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taxes. (a) In any county, a tax shall be imposed upon all persons engaged in the business of selling tangible personal property, other than personal property titled or registered with an agency of this State's government, at retail in the county on the gross receipts from the sales made in the course of business to provide revenue to be used exclusively for (i) school facility purposes (except as otherwise provided in this Section), (ii) school resource officers and mental health professionals, or (iii) school facility purposes, school resource officers, and mental health professionals if a proposition for the tax has been submitted to the electors of that county and approved by a majority of those voting on the question as provided in subsection (c). The tax under this Section shall be imposed only in one-quarter percent increments and may not exceed 1%. This additional tax may not be imposed on tangible personal property taxed at the 1% rate under the Retailers' Occupation Tax Act (or at the 0% rate imposed under Public Act 102-700). Beginning December 1, 2019 and through December 31, 2020, this tax is not imposed on sales of aviation fuel unless the tax revenue is expended for airport-related purposes. If the county does not have an airport-related purpose to which it dedicates aviation fuel tax revenue, then aviation fuel is excluded from the tax. The county must comply with the certification requirements for airport-related purposes under SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468