Police Offences Act 1935

A police officer may direct a person in a public place to leave that place and not return for a specified period of not less than 4 hours if the police officer believes on reasonable grounds that the person – has committed or is likely to commit an offence; or is obstructing or is likely to obstruct the movement of pedestrians or vehicles; or is endangering or likely to endanger the safety of any other person; or has committed or is likely to commit a breach of the peace.

A person must comply with a direction under subsection (1). Fine not exceeding 2 penalty units.