California Code, Elections Code - ELEC § 8028

(a) Except as provided in subdivision (b), a candidate shall not remove a declaration of candidacy form from the office of the elections official, and the elections official shall require all candidates filing a declaration of candidacy to execute the declaration in the office of the elections official.

(b) A candidate may, in a written statement signed and dated by the candidate, designate a person to receive a declaration of candidacy form from the elections official and deliver it to the candidate. The statement shall include language indicating that the candidate is aware that the declaration of candidacy must be properly executed and delivered to the elections official of the county of the candidate's residence by the 88th day prior to the direct primary election. That statement shall be retained by the elections official.