Notwithstanding any approval by the state Certificate of Need Board, no methadone clinic may be located in DeKalb County without prior approval of the electors in a referendum on the matter. The ballot for the referendum shall state the physical address where the proposed clinic will be located. Notwithstanding any prior approval by the state Certificate of Need Board, any methadone clinic in existence in DeKalb County on the effective date of this amendment may not continue to operate without approval by the electors in a referendum to be held within 12 months of the effective date of this amendment. The ballot for the referendum shall state the physical address where the methadone clinic is operating.