Section 14287 Of Article 4. Issuing Ballots And Voting From California Elections Code >> Division 14. >> Chapter 3. >> Article 4.

. No voter shall place personal information upon a ballot that identifies the voter. "Personal information" includes all of the following:
  (a) The signature of the voter.
  (b) The initials, name, or address of the voter.
  (c) A voter identification number.
  (d) A social security number.
  (e) A driver's license number.