(1) A Magistrate may at any time vary or cancel a covert surveillance authority (whether issued by that Magistrate or another Magistrate).
(2) A Magistrate may vary or cancel an authority on the Magistrate's own initiative or on application made by any employee, employer or other person affected by the authority.
(3) The Magistrate may deal with an application for the variation or cancellation of an authority, subject to this Part and the regulations, in such manner as is decided by the Magistrate.