California Code, Public Utilities Code - PUC § 1045

After the cancellation or revocation of a certificate, or during the period of its suspension, it is unlawful for a passenger stage corporation to conduct any operations as a carrier.  The commission may either grant or deny an application for a new certificate whenever it appears that a prior certificate of the applicant has been canceled or revoked pursuant to Section 1033.5 or whenever it appears, after hearing, that as a prior certificate holder, the applicant engaged in any of the unlawful activities set forth in Section 1033.5 for which his or her certificate might have been canceled or revoked.