58 Pa. Code § 165.79
The licensee shall supervise the practice and methods of so-called merchandise vendors who may have entry to the track enclosure to solicit among the employes and other licensees engaged at the track, provided, however, that the licensee shall not, by virtue of this section or otherwise, restrict purchasing or attempt to control or monopolize the proper selling of merchandise to owners, trainers, or stable employes. Each so-called merchandise vendor shall be licensed by the Commission. Each licensed vendor shall submit a list of his wares to the Stewards. A licensed vendor dealing with medicines for horses shall also submit a list of medicines or preparations he intends to sell to the Commission Veterinarian for his approval. No sale may be made of any medicine, preparation, or other wares prior to such approval. No merchandise vendor shall be permitted access to the stable area within three hours of any post time.
58 Pa. Code § 165.79