At all meets held at night, the post time of the last heat or race shall be not later than 11:55 p. m. prevailing time. At that hour, regardless of the completion of the program, the Presiding Judge shall cause the machines or other devices used for wagering to be locked. Associations shall provide a lock control in the Judges stand for that purpose. No racing shall be authorized or permitted on a Sunday.
58 Pa. Code § 185.23