My understanding was that this is not a law, but a policy. This comment actually had me read up a bit on this, here's an interesting article[1] (I have no idea

My understanding was that this is not a law, but a policy. This comment actually had me read up a bit on this, here's an interesting article[1] (I have no idea how credible the source is, but at a glance it seems to be relatively unbiased). The take away I have is that there is some debate over this, but we don't seem to have quarantine laws in place to handle large scale quarantine. [1] https://californiaglobe.com/section-2/does-gov-newsom-have-the-power-to-shut-down-private-businesses-because-of-coronavirus/ https://californiaglobe.com/section-2/does-gov-newsom-have-t...