California Code, Elections Code - ELEC § 2301

(a) An international election observer may be provided uniform and nondiscriminatory access to all stages of the election process that are open to the public, including the public review period for the certification of a ballot marking system, the processing and counting of vote by mail ballots, the canvassing of ballots, and the recounting of ballots. An international election observer shall not interfere with a voter in the preparation or casting of the voter's ballot, with a precinct board member or an elections official in the performance of his or her duties, or with the orderly conduct of an election.

(b) For purposes of this section, “international election observer” means a person who witnesses the administration of an election in this state and who is an official representative of an international organization such as the United Nations, the Organization for Security and Cooperation in Europe, or the Organization of American States.