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The significant differences between 3 groups were found for Unterberger, HTT, DVA and gaze nystagmus tests.
The horizontal gaze nystagmus test involves asking a subject to focus on an object such as a pen held about a foot away, just above eye level, and to follow the object as the test administrator moves it from side to side.
The court held, inter alia, that the issue in the case was whether a report of a person driving under administered narcotics, and the failure of a horizontal gaze nystagmus test is sufficient evidence for a police officer to make a stop and/or arrest for driving under the influence.
ENG testing included calibration, identification of spontaneous nystagmus and gaze nystagmus, positional tests, Dix-Hallpike maneuvers (unless contraindicated because of neck pathology), sinusoidal tracking, optokinetic testing and, in selected patients, alternate binaural bithermal caloric testing (right warm [RW]; right cool [RC]; left warm [LW]; left cool [LC]).
For example, the horizontal gaze nystagmus test, one of the "standardized" battery of field sobriety tests used in most states, is of questionable value in determining a person's sobriety, and few police officers can administer it or interpret its results correctly.
features (such as lateral gaze nystagmus) may be present."[7]
Drivers are asked to recite the alphabet, stand on one leg, complete a nine-step heel-to-toe walk and watch as a pen is moved in front of them as part of a horizontal gaze nystagmus test.