California's DNA database was brought in because of the Golden State Killer case and of course it involved a lot of good work by the Harrington family and Larry Pool. There was some resistance to it at the time. Here is an interesting report which mentions the DNA database and the arrest of Mr DeAngelo as a suspect in the case:
In 1980, an attacker broke into an Orange County home, bound UC Irvine medical student Keith Harrington, 24, and his wife Patti and raped the woman before beating the couple to death. Police thought the Golden State Killer might be responsible, but they had no suspects.
Keith’s brother Bruce Harrington became convinced that ‘the only way we can solve my family’s crime” was through DNA.
During the early 2000s, Harrington testified before the Assembly and the Senate public safety committees, “pleading that they embrace the power of DNA,” already proving effective in other states. Harrington’s pleas fell on deaf ears.
https://californiaglobe.com/legislature/california-wont-face-up-to-crime/