This is usually the first test that the police officer will perform. The reason is that most police officers believe the HGN test is the most accurate indicator. For this test, the police officer will ask the DUI suspect to stand up straight and keep his or her head still. The officer will then ask the DUI suspect to follow the pen or the light with their eyes only. The police officer is trying to see if the DUI suspect’s eyes move smoothly, is able to follow the pen, and if the eyes jerk back to the middle.
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