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Why did the police officer make me stand on one leg, walk a line, and follow his pen with my eyes?

April 26, 2017eyes Follow leg line officer Pen police stand walk

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Why did the police officer make me stand on one leg, walk a line, and follow his pen with my eyes?

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Police use these Field Sobriety tests against you in court to show that you were impaired to drive. They don’t tell you that these tests are voluntary and that you do not have to take them. Of the three field tests, only the Horizontal Gaze Nystagmus (HGN) has been deemed scientific in Georgia. The theory behind the HGN is that a person who is impaired due to alcohol will have his/her eyes jerk (nystagmus) at certain points while following a pen or finger.