Subsection (2) applies if the responsible chief officer of police determines that it is necessary for—
to be retained for the purposes of national security.
Where this subsection applies—
for as long as the determination has effect.
A determination under subsection (1) has effect for a maximum of 2 years beginning with the date on which the material would otherwise be required to be destroyed, but a determination may be renewed.
"Responsible chief officer of police" means the chief officer of police for the police area—