California Code, Business and Professions Code - BPC § 5087

(a) The board may issue a certified public accountant license to any applicant who is a holder of a current, active, and unrestricted certified public accountant license issued under the laws of any state with comparable licensure requirements and who has not committed acts or crimes constituting grounds for denial under Section 480.  To be authorized to sign reports on attest engagements, the applicant shall meet the requirements of Section 5095.

(b) The board may in particular cases waive any of the requirements regarding the circumstances in which the various parts of the examination were to be passed for an applicant from another state.