How can environmental factors impact the SFST?

Environmental factors can significantly disrupt the accuracy of the Standardized Field Sobriety Test (SFST). These factors include things like weather conditions, surface type, distractions in the environment, and lighting. For example, slippery surfaces can affect the performance of the walk-and-turn or one-legged stand tests by increasing the likelihood of losing balance, which could lead to a false indication of impairment. Additionally, poor lighting can make it difficult for the officer to accurately observe the subject’s movements or assess their performance on the tests. Therefore, environmental factors can introduce variables that may compromise the reliability of the test results, making it crucial for officers to consider these aspects during the evaluation process.