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The Horizontal Gaze Nystagmus (HGN) test is a field sobriety test often used by law enforcement to assess a person's level of impairment, particularly under the influence of alcohol. During this test, the officer looks for distinct clues that indicate impairment based on the movement of the individual's eyes.

In total, there are six specific clues that can be observed during the HGN test. These clues include:

1. The inability to follow a moving object smoothly (which indicates a lack of muscle control).

2. The distinct nystagmus at maximum deviation (the point where the eye is turned as far as it can go).

3. The onset of nystagmus prior to a 45-degree angle (indicating early onset of eye tremors).

Each of these clues is critical because they help the officer build a case for determining whether a person may be under the influence of alcohol or drugs. The systematic observation of these six clues provides a standardized method for evaluating a suspect's eye movement and potential impairment.

Correctly understanding that there are six clues enhances the reliability of the HGN test and informs law enforcement's decision-making processes when assessing drivers for potential intoxication.