horizontal gaze nystagmus test

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

Legal Definition of horizontal gaze nystagmus test 

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

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

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