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horizontal gaze nystagmus test Tag

Dayton DUI Attorney Charles Rowland > Posts tagged "horizontal gaze nystagmus test"

HGN Test Doomed By Lack Of Training

HGN Test Doomed By Lack Of Training According to their own manual, the HGN test, Horizontal Gaze Nystagmus, is the most reliable of the three standardized field sobriety tests.  The police are trained that it is 77% accurate at detecting subjects at or above a .10% blood alcohol concentration.  But that is not the whole story.Officers are not told that everyone (EVERYONE) has nystagmus. The presence of alcohol merely enhances or magnifies this natural effect. In addition, they are instructed that there are 40 different kinds of nystagmus. Yes, everyone - but that is somehow not important to their training. The fact...

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What Is A Horizontal Gaze Nystagmus Test?

What is the Horizontal Gaze Nystagmus Test? Alcohol is a central nervous system depressant affecting many of the higher as well as lower motor control systems of the body. This results in poor motor coordination, sluggish reflexes, and emotional instability. The part of the nervous system that fine-tunes and controls hand movements and body posture also controls eye movements. When intoxicated, a person's nervous system will display a breakdown in the smooth and accurate control of eye movements. This breakdown in the smooth control of eye movement may result in the inability to hold the eyes steady, resulting in a number...

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