(1) A State competent authority may appoint employees of the authority or other persons who, in the opinion of the authority, are suitably qualified or experienced, to be authorised officers for the purpose of this Chapter.
(3) An appointment or revocation under this section shall be in writing.
(a) on the revocation by the authority of the appointment,
(b) in a case where the appointment is for a specified period, on the expiration of the period,
(c) on the person's resignation from the appointment, or
(d) in a case where the person is an employee of the authority -
(i) on the resignation of the person as an employee of the authority, or
(ii) on the termination of the person's employment with the authority for any other reason.