Which chemical test is NOT typically used to determine impairment?

The identification of the eye exam as the correct choice highlights the distinction between physiological evaluations and chemical tests used to determine impairment. Typically, chemical tests involve the analysis of biological samples for substances such as alcohol or drugs that can indicate impairment. These tests include blood, breath, and urine tests, all of which measure the presence and concentration of impairing substances.

In contrast, the eye exam focuses on observable physical responses—such as pupil reaction and tracking movements—to assess impairment. While it can certainly indicate whether an individual may be impaired, it does not chemically analyze substances in the body. Therefore, it does not fit into the category of chemical tests that provide quantifiable data regarding the level of impairment due to substances. This makes the eye exam unique among the other listed options, which are all specific forms of chemical testing.