A person who is on a premises for an unlawful purpose or without a lawful excuse is guilty of an offence and may be fined up to $2500 or up to six months gaol [Summary Offences Act 1953 s.17].
A member of the police force who believes on reasonable grounds that a person is on premises to commit an offence may order the person to leave the premises. A person who fails to obey such an order is guilty of an offence with a maximum penalty of a fine of $2500 or six months imprisonment.
For the purposes of this offence, premises means any land, building, structure, aircraft, vehicle, ship or boat. The police must prove that the defendant had no lawful excuse for being on the premises. It is unlawful to be on premises without the express or implied permission of the owner or occupier.