Which environmental factors can potentially affect SFST performance?

Weather conditions, lighting, and surface conditions are critical environmental factors that can greatly influence the performance of Standardized Field Sobriety Tests (SFST). These tests are designed to assess a person's sobriety and coordination, and variations in the environment can significantly impact the results.

For instance, if the weather is poor—such as being rainy or windy—it can affect a subject's ability to maintain balance, particularly during tests that require standing or walking in a straight line. Similarly, insufficient or harsh lighting can impair visibility, making it harder for individuals to perform tasks that require precision, such as following the officer’s finger with their eyes. Surface conditions—like uneven ground or slippery surfaces—can also introduce challenges, as they may hinder a person’s stability and control, directly influencing their performance on the tests.

In contrast, while factors like clothing choices, stress levels, the time of day, and the presence of other individuals may have some influence on an individual's performance, they are not as directly impactful on the standardized procedures of the SFST as the environmental conditions described.