The director may establish points of inspection for vehicles transporting animals on the public roads of this state to determine if the animals being transported are accompanied by valid health certificates, permits, or other documents as required by this chapter or its rules. Vehicles transporting animals on the public roads of this state are subject to inspection and must stop at any posted inspection point established by the director, with emphasis on livestock being brought in from outside the state. The director or appointed officers are authorized to stop a vehicle transporting animals upon the public roads of this state at a place other than an inspection point if there is reasonable cause to believe the animals are being transported in violation of this chapter or its rules.