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After 42 years, identical twins Molly Schleeter and Ellen Zwiefel are still amused by the confusion evoked by their matching blue eyes and dark brown hair. But their mirror images recently brought some unwanted attention. Last month, each of the sisters received a letter from state Driver and Vehicle Services, asking the women to visit the agency's St. Paul office to "discuss the accuracy of the information listed on your driving record." The letter also came with a warning that their driver's licenses would be canceled if they didn't respond within 30 days. "They made us fearful, like we had to prove our identity," said Schleeter, a stay-at-home mom who lives in Medina. Schleeter and Zwiefel were snared by a state program aimed at cracking down on identity theft. In 2008, using facial recognition software, the state started checking 11 million photos shot for driver's licenses and other identification cards over the past 10 years. Officials are looking for duplicate images and other irregularities that could lead to people creating multiple identities for fraudulent purposes. An initial search of photos revealed a total of 1.2 million suspect photos. Those images are supposed to be reviewed by human eyes before any warning letters are sent, said Pat McCormack, director of Driver and Vehicle Services. She said Schleeter and Zwiefel shouldn't have gotten letters because someone should have noticed that they have the same birth date. So far, there have been four cases of identical twins causing confusion for the software, she said. Altogether, the state has canceled 2,700 driver's licenses after the system flagged questionable photos or other problems, mostly because the license holder didn't respond to the state's letter. But workers still have another million photos to review, so that number is likely to climb. Schleeter and Zwiefel are still alarmed that they were singled out without being told why. When they responded to the letter and asked if they could go to a closer location, they said they were told "no." That was the wrong answer, McCormack said. Anybody who gets a warning letter should be able to visit a convenient location. McCormack said Schleeter and Zwiefel should have been accommodated. The sisters were able to skip the trip, however, after they persuaded a state official to pull their records and confirm their status as identical twins. McCormack said the state will be "making some changes to ensure we don't unduly upset people." The review, funded with an $800,000 federal grant, is expected to wrap up next June.