(a) The minimum medical requirements for a hazardous materials endorsement issued pursuant to Section 12804.2 of the Vehicle Code shall be those standards specified in Section 28.18 of Article 2.1, Chapter 1, Division 1, of Title 13 of the California Code of Regulations.

(b) The department shall require a person applying for a hazardous agricultural materials endorsement to complete and submit to the department a Health Questionnaire, Form DL 546 (Rev. 11/2004) provided by the department, pursuant to Section 28.23.

(c) If an applicant for a hazardous agricultural materials endorsement fails to meet the medical standards set forth in subdivision (a), the department shall not issue the endorsement unless the applicant is renewing a license with a hazardous agricultural materials endorsement, or is submitting a new Health Questionnaire, form DL 546 (Rev. 11/2004), to retain such an endorsed license that has not yet expired, and the department determines upon evaluation of competent medical evidence that the condition or conditions do not affect the driver's ability to drive safely, and may reasonably be expected not to affect the driver's ability to drive safely within two years.