The Leave Bank consists of donated leave and forfeited annual, personal, and sick leave. An employee is a member of the Leave Bank for 2 years from the date on which the employee: voluntarily donates at least 8 hours of annual, personal, or sick leave to the Leave Bank in accordance with this title; or has at least 8 hours of annual or personal leave placed in the Leave Bank as a result of a forfeiture under § 9-307, § 9-403, or § 9-507 of this title. The Secretary may grant leave from the State Employees' Leave Bank to an employee who: has exhausted all forms of annual, personal, sick, and compensatory leave because of a serious and prolonged medical condition; provides a certificate of illness or disability; and is a member of the State Employees' Leave Bank; or is granted an exemption by the Secretary from the membership requirement for good cause.