The DUI Eye Test
The Horizontal Gaze Nystagmus (HGN) is to test the ability to follow an object smoothly at different angles. Nystagmus can only be spotted by a doctor but alcohol and other stimulants increase jerking movements of the eye. Not only people under the influence of alcohol can exhibit symptoms of HGN; head trauma, neurological disorders and certain medications can show symptoms. There are many reasons for failure on this test, please speak with your local attorney to go over other reasons or mistakes in police interpretation.
The Eye Test
When the test is administered the officer is looking for jerking movement while moving the stimulus horizontally across the vision scope. Stimulus includes a finger, pen or light. The officer will ask you to stand with your feet together arms at your side. You’re going to be asked a series of “Do you understand?” after each instruction. Then the officer will do a demonstration of moving the stimulus, usually finger horizontally watching for distinct clues of impairment. Some clues are jerking of the eye at each corner of vision. Finally, the officer administers the test and watches for fluidity in eye movements. Officers have to be specially trained in many states in order for this test to hold credibility in court. It is up to the officer to administer this test correctly for HGN to be pertinent to the case.
If you are accused for DUI and have been administered this test, please consult a local area DUI defense attorney for further information. DWI and DUI traffic stop advice here.
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