CA Gov't Code Section 5903.5

Section 5903 shall apply to any bonds the interest on which will not be subject to federal income taxation under the law in existence on the date of issuance or pending on the date of issuance with an effective date preceding the date of issuance, notwithstanding any other provision of law, if the bonds are issued by the same state or local government for the same project or purpose and within 45 days of the date of issuance of bonds described in Section 5903.