High risk jobs such a fire fighters, police officers, and employees that work in remote, hostile environments can be required to undergo a FFD examination at regular time intervals. In other words, there must be a business necessity for conducting regular FFD examinations on an incumbent work force. For regular jobs, FFD exams can be legally conducted on a “for cause basis” when an employee’s health status has changed and he/she is having difficulty working in a safe manner, or when an employee is transferred to a more physically demanding job.