Section 3Z — Crimes Act 1914: Power of arrest without warrant by other persons

(1) A person who is not a constable may, without warrant, arrest another person if he or she believes on reasonable grounds that: (a) the other person is committing or has just committed an indictable offence; and (b) proceedings by summons against the other person would not achieve one or more of the purposes referred to in paragraph 3W(1)(b). (2) A person who arrests another person under subsection (1) must, as soon as practicable after the arrest, arrange for the other person, and any property found on the other person, to be delivered into the custody of a constable.