The Department shall, by rule or regulation, establish reasonable qualifications for approved humane investigators and shall maintain a current listing of all approved humane investigators which shall be available for public inspection. These qualifications shall include, but need not be limited to, a knowledge of the provisions of this Act and its rules and regulations and expertise in the investigation of complaints relating to the care and treatment of animals. Persons designated as humane investigators shall cooperate, when requested, in completing routine investigations and filing reports of violations of this Act received by the Department.
     Employees of the Department may be assigned as Department investigators.