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The law requires each voter to have a unique identifier. Since 2004, new registration applicants have had to provide a driver's license number or the last four digits of a Social Security number to register (voters who don't have them are assigned a unique number by the state). States are required to try to authenticate the numbers with motor vehicle records and the Social Security Administration database.But databases are prone to errors such as misspellings and transposed numbers, and applicants are prone to make mistakes or write illegibly on applications. The Social Security Administration has acknowledged that matches between its database and voter-registration records have yielded a 28.5 percent error rate.