39 Miss. Code. R. 1-6-116
Upon the written motion of any party or his attorney, the Commission may issue subpoena(s), subpoena(s) duces tecum and all necessary process in proceedings pending before it. All process issued by the Commission shall be signed by the Chairman or Executive Secretary of the Commission, and the seal of the Commission shall be affixed thereto. In issuing all subpoenas, the original and all copies shall show at whose instance the subpoena is issued. All persons responding to process issued under this rule shall be entitled to the same per diem and mileage as witnesses attending the Circuit Courts in Mississippi. Such costs are to be borne by the party at whose instance the process is issued.
Subpoena(s) duces tecum will be issued upon the written motion of a party or his attorney in the discretion of the Commission and then only when the motion sets forth as plainly as possible the books, accounts, papers or records desired to be produced and the purpose of their production. A party shall have twenty (20) days after service to respond to a subpoena duces tecum unless otherwise ordered by the Commission.
In its discretion, the Commission may require a deposit or other guarantee that the fees of witnesses and fees of officers serving process will be paid.
39 Miss. Code. R. 1-6-116