Cal. Welfare and Institutions Code § 5965.15

(a) Notwithstanding any provision of this chapter or the State General Obligation Bond Law, if the Treasurer sells bonds pursuant to this chapter that include a bond counsel opinion to the effect that the interest on the bonds is excluded from gross income for federal tax purposes, under designated conditions, or is otherwise entitled to a federal tax advantage, the Treasurer may maintain separate accounts for the investment of bond proceeds and the investment earnings on those proceeds. (b) The Treasurer may use or direct the use of those proceeds or earnings to pay a rebate, penalty, or other payment required under federal law or to take any other action with respect to the investment and use of those bond proceeds, required or desirable under federal law, to maintain the tax-exempt status of those bonds and to obtain any other advantage under federal law on behalf of the funds of this state.