California Code, Government Code - GOV § 19704

(a) It is unlawful to require, permit, or suffer any notation or entry to be made upon or in any application, examination paper, or other paper, book, document, or record used under this part indicating or in any way suggesting or pertaining to any basis listed in subdivision (a) of Section 12940, as those bases are defined in Sections 12926 and 12926.1.

(b) Notwithstanding subdivision (a), subsequent to employment, ethnic, marital status, and gender data may be obtained and maintained for research and statistical purposes when safeguards preventing misuse of the information exist as approved by the Civil Rights Council, except that in no event shall any notation, entry, or record of that data be made on papers or records relating to the examination, appointment, or promotion of an individual.