Ariz. Rev. Stat. § 15-1875
A. The plan shall be operated through the use of accounts in the fund established by account owners. Payments to the fund for participation in the plan shall be made by account owners pursuant to tuition savings agreements. An account may be opened by any person who desires to invest in the fund and to save to pay qualified higher education expenses by satisfying each of the following requirements:
1. Completing an application in the form prescribed by the treasurer. The application shall include the following information:
F. Changes in designated beneficiaries and rollovers under this section are not allowed if the changes or rollovers would violate either of the following:
L. On the recommendation of the treasurer, the board shall adopt rules to prevent contributions on behalf of a designated beneficiary in excess of those necessary to pay the qualified higher education expenses of the designated beneficiaries. The rules shall address the following:
3. The board shall review the quarterly reports received from participating financial institutions and certify that the balance in all qualified tuition programs, as defined in section 529 of the internal revenue code, of which that person is the designated beneficiary does not exceed the lesser of: