Miss. Code Ann. 99-15-26(5)
Upon petition therefor, the court shall expunge the record of any case in which an arrest was made, the person arrested was released and the case was dismissed or the charges were dropped or there was no disposition of such case.
Miss. Code Ann. 99-19-71
(1) Any person who has been convicted of a misdemeanor , excluding a conviction for a traffic violation, and who is a first offender, may petition for an order to expunge any such conviction from all public records. The effect of such order shall be to restore such person, in the contemplation of the law, to the status he occupied before such arrest. (2) Upon petition therefor, a court shall expunge the record of any case in which an arrest was made, the person arrested was released and the case was dismissed or the charges were dropped or there was no disposition of such case.
http://www.criminalattorney.com/states/ms_expungement.htm
SEC. 21-23-7. Powers and duties of municipal judge; mayor serving as municipal judge.
(6) Upon prior notice to the municipal prosecuting attorney and upon a showing in open court of rehabilitation, good conduct for a period of two (2) years since the last conviction in any court and that the best interest of society would be served, the court may, in its discretion, order the record of conviction of a person of any or all misdemeanors in that court expunged, and upon so doing the said person thereafter legally stands as though he had never been convicted of the said misdemeanor(s) and may lawfully so respond to any query of prior convictions. This order of expunction does not apply to the confidential records of law enforcement agencies and has no effect on the driving record of a person maintained under Title 63, Mississippi Code of 1972, or any other provision of said Title 63.
(7) Notwithstanding the provisions of subsection (6) of this section, a person who was convicted in municipal court of a misdemeanor before reaching his twenty-third birthday, excluding conviction for a traffic violation, and who is a first offender, may utilize the provisions of Section 99-19-71, to expunge such misdemeanor conviction.
it does not say how long i need to wait...