20Power to enter premises for surveillance or to protect persons

20 Power to enter premises for surveillance or to protect persons (1) A police officer may, without a warrant, enter, search and remain on premises that are in an area that is the target of an authorisation if he or she suspects on reasonable grounds that it is necessary to do so for one of the following purposes or both: (a) to enable the surveillance or observation of a person who the officer suspects on reasonable grounds may have committed a terrorist act or may be intending in the near future to commit a terrorist act; (b) to ensure the health or safety of a person by ensuring that a person on the premises leaves or remains at the premises. Terrorism (Emergency Powers) Act 2003 13 (2) A police officer may direct a person who is on premises that are entered under subsection (1) to remain on the premises, or to leave the premises, for as long as is reasonably necessary to do so for a purpose specified in subsection (1).