Mississippi Code Title 19. Counties and County Officers § 19-23-11

(1) The county prosecuting attorney shall appear and represent the state in all investigations for felony before the various justice court judges in his county. He shall also appear before justice court judges and prosecute all cases against persons charged with offenses therein. The county prosecuting attorney shall be the prosecuting attorney for the county court and shall prosecute all state criminal cases therein, and he shall represent the state in criminal cases appealed from the county court to the circuit court.

(2) The county prosecuting attorney may assist the district attorney in all criminal cases and in all civil cases where the services of the district attorney are required in which the state, his county or any municipality of his county is interested.

(3) The county prosecuting attorney may present any matter to the grand jury of his county.

(4) The county prosecuting attorney shall have full responsibility for all misdemeanors, youth court proceedings, and all other cases not specifically granted to the district attorney. Provided, however, that in any municipality having a municipal youth court, the municipal prosecutor shall have responsibility for youth court matters in that court.

Where any statute of this state confers a jurisdiction, responsibility, duty, privilege or power upon a county attorney or county prosecuting attorney, either solely, jointly or alternatively with a district attorney, such county prosecuting attorney shall be responsible for the prosecution, handling, appearance, disposition or other duty conferred by such statute. Any such provision shall not be construed to bestow such responsibility, jurisdiction or power upon the district attorney where there is no elected county prosecuting attorney, and any such matter shall be handled pursuant to subsection (8) of this section.

(5) In any case handled by the county prosecuting attorney pursuant to this section which subsequently results in charges being modified in such a manner that the case would be within the jurisdiction of the district attorney pursuant to Section 25-31-11, the responsibility for prosecution shall be transferred to the district attorney. The county prosecuting attorney shall report to the district attorney the disposition of all affidavits, crimes, occurrences or arrests handled by him wherein any person is charged with a crime for which a conviction may result in imprisonment in the State Penitentiary.

(6) The validity of any judgment or sentence shall not be affected by the division of jurisdiction under this section, and no judgment or sentence may be reversed or modified upon the basis that the case was not processed according to subsection (5) of this section.

(7) A county prosecuting attorney may be designated by the district attorney to appear on behalf of the district attorney pursuant to an agreement relating to appearances in certain courts or proceedings in the county of the county prosecuting attorney. Such agreement shall be filed with the circuit court clerk of any county where such agreement shall be operative. Such agreement shall be binding upon the district attorney and county prosecuting attorney or municipal prosecuting attorney until dissolved by either of them in writing upon five (5) days' notice.

(8) In the event that there is no elected county prosecuting attorney serving in a county, the prosecution of such cases shall be handled by a county attorney employed by the board of supervisors of such county pursuant to Section 19-3-49.