Cal. Gov. Code § 21371

The combined current and prior service pensions, disability retirement allowance or continued allowance with respect to a retired member whose effective date of retirement was prior to April 1, 1973, and who was a forestry, warden, or law enforcement member on March 31, 1973, is his or her current service pension, prior service pension, or combined prior and current service pension, disability retirement allowance or continued allowance as it was under this part as it read and applied to him or her on March 31, 1973, subject to adjustment under Article 3 (commencing with Section 21310).