Law Enforcement (Powers and Responsibilities) Act 2002

A crime scene may be established on premises by a police officer if the police officer suspects on reasonable grounds that—

an offence committed in connection with a traffic accident that has resulted in the death of or serious injury to a person is being, or was, or may have been, committed on the premises and that it is reasonably necessary to establish a crime scene in or on the premises to preserve, or search for and gather, evidence of the commission of that offence, or

a serious indictable offence is being, or was, or may have been, committed on the premises and it is reasonably necessary to establish a crime scene in or on the premises to preserve, or search for and gather, evidence of the commission of that offence, or

there may be in or on the premises evidence of the commission of a serious indictable offence that may have been committed elsewhere and it is reasonably necessary to establish a crime scene in or on the premises to preserve, or search for and gather, evidence of the commission of that offence.

A crime scene may also be established on premises by a police officer pursuant to the authority conferred by a crime scene warrant.

To avoid doubt, a crime scene may be established, crime scene powers may be exercised and a crime scene warrant applied for with respect to an act or omission that is a serious indictable offence even though the act or omission occurred outside New South Wales and was not an offence against the law of New South Wales, if the act or omission if done, or omitted to be done, in New South Wales would constitute a serious indictable offence.