How many total clues can appear in the HGN test across both eyes?

The correct answer is significant because the Horizontal Gaze Nystagmus (HGN) test evaluates a total of six clues, which come from observing the eye movements of both eyes. Specifically, the test consists of three main indicators for each eye: the inability to track smoothly, the presence of distinct nystagmus at maximum deviation, and the onset of nystagmus prior to a 45-degree angle. Each eye is assessed separately, leading to a total of six clues when combined. Understanding this is essential for accurately interpreting the results of the HGN test during field sobriety evaluations, providing clarity on the indicators of potential impairment. This structure is outlined in the guidelines for administering the HGN test, which contributes to its reliability as a measure of intoxication.