What is the probability of a suspect being above a .08 BAC with two clues for the Horizontal Gaze Nystagmus (HGN) test?

What is the probability of a suspect being above a .08 BAC with two clues for the Horizontal Gaze Nystagmus (HGN) test?

• A. 65%
• B. 75%
• C. 88%
• D. 91%

Answer: (C)

The correct answer of 88% reflects the accuracy of the Horizontal Gaze Nystagmus (HGN) test as an indicator of a suspect's Blood Alcohol Concentration (BAC) level being at or above .08. The HGN test is a widely recognized field sobriety test used by law enforcement to assess potential impairment due to alcohol consumption. When two clues are observed during the HGN test—such as an inability of the eyes to smoothly track a moving object or the presence of distinct nystagmus at maximum deviation—it indicates a significant likelihood that the driver's BAC is at or above the legal limit. This 88% figure suggests a strong correlation between the performance on the HGN test and the likelihood of the driver being legally impaired, making it a useful tool for officers in the field when determining whether a suspect should undergo further testing or arrest for driving under the influence.

The correct answer of 88% reflects the accuracy of the Horizontal Gaze Nystagmus (HGN) test as an indicator of a suspect's Blood Alcohol Concentration (BAC) level being at or above .08. The HGN test is a widely recognized field sobriety test used by law enforcement to assess potential impairment due to alcohol consumption.

When two clues are observed during the HGN test—such as an inability of the eyes to smoothly track a moving object or the presence of distinct nystagmus at maximum deviation—it indicates a significant likelihood that the driver's BAC is at or above the legal limit.

This 88% figure suggests a strong correlation between the performance on the HGN test and the likelihood of the driver being legally impaired, making it a useful tool for officers in the field when determining whether a suspect should undergo further testing or arrest for driving under the influence.