HGN Test in a DUI Stop

HGN Test in DUI Arrest The Horizontal Gaze Nystagmus is a commonly used field sobriety test.  It is also known as the pen test.  Nystagmus is the involuntary jerking of a person’s eye when they gaze to one side.  Impaired subjects exhibit more pronounced jerking or bouncing.  Alcohol is a central nervous system (CNS) depressant…