What is a common error officers make during HGN testing?

Rushing through the test is a common error officers make during HGN testing because it can lead to inaccurate observations and assessments. The HGN test requires a careful and methodical approach to ensure that the results are valid. When officers rush, they may miss crucial indicators of impairment, such as the presence of nystagmus or the lack of smooth pursuit in the subject's eye movements. A thorough and unhurried execution of the test allows officers to accurately assess the eye movement characteristics that are indicative of possible intoxication, leading to more reliable outcomes in DUI evaluations.