Cal. Bus. & Prof. Code § 19665

The board shall establish such rules and regulations for horse sales or horse auction sales of racehorses or breeding stock that is used in the production of racehorses which are held or conducted on the premises of any racing association under the jurisdiction of the board as are reasonably necessary to provide the horses, owners, and general public with adequate protection. Such rules and regulations shall provide for regulation of the medication or drugging of racehorses sold at horse sales or horse auction sales as provided in this section.