State Statute
The state statute is lengthy, but the sections listed below pertain directly to the issue of trespassers at your business or property:
609.605 TRESPASS.
(b) A person is guilty of a misdemeanor if the person intentionally:
(3) trespasses on the premises of another and, without claim of right, refuses to depart from the premises on demand of the lawful possessor;
(8) returns to the property of another within one year after being told to leave the property and not to return, if the actor is without claim of right to the property or consent of one with authority to consent;
Read the full statute.