In any action or arbitration proceeding to determine whether an insured shall be entitled to recovery of damages under uninsured motorist coverage, the certificate of the Department of Motor Vehicles that the owner or operator of the motor vehicle alleged to have been an uninsured motor vehicle at the time of the accident has not established financial responsibility, as provided in Section 16020 of the Vehicle Code, shall be admissible in evidence to create a rebuttable presumption that such vehicle was an uninsured motor vehicle at the time of the accident.
Source:
Section 11580.4, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=INS§ionNum=11580.4..