(1) For the purposes of the inquiry the Commission may of its own motion, or on application, issue in writing a summons requiring any person to attend at the time and place specified in the summons and to give evidence, and to produce any papers, documents, records, or things in that person's possession or under that person's control that are relevant to the subject of the inquiry.
(2) For the purposes of this Act, the power to issue summonses or to do any other act preliminary or incidental to the hearing of any matter by the Commission, may be exercised by the Commission or its Chairman, or by an officer of the Commission purporting to act by direction or with the authority of the Commission or its Chairman.
Sections 4B to 4D were inserted, as from 4 July 1980, by section 4 Commissions of Inquiry Amendment Act 1980 (1980 No 2).