California Code of Regulations
Title 13 - Motor Vehicles
Division 1 - Department of Motor Vehicles
Chapter 1 - Department of Motor Vehicles
Article 2.1 - Commercial Driver Licenses
Section 26.02 - Citizenship and Residency Proof for Issuance, Renewal, Transfer or Upgrade of Commercial Learner's Permit or License

(a) If the department verifies the U.S. citizenship or lawful permanent residency of a license or permit holder and records the date of that verification in the department record associated with the license or permit holder, the department may rely on this record as proof of citizenship or lawful permanent residency.

(b) If the department does not have a record of prior verification of U.S. citizenship or lawful permanent residency for any license or permit holder, the proof must be submitted pursuant to section 26.01.

(c) A commercial driver's license or commercial learner's permit issued to a person submitting documents pursuant to 26.01(b) will be termed to expire on the same date as the expiration date on the valid DHS document. The person may not renew or upgrade without submitting a document pursuant to 26.01(a) or (b).

(d) Proof of residency is required for each issuance, renewal, transfer or upgrade of any commercial learner's permit or commercial driver's license.