trespass n. entering another person's property without permission of the owner or his/her agent and without lawful authority (like that given to a health inspector) and causing any damage, no matter how slight. Any interference with the owner's (or a legal tenant's) use of the property is a sufficient showing of damage and is a civil wrong (tort) sufficient to form the basis for a lawsuit against the trespasser by the owner or a tenant using the property. Trespass includes erecting a fence on another's property or a roof which overhangs a neighbor's property, swinging the boom of a crane with loads of building materials over another's property, or dumping debris on another's real estate. In addition to damages, a court may grant an injunction prohibiting any further continuing, repeated or permanent trespass.
At common law a trespass was not criminal unless it was accomplished by violence or breached the peace. Some modern statutes make any unlawful entry onto another's property a crime. When the trespass involves violence or injury to a person or property, it is always considered criminal, and penalties may be increased for more serious or malicious acts. Criminal intent may have to be proved to convict under some statutes, but in some states trespass is a criminal offense regardless of the defendant's intent.
Some statutes consider a trespass criminal only if the defendant has an unlawful purpose in entering or remaining in the place where he has no right to be. The unlawful purpose may be an attempt to disrupt a government office, theft, or Arson. Statutes in some states specify that a trespass is not criminal until after a warning, either spoken or by posted signs, has been given to the trespasser. Criminal trespass is punishable by fine or imprisonment or both.
