Law Dictionary

horizontal gaze nystagmus test

noun horizontal gaze ny·stag·mus test \-ni-ˈstag-məs-\

Legal Definition of horizontal gaze nystagmus test

  1. :  a test for intoxication (as of a driver) based on observation of involuntary jerking movements of the eyes as they follow horizontal motion

Additional Notes on horizontal gaze nystagmus test

This test is one of several usually administered by police officers to determine the sobriety of a suspected drunk driver.

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feeling or affected by lethargy

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