Calvin Westfall, a 59-year-old vending machine owner from West Virginia, made a surprising discovery recently while sorting through the cash from one of his machines. Among the familiar stack of ...

Crooks trying to hide their crimes or identities by filing the telltale serial numbers and markings from firearms, cars, or bullet casings could soon have a new forensic technique to worry about: ...

Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...