44.100 R.S.Mo. 3(i)
Powers, Duties, Rights, Privileges, and Immunities: Emergency Response Worker and Law Enforcement Providing Aid in Another Jurisdiction
When an emergency declaration is in effect, emergency response workers and law enforcement authorities, who are in the state at the request of the governor, a mutual aid agreement, or a compact, will have the same powers, duties, rights, privileges, and immunities as if they were in their home jurisdiction.
Emergency powers of the governor
(3) During the period that the state of emergency exists or continues, the governor shall: (i) In accordance with rules or regulations, provide that all law enforcement authorities and other emergency response workers and agencies of other states who may be within this state at the request of the governor or pursuant to state or local mutual-aid agreements or compacts shall have the same authority and possess the same powers, duties, rights, privileges and immunities as are possessed by like law enforcement authorities and emergency response workers and agencies of this state;