Iowa StatutesCHAPTER 172B - LIVESTOCK TRANSPORTATION172B.1 - DEFINITIONS.172B.2 - TRANSPORTATION CERTIFICATE EXHIBITED -- PUBLIC OFFENSE.172B.3 - FORM OF CERTIFICATE -- SUBSTITUTES.172B.4 - EXECUTION AND RETENTION OF RECORDS.172B.5 - AUTHORITY OF LAW ENFORCEMENT OFFICERS.172B.6 - OFFENSES AND PENALTIES.