What is the role of body language during SFST observations?

The role of body language during SFST observations is significant as it provides additional clues about a subject's state of mind or potential impairment. Non-verbal cues such as posture, movements, and facial expressions can indicate levels of intoxication or impairment. For instance, a subject who is unable to maintain balance, sways, or exhibits unusual movements may show signs of impairment due to alcohol or drugs. Observing body language helps officers assess the overall condition of the subject beyond just the performance of the tasks involved in the sobriety tests. This multifaceted approach enhances the ability to make informed decisions regarding the subject's sobriety and potential need for further action.

While nervousness and confidence levels are related to body language, they do not serve the primary purpose of assessing impairment or state of mind as effectively as the comprehensive observation of all body language indicators.