The owner, trainer, groom or other person who is charged with the responsibility of the horse shall protect the horse against the administration or attempted administration, either internally or externally, of a drug to the horse. If the stewards determine that an owner, trainer, groom or other person has failed to protect the horse they may immediately suspend the trainer, groom or other person and refer the matter to the Commission for final disposition.
58 Pa. Code § 163.309
This section cited in 58 Pa. Code § 163.302 (relating to foreign drugs, medications or substances); and 58 Pa. Code § 163.308 (relating to official laboratory).