59. (1) Subject to the provisions of this Part and the Schedule, any rules made under section 57 and any guidelines made under section 58, an authorised officer may follow such procedures for the conduct of an investigation, or the exercise of powers under section 51, as he or she considers appropriate.

(2) An authorised officer shall, in the conduct of an investigation, take reasonable steps to keep the inquiry subject informed as to the progress of the investigation.