The Horizontal Gaze Nystagmus (HGN) Field Sobriety Test checks your eyes for involuntary jerking as you gaze to the side. The test begins by the police officer placing the tested person in the instructional stance where the feet are placed together and the arms are kept to the side.

The Horizontal Gaze Nystagmus Test (HGN) is a standardized field sobriety test (FST) that police use to see if you are under the influence of alcohol or have a blood alcohol content (BAC) of .08%. During the HGN test, police study your eyes as you follow a stimulus (usually a penlight) to the left and right. How you perform on the test helps ...

Dec 14, 2022 · What is horizontal gaze nystagmus (HGN)? Nystagmus is a condition in which the eyes involuntarily move and jerk in a repeated motion. When this movement occurs in a side-to-side manner, it’s called horizontal gaze nystagmus (HGN).

Learn about the horizontal gaze nystagmus test used by law enforcement officers. For help with your DUI case, contact an attorney in your area today.

Oct 28, 2023 · Horizontal gaze nystagmus (HGN) is the involuntary jerking of one's eye when it gazes to the side. Alcohol use exaggerates this jerking motion. The HGN test is evidence of impairment in DUI cases. The following provides an overview of the science and law behind the HGN field sobriety test.

Horizontal Gaze Nystagmus (HGN) Test. Up to 35% of normal, sober individuals have a difference in pupil sizes of 0.5 mm or more, but fewer than about 10% have a difference of 1.0 mm or more. Most people with any difference in pupil sizes are aware of it. Recent onset, or no prior knowledge, can indicate a recent head injury or stroke.

Feb 15, 2025 · The Horizontal Gaze Nystagmus (HGN) test is a widely used field sobriety test conducted by law enforcement to assess potential impairment in drivers. Its proper administration is critical, as results can significantly impact DUI cases.

Dec 30, 2023 · The sobriety eye test, also known as the horizontal gaze nystagmus (HGN) test, is a common field sobriety test used by law enforcement officers to help determine if a driver is under the influence of alcohol or drugs.

Horizontal Gaze Nystagmus (HGN) Sobriety Test: Is it Reliable? The accuracy of the “follow-the-pen” test at determining whether a driver is drunk or on drugs. By John McCurley , Attorney University of San Francisco School of Law

The HGN test is one of the three field sobriety tests that are used by police officers to test if you are driving under the influence (DUI). High blood alcohol content reduces your coordination, balance and dexterity. These tests look at these three measures to find out if you are intoxicated.