[Rev. 2012] National Intelligence Service NO. 28 OF 2012 17. Security screening of members of the Service (1) A person shall not be eligible for appointment as a member of the Service unless— (a) information regarding that person has been gathered in the prescribed manner, in a security screening investigation by the Service; and (b) the Service, after evaluating the gathered information, is of the reasonable opinion that such a person may be appointed as a member without the possibility of such a person being a security risk or acting in any way prejudicial to national security. (2) For the purpose of subsection (1) the Service may, in a prescribed manner, have access to— (a) criminal records; (b) financial records; (c) personal information; and (d) any other information which is relevant to that determination of the security clearance of the person. (3) The Director-General may, in the prescribed manner, issue directives on— (a) polygraph testing or any other method of testing; (b) the level of security clearance; and (c) the criteria for evaluating the security competency. (4) The Director-General may, after evaluating the information gathered under this section, issue, degrade, withdraw or refuse to grant security clearance. 18. Functions and powers of members of the Service (1) A member of the Service shall— (a) perform the functions and duties assigned to the member by or under this Act or any other written law; and (b) obey lawful orders and directions which he or she may from time receive from a person having the authority to give such directions. (2) A member of the Service shall for purposes of this Act be considered to be always on duty when required to act as such, and shall perform the duties and exercise the powers granted to him or her under this Act or any other written law at any place where he or she may be deployed. (3) A member of the Service shall have all the powers necessary for the performance of the functions of the Service under this Act, and may exercise such powers as are conferred on him or her by or under this Act or any other written law. 19. Oaths and affirmations (1) The Director-General and every member of the Service shall, before assuming office, make and subscribe to the respective oaths or affirmations as prescribed in the Third Schedule— 19 [Issue 1]