30 Miss. Code. R. 2645-1.7
The complaint counsel of the Board may amend a summons and affidavit after being duly served upon respondent at any time prior to the scheduled hearing date, provided, the amendment is for the purpose of correcting a clerical error or clarifying facts set forth in the affidavit. A summons and affidavit may be amended to add additional charges or counts provided the amended summons and affidavit is served upon respondent not less than thirty (30) days from the scheduled hearing date or by mutual agreement of the parties.
A respondent may amend his or her answer as a matter of course at any time before the answer is due. Otherwise, a respondent may amend his or her answer only by leave of the Board. Leave shall be freely given when justice so requires.
30 Miss. Code. R. 2645-1.7