California Code, Penal Code - PEN § 1487

1. When the jurisdiction of such Court or officer has been exceeded;

2. When the imprisonment was at first lawful, yet by some act, omission, or event which has taken place afterwards, the party has become entitled to a discharge;

3. When the process is defective in some matter of substance required by law, rendering such process void;

4. When the process, though proper in form, has been issued in a case not allowed by law;

5. When the person having the custody of the prisoner is not the person allowed by law to detain him;

6. Where the process is not authorized by any order, judgment, or decree of any Court, nor by any provision of law;

7. Where a party has been committed on a criminal charge without reasonable or probable cause.