Before the commencement of a racing season, a jockey shall be examined by a licensed physician, designated by the board of stewards in order to establish his physical condition and freedom from disabling defects or contagious disease. During the conduct of a meeting, the board of stewards may require that a jockey be reexamined and may refuse to allow the jockey to ride until he successfully passes the examination.
58 Pa. Code § 163.179