A hearing as provided in Code Section 50-6-29 shall be held in the county where the department or institution being investigated is located and shall be presided over by the state auditor. The state auditor shall, at any time when he deems necessary, request of the Governor legal assistance in conducting the investigation. Upon such request the Governor shall designate the Attorney General, his assistants, or any special assistant attorney general for the purpose of assisting the state auditor in the prosecution of the investigation.