Ala. Code § 36-27-70

Any active and contributing member of the Employees’ Retirement System who was a regular employee of an agency eligible for participation in the Employees’ Retirement System under Section 36-27-6 and is now covered by the Employees’ Retirement System shall be eligible to receive up to eight years of creditable service for the employment, provided that the member of the Employees’ Retirement System claiming the credit shall have attained not less than five years of contributing membership service credit exclusive of military service credit under the Employees’ Retirement System, has not received credit for the same prior service under any retirement system other than the federal Social Security program, and provided further, that the member performs and complies with the conditions prescribed in Section 36-27-71.