What is the initial step during the Horizontal Gaze Nystagmus test?

In the Horizontal Gaze Nystagmus (HGN) test, the initial step involves instructing the subject to follow a stimulus, typically a pen or finger, with their eyes. This step is crucial as it allows the officer to observe the subject's eye movements for signs of nystagmus, which is an involuntary jerking of the eyes that can indicate impairment due to alcohol or drugs.

During this portion of the test, the officer will typically ensure that the stimulus is held at the correct distance and typically at eye level, moving it smoothly and steadily horizontally, allowing them to assess the reaction of each eye to the movement. The accurate administration of the test, including this initial step, is essential for gathering reliable evidence regarding the subject's level of impairment.

Other options, such as asking the subject to close their eyes, conducting a breathalyzer test, or asking them to count backwards, do not pertain to the initial step of the HGN test and would not provide the same level of relevant information regarding eye movement and potential impairment.