Cal. Bus. & Prof. Code § 19612.1

(a) In addition to the amounts otherwise deducted pursuant to this chapter, every association with an average daily handle of more than seven hundred fifty thousand dollars ($750,000) that conducts a harness, quarter, Arabian, or Appaloosa horse meeting may deduct from the total amount handled in daily double, quiniela, exacta, and other multiple wagering pools approved by the board up to 3 percent thereof to be distributed as additional commissions and purses in the following percentage ratio: to the association as additional commissions, not more than 59.5 percent; and to the horsemen as additional purses, not less than 40.5 percent, except that the association and the horsemen’s organization may agree to a different distribution by percentage of these funds.
(b) From the amount deducted for quarter horse purses under subdivision (a), a sum equal to 25 percent thereof shall be deposited with the official registering agency pursuant to subdivision (b) of Section 19617.7 and shall thereafter be distributed in accordance with subdivisions (c), (d), and (e) of Section 19617.7.
The board shall designate the official registering agency representing quarter horse horsemen to administer this subdivision and to distribute premiums. The agency may, with the approval of the board, make a deduction for expenses not to exceed 10 percent of the total awards fund.
(c) From the amount deducted for Arabian horse purses under subdivision (a), a sum equal to 13.33 percent thereof shall be held by the association to be deposited with the official registering agency, pursuant to Section 19617.8, and thereafter shall be distributed in accordance with Section 19617.8. The board shall designate the officially recognized organization representing Arabian horsemen to administer this subdivision and to distribute premiums. The organization may, with the approval of the board, make a deduction for expenses not to exceed 10 percent of the total awards fund.
(d) From the amount deducted for Appaloosa purses under subdivision (a), a sum equal to 13.33 percent thereof shall be deposited with the official registering agency pursuant to subdivision (b) of Section 19617.9 and shall thereafter be distributed in accordance with subdivisions (c), (d), and (e) of Section 19617.9.
The board shall designate the official registering agency representing Appaloosa horsemen to administer this subdivision and to distribute premiums. The agency may, with the approval of the board, make a deduction for expenses of up to, but not to exceed, 10 percent of the total awards fund.
(e) At least 30 days prior to the commencement of its meeting, the association shall file with the board a statement of the additional deduction to be made pursuant to subdivision (a). Except with the consent of the board, the amount of the deduction shall not be changed during the course of the meeting.
(f) In addition to the amounts otherwise deducted pursuant to this section, every harness racing association shall deduct an additional 2 percent of its exotic parimutuel pools to be distributed equally as commissions and purses.