How many times should the officer check each eye during the HGN test?

The correct answer is grounded in the standardized procedures used during the Horizontal Gaze Nystagmus (HGN) test, which is a key part of the field sobriety testing protocol. The officer should check each eye a total of six times to thoroughly assess the presence of all three clues associated with HGN.

The three clues are:

1. Lack of smooth pursuit (checking how smoothly the eye can follow an object)

2. Distinct and sustained nystagmus at maximum deviation (observing the eye at the farthest point)

3. Onset of nystagmus prior to 45 degrees (noting the point at which nystagmus starts before the eye reaches the perpendicular angle).

By evaluating each eye for these indicators three times, the officer ensures a comprehensive assessment. This systematic approach allows for accurate observation and can help in determining whether the individual is under the influence of alcohol or another substance. Checking each eye multiple times enhances the reliability of the test results, making it a vital component of effective DUI enforcement.