized Field Sobriety Testing Session 7 – Phase Three: Pre-Arrest Screening Horizontal Gaze Nystagmus Demonstration

DWI Detection and Standardized Field Sobriety Testing
Session 7 – Phase Three: Pre-Arrest Screening
Horizontal Gaze Nystagmus
Demonstration
7-10
To test for Horizontal Gaze Nystagmus, the subject is instructed to stand with feet
together, hands at sides, hold the head still, and follow the motion of a stimulus with the
eyes only.
The object may be the tip of a pen or penlight or the eraser on a pencil, which contrasts
with the background.
Each eye is checked, beginning with the subject's left. A subject's height might restrict
ability to clearly see nystagmus. Subject may be placed in sitting position to
accommodate a better view.
Two or more "passes" are made before each eye, to look for each of the clues of
nystagmus.
Subject height may restrict ability to see nystagumus in those cases, a sitting position
may work.
DWI Detection and Standardized Field Sobriety Testing
Session 7 – Phase Three: Pre-Arrest Screening
The Truth is in the Eyes
HGN Video
7-11
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HS 178 R5/13 7 of 26Source: DWI Detection and
Standardized Field
Sobriety Testing
March 2013 Edition

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