Articles tagged: Investigation of DUI Cases: HGN
<< previous page 1 next page>> 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. << previous page 1 next page>> |