(1) On executing a search warrant, the inspector executing the warrant—
(a) must announce that the inspector is authorised by the warrant to enter the place; and
(b) if the inspector has been unable to obtain unforced entry, must give any person at the premises an opportunity to allow entry to the place.
(2) An inspector need not comply with subsection (1) if the inspector believes, on reasonable grounds, that immediate entry to the place or vehicle is required to ensure—
(a) the safety of any person; or
(b) that the effective execution of the search warrant is not frustrated.