There is a Sick Leave Reserve. The Secretary shall administer the Sick Leave Reserve. The Secretary shall adopt rules and regulations about the eligibility of police employees to withdraw sick leave from the Sick Leave Reserve including: a requirement that the police employee have a long–term illness and be unable to work; and the length of time for which a police employee may receive sick leave. With the approval of the Secretary, a police employee may donate up to 2 days of sick leave each year to the Sick Leave Reserve. The Secretary may transfer days of sick leave that have been accumulated in the Sick Leave Reserve to a police employee who: has a documented medical disability; and has exhausted all forms of leave. The Secretary may not transfer sick leave under this section to a police employee who has been granted disability retirement by the board of trustees of the State retirement systems for use after the first date on which disability retirement may become effective.