Which of the following tests is classified as a chemical test rather than a field sobriety test?

The breath specimen test is classified as a chemical test because it analyzes a person's blood alcohol concentration (BAC) through the breath they exhale. This method provides quantitative data that can legally determine intoxication levels. Chemical tests, such as blood, urine, or breath tests, measure the actual presence of alcohol or drugs in the system, establishing more concrete evidence than physical coordination tests.

In contrast, the walking test, touching the nose test, and horizontal gaze nystagmus test are all types of field sobriety tests. These tests assess a person's physical and cognitive abilities through observable behavior, such as balance, coordination, and visual tracking. While these tests can indicate impairment, they do not provide a direct measurement of intoxication, making them less definitive compared to chemical tests like the breath specimen test.