(a) Each district may make a levy on all taxable property located within the district for the purposes specified in this section. The maximum amount which may be levied for all costs under this section shall be equal to $ 36 multiplied by the district’s adjusted pupil units for the school year. The proceeds of the levy must be reserved and used for directly funding the following purposes or for reimbursing the cities and counties who contract with the district for the following purposes:

(3) to pay the costs for a gang resistance education training curriculum in the district’s schools