What must an officer ensure before starting the SFST?

Before commencing the Standardized Field Sobriety Tests (SFST), it is crucial for an officer to ensure that the environment is safe and conducive to conducting the tests. This means that the testing area should be free from hazards, distractions, and any elements that could influence the performance of the subject or the officer. A safe and appropriate environment allows the officer to accurately observe and evaluate the subject's actions without external interruptions or dangers that could skew the results of the tests.

For instance, conducting a test on a busy roadway can introduce factors such as traffic noise or the risk of vehicles passing by, which may distract the subject or create a potentially dangerous situation. Establishing a controlled environment is therefore a fundamental aspect of the testing process, ensuring that the results are as reliable and valid as possible.

While the other options mention important considerations in the broader context of law enforcement and individual rights, they do not directly address the immediate prerequisites for executing the SFST effectively.