HGN Test | Horizontal gaze nystagmus | HGN | Nystagmus Test | Horizontal gaze nystagmus test

HGN Test | Horizontal gaze nystagmus | HGN | Nystagmus Test | Horizontal gaze nystagmus test

Horizontal Gaze Nystagmus Test-field sobriety test-sobriety test-DUI eye test-nystagmus test-gaze nystagmus

The Horizontal Gaze Nystagmus Test, or the HGN evaluation, is a field sobriety test that is part of the NHTSA Standardized Field Sobriety Tests. HGN is just one field sobriety tests. There are MANY nystagmus causes, not just alcohol. This article, and the links within this article will convince you to never take a field sobriety test.

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What is nystagmus test DUI? - Atlanta DUI lawyer William C (Bubba) Head explains the false science surrounding all field sobriety test exercises (see below).

Police officers are trained to perform an eye test [including the HGN or the "horizontal gaze nystagmus test"] as part of the Standardized Field Sobriety Tests. Nystagmus is an involuntary jerking of the eye that CAN be caused by central nervous system depressants. But, gaze nystagmus or saccadic movements in the eye (when following at an angle) can be caused by over 40 other sources. Officers look for clues or "cues" under the original DWI manual.

Cops take a three day sobriety test class designed to teach them how to make better arrest decisions. 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. To see an example of vertical gaze nystagmus, watch this YouTube video:    • Vertical gaze nystagmus test-HGN test...  

Proper police training requires Standardized Field Sobriety Test subjects to be dosed with a quantity of alcohol by the instructors.

The National Highway Transportation Safety Administration (NHTSA) publishes a manual with the three Standardized field sobriety tests [the Horizontal Gaze Nystagmus or HGN, the Nine Step Walk and Turn (WAT), and the One Leg Stand (OLS)] to help cops determine whether a DUI-DWI-OUI-OWI suspect has blood alcohol content that may be over the legal limit (0.08 grams per cent for all adult drivers who are not operating a commercial motor vehicle.)

This peer-reviewed scientific article castigates HGN and VGN as proof of impairment:
The Horizontal Gaze Nystagmus test is used by law enforcement agencies in the United States to determine whether drivers are intoxicated. Video tapes recorded by cameras in police vehicles revealed that police officers rarely comply with the minimum requirements of the nystagmus examination procedures for which they were trained and certified.
Dr. J.L. Booker, Ph.D.
http://www.ncbi.nlm.nih.gov/pubmed/11...

Law enforcement officers are trained to administer the so-called Standardized Field Sobriety Tests on people detained after being suspected of DUI-DWI-OUI-OWI.The proper 20 to 24 hours of instruction requires SFST subjects to be dosed with some amount of alcohol by the instructors, before a student attempts to properly identify what is nystagmus and what is not nystagmus. The officers would retest the same subject 2 weeks later.

The National Highway Traffic Safety Administration (NHTSA) prints manuals explaining the three Standardized field sobriety tests [the Horizontal Gaze Nystagmus or HGN, the Nine Step Walk and Turn (WAT), and the One Leg Stand (OLS)]. This manual is required for every practitioner student. By keeping the manual, it can be referred to in order to help cops reliably determine who to arrest and who to not arrest during field tests. The purpose of devising these tests was to determine if it is likely that a DUI-DWI-OUI-OWI suspect was too drunk to drive, based upon the cues or clues from the evaluation.

To locate a hand-picked horizontal gaze nystagmus expert attorney (trained in the Standardized Field Sobriety Test protocols) Field Sobriety go you the web site: http://www.teamdui.com/field-sobriety...

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Blood alcohol calculator video:    • Blood Alcohol Calculator-Blood Alcoho...  

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Contact Mr. Head at:
William C. Head, Atlanta DUI Lawyer
404-567-5515
5590 Roswell Road
Suite 210
Sandy Springs GA 30342