ARSD 20:04:21:50. Substitute trainer required

When a trainer is to be absent from his stable or the grounds where his horses are racing for a period of more than two racing days and his horses are entered or are to be entered, he must provide a licensed trainer to assume the complete responsibility of the horses he is entering or running. The licensed substitute trainer shall sign in the presence of the stewards a form furnished by the commission accepting complete responsibility of the horse or horses being entered or running.