(1) For the purposes of the discharge of its functions the Commission has power—
(a) to request any information, documents or things, with respect to a complaint, from—
(i) the Commissioner,
(ii) the Unit,
(iii) any person making a complaint,
(iv) the police officer against whom the complaint is made, or
(v) any other person who, in the opinion of the Commission, may be able to assist;
(b) in the case of a review of a complaint to—
(i) request all or any of the parties concerned as well as witnesses to appear before the Commission,
(ii) request such information, documents or things as it deems necessary to review the complaint.
(2) The Commission may give such guidance to the Unit as may be necessary to ensure thoroughness and impartiality in the carrying out of the functions of the Unit.