Veh. Code, § 5105

(a) An applicant for issuance of environmental license plates or renewal of such plates in the subsequent year pursuant to this article shall file an application therefor in such form and by such date as the department may require, indicating thereon the combination of letters or numbers, or both, requested as a registration number. There shall be no duplication of registration numbers, and the department may refuse to issue any combination of letters or numbers, or both, that may carry connotations offensive to good taste and decency or which would be misleading or a duplication of license plates provided for in Article 8 (commencing with Section 5000) of Chapter 1 of Division 3.

(b) The department may cancel and order the return of any environmental license plate heretofore or hereafter issued, containing any combination of letters, or numbers, or both, which the department determines carries connotations offensive to good taste and decency or which would be misleading. Whenever the department orders any person to return any such environmental license plate containing any combination of letters or numbers, or both, which the department determines carries connotations offensive to good taste and decency or which would be misleading, the person so ordered may, in writing and within 10 days after receiving the order, demand a hearing, which shall be granted. The provisions of Chapter 5 (commencing with Section 11500), Part 1, Division 3, Title 2 of the Government Code, shall apply to hearings provided for in this subdivision. Any person ordered to return such plates shall either be reimbursed for any additional fees he paid for the plates pursuant to Section 5106 or 5108 for the registration year in which they are recalled, or be given, at no additional cost therefor, replacement environmental license plates, the issuance of which is in compliance with this code.

(c) The department may cancel and order the return of any environmental license plate, without opportunity to be heard, as specified in subdivision (b) of this section, if the license plate issued is a duplication of license plates provided for in Article 8 (commencing with Section 5000) of Chapter 1 of Division 3 or if the fee specified under subdivision (c) of Section 5106 has not been paid.