Police Powers and Responsibilities Act 2000

It is lawful for a police officer—

to enter a place to reach another place that the police officer reasonably suspects is a crime scene; and

to enter a place that the police officer reasonably suspects is a crime scene and stay on the place for the time reasonably necessary to decide whether or not to establish a crime scene.

What is a reasonable time for subsection (1)(b) will depend on the particular circumstances including—

the nature of any information obtained or any observation made that suggests the place is a crime scene; and

visible evidence that will help decide whether it is a crime scene; and

any preliminary inspection of the place.