(a) A person in possession or control of premises or a person who is licensed or privileged to be thereon, may, subject to the provisions of paragraph (b) of this section, use physical force upon another person when and to the extent that he reasonably believes it necessary to prevent or terminate what he reasonably believes to be the commission or attempted commission of the crime of trespass by the other person.

    (b) A person may not use deadly force under circumstances described in paragraph (a) of this section unless the use of deadly force is authorized under state or federal law.

    (c) The defendant shall have the burden of injecting the issue of justification under this section.

(Code 1964, § 7.655)

     State law reference(s)--Similar provisions, RSMo. § 563.036.