California Code, Business and Professions Code - BPC § 19614.3

(a) Notwithstanding any other provision of law, a racing association and the organization representing horsemen may agree to reduce the portion deducted from the parimutuel pool for purses and commissions, provided that the change only affect funds available for purses and commissions.

(b) Any collective bargaining agreement that is premised in part on the amount of commissions earned shall continue to be calculated based on the amount of commissions that would have been earned had this section not become law.

(c) An agreement by a horsemen's organization and a racing association to reduce the portion deducted from the parimutuel pool for purses and commissions is subject to the approval of the California Horse Racing Board, and may not be approved unless notice has been given to any labor organization that could be affected by the agreement.