When the requirement for sick leave is known to the employee in advance of their absence, the employee shall request authorization for sick leave at such time, in the manner hereinafter specified. In all other instances, the employee shall notify their supervisor as promptly as possible by telephone or other means.

The department head may require a physician’s statement from an employee who applies for sick leave. The department head may make whatever investigation into the circumstances of an employee’s request for sick leave that appears warranted before taking action on the request.