Cal. Elec. Code § 2269

If a person who is ineligible to vote becomes registered 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, 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 he or she is not entitled to vote.