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An "eviction" is a special legal procedure handled through the court system and is usually an "order" made by a judge or magistrate. An eviction is used to get a tenant to move out. A person is considered a tenant only if they are supposed to pay rent. A house guest is just that - a guest. Guests are not expected to pay rent. If the home owner tells a guest to move out and the guest refuses then the "guest" becomes a "trespasser". Trespass is almost always considered a crime and police are supposed to arrest criminal trespassers. No eviction is needed.