Elections Code § 14297

(a) No later than the time at which the voter delivers the voted ballot, a precinct board member in charge of the voter list shall write in the space opposite the name of the voter the line number designating the position of the name on the roster. In those counties using a combined roster, the voter’s name shall be crossed off of the voter list in lieu of numbering.

(b) In an election conducted using vote centers, or if an electronic poll book is used, only the electronic roster shall be updated.