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This story was originally copublished by ProPublica and The Texas Tribune, a nonprofit, nonpartisan local newsroom that informs and engages with Texans. Sign up for The Brief Weekly to get up to speed on their essential coverage of Texas issues.

When county clerk Brianna Lennon got an email in November saying a newly expanded federal system had flagged 74 people on the county’s voter roll as potential noncitizens, she was taken aback.

Lennon, who’d run elections in Boone County, Missouri, for seven years, had heard the tool might not be accurate.

The flagged voters’ registration paperwork confirmed Lennon’s suspicions. The form for the second person on the list bore the initials of a member of her staff, who’d helped the man register — at his naturalization ceremony. It later turned out more than half the Boone County voters identified as noncitizens were actually citizens.

The source of the bad data was a Department of Homeland Security tool called the Systematic Alien Verification for Entitlements, or SAVE.

Once used mostly to check immigrants’ eligibility for public benefits, SAVE has undergone a dramatic expansion over the last year at the behest of President Donald Trump, who has long falsely claimed that millions of noncitizens lurk on state voter rolls, tainting American elections.

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At Trump’s direction, DHS has pooled confidential data from across the federal government to enable states to mass-verify voters’ citizenship status using SAVE. Many of the nation’s Republican secretaries of state have eagerly embraced the experiment, agreeing to upload all or part of their rolls.

But an examination of SAVE’s rollout by ProPublica and The Texas Tribune reveals that DHS rushed the revamped tool into use while it was still adding data and before it could discern voters’ most up-to-date citizenship information.

As a result, SAVE has made persistent mistakes, particularly in assessing the status of people born outside the U.S., data gathered from local election administrators, interviews and emails obtained via public records requests show. Some of those people subsequently become U.S. citizens, a step that the system doesn’t always pick up.

According to correspondence between state and federal officials, DHS has had to correct information provided to at least five states after SAVE misidentified some voters as noncitizens.

Texas and Missouri were among the first states to try the augmented tool.

In Missouri, state officials acted on SAVE’s findings before attempting to confirm them, directing county election administrators to make voters flagged as potential noncitizens temporarily unable to vote. But in hundreds of cases, the tool’s determinations were wrong, our review found. Lennon was among dozens of clerks statewide who raised alarms about the system’s errors.

“It really does not help my confidence,” she said, “that the information we are trying to use to make really important decisions, like the determination of voter eligibility, is so inaccurate.”

In Texas, news reports began emerging about voters being mistakenly flagged as noncitizens soon after state officials announced the results of running the state’s voter roll through SAVE in October.

Our reporting showed these errors were more widespread than previously known, involving at least 87 voters across 29 counties. County election administrators suspect there may be more. Confusion took hold when the Texas secretary of state’s office sent counties lists of flagged voters and directed clerks to start demanding proof of citizenship and to remove people from the rolls if they didn’t respond.

“I really find no merit in any of this,” said Bobby Gonzalez, the elections administrator in Duval County in South Texas, where SAVE flagged three voters, all of whom turned out to be citizens.

Even counting people flagged in error, the first bulk searches using SAVE haven’t validated the president’s claims that voting by noncitizens is widespread. At least seven states with a total of about 35 million registered voters have publicly reported the results of running their voter rolls through the system. Those searches have identified roughly 4,200 people — about 0.01% of registered voters — as noncitizens. This aligns with previous findings that noncitizens rarely register to vote.

Brian Broderick leads the verification division of U.S. Citizenship and Immigration Services, the DHS branch that oversees SAVE. In an interview this month, he acknowledged the system can’t always find the most current citizenship information for people not born in the U.S. But he defended the tool, saying it was ultimately up to states to decide how to use SAVE data.

“So we’re giving a tool to these folks to say, ‘Hey, if we can verify citizenship, great, you’re good. If we can’t, now it’s up to you to determine whether to let this person on your voter rolls,’” Broderick said.

In Texas, Secretary of State Jane Nelson declined an interview request. Her spokesperson, Alicia Pierce, said the office hadn’t reviewed SAVE’s citizenship determination before sending lists to counties because it isn’t an investigative agency. In a statement, Pierce added that the use of SAVE was part of the office’s “constitutional and statutory duty to ensure that only eligible citizens participate in Texas elections.”

A spokesperson for Missouri Secretary of State Denny Hoskins called SAVE a valuable resource even though some people it flagged might later be confirmed as citizens. “No system is 100% accurate,” Hoskins said in an interview, “but we’re working to get it right.”

Asked whether it was problematic that his office directed clerks to temporarily bar voters from casting ballots before verifying SAVE’s findings, Hoskins said that was a “good point.”

While 27 states have agreed to use SAVE, others have hesitated, concerned not only about inaccuracies, but also about privacy and the data’s potential to be used in immigration........

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