Miss. Code Ann. § 99-15-21

All compensation and reimbursements allowed by the judge shall be made on the basis of an itemized statement as to time and nature of work and the expense incurred by the appointed counsel. The attorney general shall prepare and make available the proper form for the itemized statement which is to be submitted to the appropriate judge by the attorney or attorneys. Compensation and reimbursements authorized by Sections 99-15-15 through 99-15-21 shall be allowed only in cases in which the appointment is made subsequent to April 5, 1971. In all cases in which counsel have been appointed prior to said date, compensation shall be allowed in the same manner and to the same extent as provided by law at the time such appointment was made.