California Vehicle Code Section 4307

In the event application is made in this state for registration of a vehicle and the department is not satisfied as to the ownership of the vehicle or the existence of foreign liens thereon, then the department may register the vehicle and issue a distinctive registration card and appropriate license plates but shall withhold issuance of a California certificate of ownership unless the applicant shall present documents sufficient to reasonably satisfy the department of the applicant`s ownership of the vehicle and sufficient to identify any liens thereon or the applicant shall post a bond pursuant to Section 4157.