3-6C-9. Advanced sick leave. Sick leave may be advanced to a permanent employee who has been in regular continuous employment of the state for at least one full year if the employee has used all of the employee's accrued vacation and sick leave. If an employee receives advanced sick leave, any subsequent sick leave accrued by the employee shall be credited against the employee's negative sick leave balance until the advanced sick leave is repaid. The employee's advanced negative sick leave balance may not exceed two hundred twenty-eight hours. Advanced sick leave is within the discretion of the bureau under rules promulgated by the commission pursuant to chapter 1-26, and is authorized only if the bureau's consent has first been obtained.