(a) The Chief State’s Attorney, each deputy chief state’s attorney and each state’s attorney, assistant state’s attorney and deputy assistant state’s attorney shall, at the time of his or her appointment be an attorney-at-law and the Chief State’s Attorney, each deputy chief state’s attorney and each state’s attorney shall have been admitted to the practice of law for at least three years.

(b) The Chief State’s Attorney, each deputy chief state’s attorney, and each state’s attorney shall devote his or her full time to the duties of his or her office, shall not otherwise engage in the practice of law, shall not be a partner, member or associate of a law firm, and shall not be an elected officer of this state or any political subdivision thereof.

(c) Each assistant state’s attorney and deputy assistant state’s attorney appointed to serve on a full-time basis shall devote his or her full time to the duties of his or her office, shall not engage in the private practice of law, shall not be a partner, member or associate of a law firm, and shall not be an elected officer of this state. No part-time assistant state’s attorney, no part-time deputy assistant state’s attorney and no partner or associate of a law firm of which such attorney is a partner or associate may engage in the private practice of criminal law.