The stewards may require any person or any racing interest, its members or authorized agent, making a claim for a horse in any claiming race to make an affidavit in writing that he is claiming said horse for his own account if an individual owner, for the account of the racing interest if comprised of more than one licensed owner, or for the claiming racing interest if an authorized agent, and that the claim is not being made for any other person.
Cal. Code Regs. Tit. 4, § 1654