(a) Notwithstanding any other provision of law:
(1) A county shall not grant credit for service to an elective officer or member of the board of supervisors for service that the elective officer or member has not performed.
(2) A county shall not pay contributions for credit for service if an elective officer or member has not performed the service, regardless of the fact that the elective officer or member of the board of supervisors may personally elect to contribute for additional credit for service.
(b) The prohibition provided by this section does not preclude an elective officer or member of the board of supervisors from choosing to receive credit for service in a retirement system by paying his or her own contributions for that purpose pursuant to the applicable provisions of the retirement system.