Cal. Elec. Code § 2271

If a person who is ineligible to vote becomes registered or preregistered to vote pursuant to this chapter and votes or attempts to vote in an election held after the effective date of the person’s registration or preregistration, that person shall be presumed to have acted with official authorization and shall not be guilty of fraudulently voting or attempting to vote pursuant to Section 18560, unless that person willfully votes or attempts to vote knowing that the person is not entitled to vote.