FindLaw Legal Dictionary
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term:
Horizontal Gaze Nystagmus Test
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horizontal gaze nystagmus test n
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a test for intoxication (as of a driver) based on observation of involuntary jerking movements of the eyes as they follow horizontal motion
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.