Cal. Food & Agric. Code § 64691.5

A fee greater than one dollar ($1) per head on cattle and calves prescribed by Section 64691 shall not be charged pursuant to that section under a mandatory fee payment program, unless and until the greater fee is approved by the producers in this state, by a referendum to be submitted to the producers by the secretary. The secretary shall find that the producers have approved any greater fee, if he or she finds that 60 percent of the producers voting in the referendum voted in favor of charging the greater fee. Ballots shall be provided to producers from a list provided by the council and approved by the secretary, and to other producers who request a ballot that provide proof of eligibility.