HOW ACCURATE IS THE HORIZONTAL GAZE NYSTAGMUS TEST?

While not foolproof, the Horizontal Gaze Nystagmus Test is considered to be the most reliable of the three field sobriety tests for detecting impairment. During the test, an officer will ask the driver to follow a pen or other object with their eyes while keeping their head still. The officer will look for any involuntary jerking of the eyes, which is a sign of impairment. In Georgia, if a driver fails the HGN test, it can be used as evidence of impairment in court. 

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