Legal Question in Criminal Law in California

It depends. Does your roommate have a search clause requiring him to allow the police to search his home?

If he does, you have to let them into the house when he isn't home. If you don't, you could be charged with obstructing an officer.

By living with someone who's on searchable probation, you lower your expectation of privacy in your home.

No, but it they think they have the right to break down the door, they will.