Cal. Gov. Code § 16403

Any state agency that withdraws a revolving fund shall remain fully accountable therefor. All disbursements must be substantiated by vouchers filed with and audited by the Controller. Disbursements may be reported, substantiated by vouchers, from time to time to the Controller in connection with claims for reimbursement of the revolving fund. At any time upon the demand of the Department of Finance or the Controller, every revolving fund must be accounted for and substantiated by vouchers and itemized statements submitted to and audited by the Controller.