The area designated for the control of brucellosis may consist of the entire state, a portion of the state, entire county or part of the county, but if less than the entire county the boundary of the area shall be clearly defined in the order for the establishment of such area. When the department has established an area for the control of such disease, within a county, the commissioners of such county shall be notified and assist in the dissemination of the order and in policing the movement of livestock and other animals into and out of such area.
Idaho Code § 25-604