My question involves an eviction in the state of: California

I am currently renting a room in the townhouse that I own. This person I feel comes under the category of a "lodger" as defined by the California Department of Consumer Affairs and their website. I have two short questions.

1. Is the Department of Consumer Affairs, the legal binding authority when it comes to beginning the eviction process against this "lodger or should I refer to California's Civil Code?

2. Also, I have discovered that the "lodger" has removed the door knob and lock and replaced it with their own.
Legal or illegal?

Thanks and appreciate your help in this manner.


SgtJackWagon