Washington State Supreme Court upholds signature verification on ballots
Mar 6, 2025, 9:23 AM | Updated: 2:29 pm
The Washington Supreme Court ruled Thursday that the state’s signature verification process for mail-in ballots is constitutional, rejecting a legal challenge that argued the system disenfranchises voters.
“We conclude that at least when coupled with the increasingly expansive cure system, signature verification, on its face, does not violate our state constitution,” Justice Steven C. González wrote for the Court.
The decision comes in the case Vet Voice Foundation v. Hobbs, in which plaintiffs contended that signature verification disproportionately results in ballot rejections for certain voters and violates state constitutional protections.
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Why were signature verifications challenged in Washington elections?
The lawsuit was brought by left-wing political groups Vet Voice Foundation, Washington Bus, El Centro de la Raza, and several individual voters. They sued Secretary of State Steve Hobbs and King County election officials in 2022.
The plaintiffs argued that Washington’s process of verifying voter signatures against registration records violates state constitutional protections, including the right to free and equal elections, due process, and privileges and immunities.
Washington is a vote-by-mail state, meaning that nearly all ballots are cast outside of polling places. To prevent fraud, election workers must compare the signature on each ballot declaration with the voter’s signature on file. If the signatures do not appear to match, the ballot is flagged, and voters are given a chance to “cure” their ballots by submitting additional verification. If voters fail to complete the process, their votes are not counted.
The plaintiffs contended that this system leads to the wrongful rejection of thousands of ballots, particularly those from young voters and voters of color, whose rejection rates are higher than those of white or older voters. They sought an injunction to block the use of signature verification in future elections.
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The legal arguments
Vet Voice Foundation relied on a report suggesting that signature matching is inherently unreliable when conducted by non-experts in a high-volume setting. Dr. Linton Mohammed, a handwriting expert, testified that professional handwriting analysis takes hours per signature, while election workers typically review each ballot in seconds.
The plaintiffs also presented evidence that signature rejections disproportionately affect young and minority voters. A state audit found that in the 2020 election, ballots from black voters were rejected at a rate nearly four times higher than those from white voters.
The state defended signature verification as a necessary safeguard for election integrity.
Hobbs and King County election officials argued that Washington’s vote-by-mail system needs a mechanism to verify voter identity without requiring in-person ID checks, which could be a greater burden for voters. Expert witnesses for the state, including election security officials, said that while signature verification is not perfect, it remains the best option for preventing fraudulent voting without creating barriers to participation.
Additionally, the state pointed to improvements in the ballot curing process, including expanded outreach efforts to help voters resolve signature issues. The legislature recently passed measures requiring election offices to use text messages, phone calls, and emails to notify voters of problems with their ballots.
Here’s what the Washington Supreme Court decided
The Washington Supreme Court ruled in favor of the state, concluding that signature verification does not facially violate the state constitution. Indeed, the justices “concluded signature verification survives any level of scrutiny.”
Writing for the court, Justice González acknowledged concerns about ballot rejections but emphasized that the system includes multiple safeguards, particularly the ability for voters to cure their ballots.
The Washington State Supreme Court applied strict scrutiny, the highest level of judicial review, assuming without deciding that the process imposed a substantial burden on voters. Even under this standard, the justices determined that signature verification serves a compelling state interest in election security and is narrowly tailored to meet that goal.
“We are pleased with the court’s ruling, which affirms our commitment to secure, accessible, and transparent elections in Washington,” Secretary of State Steve Hobbs said in a press release. “Signature verification has been a fundamental part of our state’s vote-by-mail system for decades, helping to protect against fraud while ensuring that every eligible voter’s ballot is counted.”
