The Arizona Secretary of State's Office knew before Tuesday's election that the registrations of about 390,000 Arizonans since November 2016 were not automatically updated when they changed the address on their driver’s licenses — a requirement under the
National Voting Registration Act of 1993, unless a voter opts out of such updates.
Some of those voters might, however, have cast provisional ballots, which can be counted if elections officials determine after the fact that they are legitimate.
Arizona elections officials say they have known for at least a decade that the state’s voter-registration system doesn't comply with the federal law designed to protect voters when officials purge the rolls. Attorneys with the American Civil Liberties Union of Arizona, which has sued the state, say Arizona has likely never fully met the requirements of federal voting-rights laws, specifically the NVRA.