<P> A castle doctrine, also known as a castle law or a defense of habitation law, is a legal doctrine that designates a person's abode or any legally occupied place--e.g., a vehicle or home--as a place in which that person has protections and immunities permitting one, in certain circumstances, to use force (up to and including deadly force) to defend oneself against an intruder, free from legal prosecution for the consequences of the force used . The term is most commonly used in the United States, though many other countries invoke comparable principles in their laws . </P> <P> A person may have a duty to retreat to avoid violence if one can reasonably do so . Castle doctrines negate the duty to retreat when an individual is assaulted in a place where that individual has a right to be, such as within one's own home . Deadly force may be justified and a defense of justifiable homicide applicable, in cases "when the actor reasonably fears imminent peril of death or serious bodily harm to him or herself or another". The castle doctrine is not a defined law that can be invoked, but a set of principles which may be incorporated in some form in the law of many jurisdictions . </P>

A man's home is his castle amendment