California Code, Elections Code - ELEC § 19232

The Secretary of State shall review voting systems periodically to determine if they are defective, obsolete, or otherwise unacceptable. The Secretary of State has the right to withdraw his or her certification or conditional approval previously granted under this chapter of any voting system or part of a voting system should it be defective or prove unacceptable after such review. Six months' notice shall be given before withdrawing certification or conditional approval unless the Secretary of State for good cause shown makes a determination that a shorter notice period is necessary. Any withdrawal by the Secretary of State of his or her previous certification or conditional approval of a voting system or part of a voting system shall not be effective as to any election conducted within six months of that withdrawal.