The Horizontal Gaze Nystagmus (HGN) Field Sobriety Test checks for involuntary jerking of the eyes as they gaze to the side.

Mar 2, 1999 · The HGN test is designed to check the eyes for one type of nystagmus – horizontal gaze nystagmus. Its results are not invalidated by virtue of the fact that other types or causes of …

Dec 15, 2022 · How is the HGN test done? The horizontal gaze nystagmus test is a part of field sobriety testing in which an officer examines a driver’s eyes and how well (or poorly) they appear to focus. …

Apr 9, 2026 · Horizontal Gaze Nystagmus (HGN) is the involuntary jerking of the eye. This movement is exaggerated by alcohol. Findlaw explains this field sobriety test.

SFST SCORING SHEET (CHECK ALL THAT APPLY) Horizontal Gaze Nystagmus: ☐ Check for eyeglasses ☐ I’m going to check your eyes. ☐ Put feet together, arms down at your side.

Horizontal Gaze Nystagmus occurs as the eyes move to the side from center point and is an involuntary jerking of the eye. Prior to the administration of this test, an officer must check a subject’s eyes for …

Aug 29, 2014 · The nystagmus evaluation is part of a three test battery of evaluations. The nystagmus testing consists of both horizontal gaze nystagmus and vertical gaze nystagmus.

Horizontal Gaze Nystagmus Test Procedure Prior to administering the horizontal gaze nystagmus test, the officer will evaluate your eyes to look for resting nystagmus, equal pupil size and equal tracking …

The Horizontal Gaze Nystagmus Test is an eye-test police administer on DUI suspects, though it is only 77% reliable and often leads to baseless charges.

Sep 22, 2025 · Key Concepts Horizontal Gaze Nystagmus, or “HGN,” refers to a jerking or stuttering type of movement observed in a person’s eyes that occurs as a result of consuming alcohol or other …