(a) Notwithstanding any other provisions of this chapter, contributions shall not be deducted from the salary of any member having credit for 30 years’ service providing the member was a member on March 7, 1973, and remained in membership continuously until credited with 30 years’ service.
(b) Notwithstanding subdivision (a), contributions shall not be deducted from the salary of any member having credit for 30 years’ of continuous service in the retirement association of a county of the seventh class as established by Sections 28020 and 28028.