The horizontal gaze nystagmus (HGN) test is a common field sobriety test used by law enforcement to assess potential impairment. The test involves an officer observing a subject’s eyes as they follow a moving object, usually a pen or finger, from side to side. Nystagmus, an involuntary jerking of the eyes, is naturally present to some degree at extreme angles of gaze. However, the presence of nystagmus at earlier angles, or a more pronounced jerking motion, can indicate impairment due to alcohol or certain drugs. The premise behind strategies aimed at influencing the outcome of this test centers on attempting to control or minimize the observable nystagmus, which is often challenging given the involuntary nature of the response.
The test’s significance lies in its standardized administration and interpretation within the context of DUI/DWI investigations. Historically, the HGN test has been admitted as evidence in court, contributing to probable cause for arrest and potentially influencing legal proceedings. While the scientific basis of the HGN test has been debated, its continued use highlights its perceived value by law enforcement. The ability to influence the perception of sobriety during this test could potentially mitigate the immediate consequences of a traffic stop. It’s important to acknowledge that engaging in any strategy to misrepresent one’s condition during a traffic stop carries legal and ethical implications.
