California Code, Business and Professions Code - BPC § 18855

The commission shall recognize and enforce contracts between boxers or martial arts fighters and managers and between boxers or martial arts fighters and licensed clubs. Contracts shall be executed on printed forms approved by the commission. The commission may recognize or enforce a contract not on its printed form if entered into in another jurisdiction. No other contract or agreement may be recognized or enforced by the commission. All disputes between the parties to the contract, including the validity of the contract, shall be arbitrated by the commission pursuant to the provisions of the contract. Subject to Section 227 of Title 4 of the California Code of Regulations, a person who seeks arbitration of a contract shall send a written request to the commission's headquarters and to the office of the Attorney General. The commission may seek cost recovery related to arbitration proceedings from the parties subject to the proceedings.