You've screwed your friend over with some really bad/bs advice. Because in California, there's a difference between a tenant, and a lodger, which your friend is.

http://www.dca.ca.gov/publications/landlordbook/whois.shtml

Some important bits:

The owner can enter all areas occupied by the lodger and has overall control of the house .

And, more importantly,

However, in the case of a single lodger in a house where there are no other lodgers, the owner can evict the lodger without using formal eviction proceedings. The owner can give the lodger written notice that the lodger cannot continue to use the room. The amount of notice must be the same as the number of days between rent payments (for example, 30 days)... When the owner has given the lodger proper notice and the time has expired, the lodger has no further right to remain in the owner's house and may be removed as a trespasser.

Your friend may have 30 days, but even that's arguable because of their other, unlawful, actions.