Mississippi Code Title 19. Counties and County Officers § 19-23-13

The county prosecuting attorney shall not represent or defend any person in any criminal prosecution in the name of the state, county or municipality of the county, nor shall he or she give any advice against the state, his or her county or in a criminal case against a municipality of his or her county, and shall not represent any person in any case against the state, his or her county, or in a criminal case arising in a municipal court of his or her county. Nothing herein shall prohibit any county prosecuting attorney from defending any person in any criminal prosecution in any county not within the county in which he or she is the county prosecuting attorney.