Cal. ELEC § 2172

(a) The elections official shall cancel any duplicate voter registrations that may exist as a result of a conditional registration deemed effective and shall cancel the duplicate registrations in accordance with Chapter 3 (commencing with Section 2200). (b) If it appears that a registrant may have committed fraud within the meaning of Section 18560, the elections official shall immediately notify in writing both the district attorney and the Secretary of State.