19-7-312. Transfer of membership -- purchase of previous service. A person who elects to become a member of the sheriffs' retirement system pursuant to 19-7-301 may transfer the member's previous service credit in the public employees' retirement system or in another system provided for in chapter 5, 6, 8, 9, or 13 of this title into the sheriffs' retirement system by paying the actuarial cost required under the provisions of 19-2-715.