No person shall directly or indirectly interfere with the leading of horses from the stable area or to the receiving barn or to the paddock or in the parade by throwing any article at such horses, by waving hats or arms, or in any other manner frighten such horses; nor shall any person interfere with, block or impede any racing participant who is then performing his proper duties, nor fight, threaten to fight, or strike at any racing participant who is then performing his duties nor interfere with, block, impede or disrupt any racing operation in any manner.
Cal. Code Regs. Tit. 4, § 1897