Which of the following is NOT one of the clues assessed in the HGN test?

The HGN (Horizontal Gaze Nystagmus) test is a standardized field sobriety test that assesses an individual's eye movement as a way to determine potential intoxication, particularly in relation to alcohol consumption. The test involves evaluating specific eye movement characteristics, and the first three clues listed are key indicators used during the evaluation.

"Excessive head movement" is not one of the primary clues assessed in the HGN test. Instead, the test focuses on three primary indicators: lack of smooth pursuit, distinct and sustained nystagmus at maximum deviation, and onset of nystagmus prior to 45 degrees. Each of these indicators reflects different types of eye movement that are influenced by the consumption of alcohol and help law enforcement officers determine the likelihood of impairment.

By focusing on these eye movement characteristics, the HGN test provides vital information regarding a person's level of impairment, but lacks the assessment of head movement, which is not directly related to the physiological responses that the HGN test is designed to measure.