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Articles tagged: Investigation of DUI Cases: HGN 


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Investigation of DUI Cases: HGN written by Darren Kavinoky
Horizontal Gaze Nystagmus (HGN) is an eye test. Nystagmus is defined as an involuntary jerking of the eyes as the eyes move from the center position off to the side. Alcohol and some drugs cause HGN. If administered properly, HGN is 77% determinative of the subject having a blood alcohol count (BAC) over .10 percent.

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