Miss. Code Ann. § 71-3-57: Miss. Code Ann. § 71-3-57

The commission shall regulate, by rules published and available to the parties, the summoning, attendance, use, and compensation of witnesses, and determine the qualifications of specialists and their scale of fees as expert witnesses. Unless otherwise provided by the commission, witnesses summoned in a proceeding before the commission or whose depositions are taken shall receive the same fees and mileage as witnesses in civil cases in courts of record.