A structured field sobriety test should be simple and what?

A structured field sobriety test is designed to assess a person's ability to perform tasks that can indicate impairment. While the focus on simplicity is important, the key component of these tests is that they should effectively challenge the individual's ability to divide their attention. This aspect is crucial because alcohol and drugs impair cognitive functions, including the ability to focus on multiple tasks simultaneously.

By requiring the subject to perform tasks that divide their attention—such as maintaining balance while following instructions—officers are better able to evaluate impairment. Tests that effectively divide attention help to gather evidence of impairment in a way that is observable and can be justified in legal settings.

The other options, while they may seem relevant, do not capture the primary goal of the structured field sobriety tests as clearly. Simplicity, speed, and the duration of the test are important, but the ability to evaluate divided attention is what makes the test comprehensive and relevant to assessing impairment.