Cal. Food & Agric. Code § 13167

The director shall revoke or refuse to renew a certificate of interim registration at any time that he or she finds that the interim registration no longer meets all the requirements of this article, including the registrant’s failure to submit a progress report for any deferred study, a failure to show in the report that a good faith effort to complete an acceptable study is making satisfactory progress, or the period of time from the issuance of the certificate has exceeded the three year limit set forth in Section 13162. The director shall provide the registrant with the basis for the decision in writing.