Police officers swear the eyes never lie, at least when it comes to the horizontal gaze nystagmus exam.
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The test is routinely used by police officers who suspect a driver is drunk as part of the field sobriety exam. It involves having a suspect follow a small object, such as a pen, with their eyes as the officer slowly moves it horizontally in front of them. The suspect is asked to do so without moving his or her head.
What the officer watches for is an involuntary jerking of the eyes, which is referred to as a nystagmus.
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