Chapter 24:28:03 - Duration and expiration of certificatesBrowse as ListSearch WithinSection 24:28:03:01 - Issuance and duration of certificateSection 24:28:03:02 - Expired certificateSection 24:28:03:03 - Invalid educator certificateSection 24:28:03:04 - Invalid certificate and renewal after expirationSection 24:28:03:05 - Hardship modification