Miss. Code § 23-15-69
All cases on appeal shall be heard by the boards of election commissioners de novo, and oral and documentary evidence may be heard by them; and they are authorized to administer oaths to witnesses before them; and they have power to subpoena witnesses, and to compel their attendance; to send for persons and papers; to require the sheriff and constables to attend them and to execute their process. The decisions of the commissioners in all cases shall be final as to questions of fact, but as to matters of law they may be revised by circuit courts and the Supreme Court. The registrar shall obey the orders of the commissioners in directing a person to be registered, or a name to be stricken from the Statewide Elections Management System.
Miss. Code § 23-15-69