Law Enforcement (Powers and Responsibilities) Act 2002

A police officer may, without a warrant, stop, search and detain a vehicle if the police officer suspects on reasonable grounds that any of the following circumstances exists—

the vehicle contains, or a person in the vehicle has in his or her possession or under his or her control, anything stolen or otherwise unlawfully obtained,

the vehicle is being, or was, or may have been, used in or in connection with the commission of a relevant offence,

the vehicle contains anything used or intended to be used in or in connection with the commission of a relevant offence,

the vehicle is in a public place or school and contains a dangerous article that is being, or was, or may have been, used in or in connection with the commission of a relevant offence,

the vehicle contains, or a person in the vehicle has in his or her possession or under his or her control, a prohibited plant or prohibited drug in contravention of the Drug Misuse and Trafficking Act 1985,

circumstances exist on or in the vicinity of a public place or school that are likely to give rise to a serious risk to public safety and that the exercise of the powers may lessen the risk.

A police officer may, without a warrant, stop, search and detain a class of vehicles on a road, road related area or other public place or school if the police officer suspects on reasonable grounds that any of the following circumstances exist—

a vehicle of the specified class of vehicles is being, or was, or may have been, used in or in connection with the commission of an indictable offence and the exercise of the powers may provide evidence of the commission of the offence,

circumstances exist on or in the vicinity of a public place or school that are likely to give rise to a serious risk to public safety and that the exercise of the powers may lessen the risk.

A police officer may seize and detain—

all or part of a thing that the police officer suspects on reasonable grounds is stolen or otherwise unlawfully obtained, and

all or part of a thing that the police officer suspects on reasonable grounds may provide evidence of the commission of a relevant offence, and

any dangerous article, and

any prohibited plant or prohibited drug in the possession or under the control of a person in contravention of the Drug Misuse and Trafficking Act 1985,