He has been working on data standards since 1999 but found that reaching agreement on a global standard proved impossible with all the competing interests among standards bodies, commercial and financial services networks combined with a lack of interest from banks which had already developed more or less satisfactory identification systems of their own.

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Provisional ballots are issued in Ohio when voters lack proper identification or are using the last four digits of a Social Security number as proof of ID.

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In objecting to the Texas law, the Justice Department said it reviewed the state's own statistics showing 600, 000 registered voters lack a driver's license or another form of government identification.

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