From Billboard Magazine
…his answer may soothe the judge's concerns, but how about the U.S. Secret Service, which is responsible for protecting against the counterfeiting of U.S. currency?
Robert Hoback, a spokesperson for the agency, wouldn't comment directly about [50 Cent]'s case, but did point out an FAQ on the Secret Service website pertaining to the rules for the printing, publishing and illustration of U.S. currency. The rules dictate that illustrations must be "less than three-fourths or more than one and one-half" the size of a real bill and that anything used in the making of an illustration must be "destroyed and/or deleted or erased after their final use."