Netlaw provides you with a number of specific sites which you can access from the boxes at the top and the bottom of this page.
Here is a general overview.
The law provides many protections for individual citizens. Actual criminal behaviour is regulated by a number of statutes and enforced by the police. You bash someone and the police charge you with assault. You threaten to knock their block off and the Court sends you to prison for threatening behaviour.
But if you are being hassled in a manner short of a breach of the criminal law then you have to trigger your own remedies and this can be done four ways.
Trespass Act 1980. Under this statute, any owner or occupier of property can warn any other person, either in writing or orally, not to come on to their property again. The warning lasts two years and any breach can be punished by three months imprisonment or $1000.
Domestic Violence Act 1995. This statute is used to protect people in domestic relationships against violence which includes physical, sexual or psychological abuse. A pattern of behaviour may amount to abuse, even though some of those acts, when viewed in isolation, may appear trivial.
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