Miss. Code § 21-21-35
Any municipality shall have the power by resolution or order of its governing body to make provision for or to authorize its mayor or chief administrative officer or chief of police to make provision for its regularly employed law enforcement officers to assist any other municipality, when in the opinion of the mayor or other officer authorized to declare a state of civil emergency in such other municipality, there exists in such other municipality a need for the services of additional law enforcement officers to protect the health, life and property of such other municipality, its inhabitants, and the visitors thereto, by reason of riot, unlawful assembly characterized by the use of force and violence, or threat thereof by three (3) or more persons acting together or without lawful authority, or during time of natural disaster or man-made calamity.
Any municipality shall have the power to send law enforcement officers of its municipality on loan to assist other municipalities in the state in undercover work or as a special agent to combat crime. The chief administrative officer or chief of police of a municipality shall have the power to assist other chief administrative officers or chiefs of police upon a written or oral request from such municipalities; provided, however, that an oral request must be followed by a written authorization. In addition, any municipality may loan any law enforcement officer to any other law enforcement agency of the state or of any political subdivision of the state for drug enforcement purposes, the expense of the officer to be paid by the agency to which the officer is assigned.
Miss. Code § 21-21-35