How many clues indicate a BAC above .08 for HGN?

The correct answer is based on the standardized procedures used in the Horizontal Gaze Nystagmus (HGN) test, which is part of the field sobriety testing techniques employed to assess a driver’s level of impairment due to alcohol consumption. Specifically, the HGN test evaluates how well the eyes follow a moving object horizontally, and several clues are observed to determine the likelihood that a person's Blood Alcohol Concentration (BAC) is above 0.08.

For the HGN test, there are a total of six possible clues that law enforcement officers observe during the test. However, the standard for indicating significant impairment, specifically a BAC above 0.08, is that four or more clues would strongly suggest that the individual is over the legal limit. This threshold is set because the presence of these clues reflects the impairment of the vestibular system, which alcohol affects.

Therefore, the option indicating that four clues suggest a BAC over 0.08 aligns with the standard practice and the training that officers receive regarding how to interpret the results of the HGN test effectively. This threshold helps ensure that law enforcement can make informed and justifiable decisions during DUI investigations.