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Barcode ID numbers on bank notes.

Why not print a barcode on bank notes, allowing the retailer to scan, using existing systems, that can then cross check the ID number against a national database. A time vs distance equation would then work out if the note has a double, as it can't be in 2, or more, places at once. Our treasurys spend so much money and time coming up with ways to stop fakes, but the criminals are never far behind, flooding shaky economies with to much money.

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