CA Elec Code Section 2118.5

(a)

If a voter is erroneously assigned to a precinct, the voter may apply to the elections official for a certificate showing the record of registration. The elections official shall give the voter the certificate on or before election day. Upon presentation of this certificate to the precinct board of the proper precinct, the board shall permit the voter to vote. If the voter does not obtain the certificate provided for in this section, and votes in the precinct into which the voter has been erroneously assigned by the elections official, and the election is contested, the voter’s vote shall not be rejected for those candidates and on those measures with respect to which the voter would have been entitled to vote had the voter voted in the proper precinct, and no inquiry shall be made as to how the voter voted for those candidates or on those measures.

(b)

No voter who receives a certificate of registration under this section shall be charged a fee by the elections official.