California Code, Vehicle Code - VEH § 11207

(a) The department shall issue a license certificate to each traffic violator school instructor when it is satisfied that he or she has met the qualifications required under this chapter. The original instructor license and any license renewed pursuant to subdivisions (b) and (c) shall be valid for a period of three years from the date of issuance unless canceled, suspended, or revoked by the department.

(b) Every application for the renewal of a traffic violator school instructor license may be made by the licensee prior to the expiration date of the license by presenting to the department a completed application on a form provided by the department.In no event shall a traffic violator school instructor renew the license after the date of expiration.

(c) The department shall require all of the following for the renewal of an instructor's license:

(d) When, in its judgment, the public interest so requires, the department may issue a probationary license subject to special conditions to be observed by the licensee in the exercise of the privilege granted. The conditions to be attached to the license shall be such as may, in the judgment of the department, be in the public interest and suitable to the qualifications of the applicant, as disclosed by the application and investigation by the department of the information contained therein.