Competition and Consumer Act 2010 (Cth)
Announcement before entry
(1) Before any person enters premises under a search warrant, the executing officer must:
(a) announce that he or she is authorised to enter the premises; and
(b) give any person at the premises an opportunity to allow entry to the premises.
(2) However, the executing officer is not required to comply with subsection (1) if he or she believes on reasonable grounds that immediate entry to the premises is required to ensure that the effective execution of the warrant is not frustrated.