Horizontal Gaze Nystagmus in Maryland

When an officer administers the Horizontal Gaze Nystagmus test on a driver suspected of driving while intoxicated, the driver must track a moving object (officer’s finger, pen, light, etc.) with his/her eyes while keeping his/her head stationary. The officer will watch for a wobble or jerk in the eye (nystagmus) as it follows the stimulus…