Legal Question in Criminal Law in California

If you received a subpoena and don't show, the court will issue a warrant for your arrest, and police will come to your home and arrest you.

There is no legal obligation to provide information to the police or prosecutor. The only issues are if you actively lie or cover for somebody you know committed a felony or if you are properly subpoenaed and fail to show to court.

A proper subpoena is one they hand to you or that you acknowledge getting. If you are properly served, but don't show up, the party that subpoenaed you can ask for a warrant for your noncompliance.