(1) The Chief Psychiatrist or the controlling authority of an SMHU may authorise a person, or a member of a class of persons, for the purposes of as specified in the authorisation.(a) section 64 ; or(b) any or all of the provisions of this Part; or(c) any or all of the provisions of Part 4 ; or(d) any or all of the provisions of Part 3 of Chapter 4 ; or(e) any or all of the provisions of Schedule 2 (2) A reference in a provision of this Act to an authorised person is a reference to a person who is authorised under subsection (1) for the purposes of that provision or the Part containing the provision.