Which of the following is included in the SFST for determining impairment?

The correct answer focuses on the standardized field sobriety tests (SFST) that are specifically designed to assess an individual's impairment, particularly in relation to driving under the influence. The "Walk and Turn" test is a crucial component of these assessments. This test evaluates an individual’s balance, coordination, and ability to follow instructions, which are vital skills for safe driving.

During the "Walk and Turn" test, the subject is asked to take a series of steps along a straight line, pivot, and walk back. The officer observes the individual's ability to maintain balance, begin the test correctly, and complete it without making errors. These observations provide critical indicators of potential impairment, as alcohol and drugs can significantly affect motor skills and cognitive functions necessary for driving.

The other choices, while they relate to assessments of impairment, do not specifically refer to the standardized field sobriety tests. Vertical gaze nystagmus assesses how the eyes respond to smooth movement, which can show impairment but is not a walking test. Breath observation typically refers to assessing a breathalyzer reading rather than physical coordination. Reaction time assessment can be a factor in overall impairment but is not a distinct SFST component. Thus, the "Walk and Turn" is the relevant test that identifies physical coordination