No trainer shall have in his custody within the inclosure of any race meeting any horse owned in whole or in part by any person who is not licensed as a Horse Owner by the Board unless such owner has filed an Application for License as a Horse Owner with the Board and the same is pending before the Board; nor shall any trainer have in his employ within the inclosure any groom, stable employee, stable foreman, agent, or other person required to be licensed, unless such person has a valid license. All changes of employee personnel shall be reported immediately to the Board.
Cal. Code Regs. Tit. 4, § 1895