What is an important sign of a subject's comprehension during the SFST?

The ability of the subject to follow verbal directions accurately without confusion is a key indicator of their comprehension during the Standardized Field Sobriety Test (SFST). This assessment involves a series of instructions that require the individual to process complex information quickly and act accordingly. A subject who demonstrates clear understanding by accurately performing tasks based on verbal commands shows their cognitive function is likely intact, which can be affected by impairment from alcohol or drugs.

In the context of the SFST, following directions effectively is critical because it illustrates not just comprehension but also the ability to execute motor skills in response to those instructions. A failure to follow directions as specified can indicate potential impairment, which is a primary focus of the SFST process.