PDFWAC 260-40-110
Horse must be in care of and saddled by a licensed trainer.
(1) No person may start a horse in a race unless the horse is under the care of a trainer licensed at the race meet.
(2) No horse may start in a race unless the licensed trainer, or an approved substitute as provided in WAC 260-28-200, saddles the horse. The stewards may approve a substitute trainer who may saddle the horse in an emergency situation.