s 63M Retention of section 63D material for purposes of national security
(1) Section 63D material may be retained for as long as a national security determination made by a chief officer of police has effect in relation to it. (2) A national security determination is made if a chief officer of police determines that it is necessary for any section 63D material to be retained for the purposes of national security. (3) A national security determination— (a) must be made in writing, (b) has effect for a maximum of 5 years beginning with the date on which it is made, and (c) may be renewed.