Miss. Code § 19-25-23
Each sheriff shall maintain and cause to be paid a sufficient number of regular deputies, properly trained and adequately equipped, to insure the domestic tranquility within his county. In addition thereto, each sheriff may maintain an adequate number of properly trained auxiliary deputy sheriffs to be equipped, trained and paid from the general county fund. The number of said auxiliary deputies shall be approved by the board of supervisors and may be increased or reduced from time to time by said board. All regular and auxiliary deputies may serve in any other county of the state when requested by the sheriff of such county to preserve law and order therein, the expense thereof to be paid by the county in which they serve. The request shall be made to the sheriff of the county in which said deputies are located and said deputies shall remain under the control of said sheriff except to the extent delegated by said sheriff to the sheriff of the requesting county. In addition, any sheriff may loan any regular or auxiliary deputy to any 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 § 19-25-23