The department of medicaid may appoint and commission any competent person to serve as a special agent, investigator, or representative to perform a designated duty for and on behalf of the department. Specific credentials shall be given by the department to each person so designated, and each credential shall state the following:
(A) The person's name;
(B) The agency with which the person is connected;
(C) The purpose of the appointment;
(D) The date the appointment expires, if appropriate;
(E) Such information as the department considers proper.