California Code, Business and Professions Code - BPC § 7504.8

A person may work as a qualified certificate holder pending receipt of the qualification certificate if he or she has been approved by the bureau and carries on his or her person a hardcopy printout of the bureau's approval from the bureau's Internet Web site and a valid picture identification.  If a qualification certificate is lost, damaged, or destroyed, a certificate holder may continue to operate by carrying on his or her person a hardcopy printout or electronic copy of the bureau's approval of the certificate from the bureau's Internet Web site and a valid picture identification.