How is not that a thing already ? Especially in California, isn't it supposed to be a "progressive state" ? As a french person, the US seems totally bonkers about everything related to pregnancies and sex in general.
It is and has been for a long time, but not everywhere in the state, hence the mandate.
Here's a news story about opposition to the existing program in the state's largest district having evaporated... in 1993.
https://www.latimes.com/archives/la-xpm-1993-07-06-me-10392-...
When I was in school in another state, many moons ago, they had free condoms available.