Section 14245 Of Article 3. Challenging A Voter From California Elections Code >> Division 14. >> Chapter 3. >> Article 3.

. If the challenge is on the ground that the person challenged has already cast a ballot for this election, a member of the precinct board shall tender to the person challenged this oath: "You do swear (or affirm) that you have not previously voted in this election, either by vote by mail ballot or at a polling place."