One of the standardized field sobriety tests (FSTs) used by law enforcement for a DUI arrest is the Horizontal Gaze Nystagmus (HGN) Field Sobriety test, often abbreviated as the HGN FST.

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 …

NHTSA | National Highway Traffic Safety Administration

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%.

Dec 14, 2022 · Horizontal gaze nystagmus (HGN) describes uncontrollable horizontal eye movements brought on by alcohol intoxication.

As such, the horizontal gaze nystagmus test is used by law enforcement agents to evaluate an individual's nystagmus in order to determine if probable cause exists for a drunk-driving arrest.

Aug 16, 2025 · What Is the Horizontal Gaze Nystagmus (HGN) Test? The HGN test observes involuntary jerking of the eyes as they follow a moving object. Officers in San Antonio, including …

Dec 23, 2025 · Standardized field sobriety tests — Horizontal Gaze Nystagmus (HGN), Walk-and-Turn, and One-Leg Stand — are used by police as observational tools to help establish probable cause for …

A properly administered Horizontal Gaze Nystagmus will have at least 14 passes of the stimulus and take a minimum of 82 seconds to complete. To learn more about the specifics necessary to properly …

Horizontal Gaze Nystagmus (HGN) is a condition characterized by involuntary, horizontal eye movements. It's a phenomenon that can be indicative of various health issues or physiological states. …