Md. Code, State Personnel and Pensions § 13–204

Except as authorized under § 13-303 of this title, the Secretary may not continue certification for any contractual employee if the Secretary determines that the services performed under the contract:

(1) encompass permanent functions;

(2) have no specific expiration date; and

(3) regularly are performed on a basis that is at least equal to 50% of the work responsibility of a full-time permanent employee.