During DUI Standardized Field Sobriety Tests (SFST), which of the following is one of the tests administered?

The horizontal gaze nystagmus (HGN) test is one of the key components of the Standardized Field Sobriety Tests (SFST) used by law enforcement to assess a driver's level of impairment during a suspected DUI. This specific test evaluates the smoothness of the eyes’ tracking ability, which can indicate intoxication. When a person is under the influence of alcohol, their eye movement tends to become less coordinated and more jerky, particularly when tracking a moving object, such as a pen or a flashlight.

Administering the HGN test involves instructing the subject to follow the movement of an object with their eyes, while the officer observes for specific signs, like the onset of nystagmus (an involuntary eye movement) at certain angles. When properly conducted, this test provides objective evidence that can assist officers in making informed decisions about impairment.

The other options provided are not part of the standardized field sobriety tests. The finger-to-nose test is often used in less standardized ways but is not one of the tests officially recognized in the SFST protocol. The eye examination and breathalyzer test serve different, specific purposes, with the latter being a chemical analysis rather than a field sobriety assessment.