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Dayton DUI Attorney Charles Rowland > Posts tagged "hgn 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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