No person elected or appointed sheriff or any elected or appointed DeKalb County official may assume a supernumerary office after the effective date of this amendment. Any person who, on the effective date of this amendment, is entitled to participate in a supernumerary program may continue to participate in that supernumerary program, which shall include the assumption of a supernumerary office according to the terms and conditions of the law which established that supernumerary program. Every elected or appointed DeKalb County official including the sheriff may participate in the Employees' Retirement System of Alabama upon the same terms and conditions as may be specified by law for any other employee in the same retirement system. DeKalb County officials holding office at the time of ratification of this amendment shall be eligible to purchase service credit in the Employees' Retirement System for the time the official has served in the current office; provided, however, the official shall forego the assumption of a supernumerary office. For the purposes of this amendment, the words "elected or appointed DeKalb County official" include, subject only to express limitation, any person elected to represent DeKalb County in any representative body of the state and includes any person appointed to serve the remaining term of an elected or appointed DeKalb County official, but shall not include a judge, district attorney, legislator, constable, school board member, or any official elected from a judicial circuit.