horizontal gaze nystagmus test

glossary /

horizontal-gaze nystagmus test. Criminal law. A field-sobriety test for intoxication, in which the suspect is told to focus on an object (such as a pencil) and to track its movement, usu. from side to side, by moving only the eyes. • Intoxication is indicated if the eyes jerk or twitch while tracking the object. — […]

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