The Department shall certify as a qualified child protective investigator or child welfare specialist, each applicant for the respective certification who proves to the satisfaction of the Department his fitness to be certified under the terms of this Act. It shall continue to issue to each person a certified status document, which shall be prima facie evidence of the right of the person to whom it is issued to present himself as a certified child protective investigator or a certified child welfare specialist, as the case may be, subject to the conditions and limitations of this Act.