加州去年通过了防止侵占房屋的法律

如果你的房屋空置，你可以去警察局登记，602 letter，有效期一年。这样警察就有依据马上驱逐入侵者

为什么这里有些人只抱怨，不知道蓝州也是保护财产的？

https://caanet.org/newsom-signs-bill-offering-enhanced-trespass-protections-for-property-owners/

The newly passed SB 602 modifies this procedure so that property owners will now be able to keep their 602 letters active for up to a year. Additionally, if a property is permanently closed and posted as such, the authorization letter will remain in effect for three years. The legislation also allows property owners to electronically submit their requests.