for exports A unique identification marking shall be affixed to or form part of each package of tobacco product or processed tobacco that is exported, or sold for export, that distinguishes it from those products or processed tobacco intended for sale or distribution within the United States. The Secretary shall by regulation prescribe the size, location, and other characteristics of such marking, and it may contain a serial number that is assigned to the country of export, except that no such serial number shall be required on tobacco products or processed tobacco sold at retail to consumers by duty free stores for consumption beyond the jurisdiction of the internal revenue laws of the United States. Such tobacco products or processed tobacco shall instead bear markings indicating the tobacco product or processed tobacco is only for duty-free sale to consumers, as prescribed through regulation by the Secretary, before the product or processed tobacco is removed. (4) Authorization of federal unique identification marking Not later than 3 years after the date of the enactment of the Tobacco Excise Tax and Parity Act of 2017 , the Secretary shall by regulation require the use of a unique identification marking on all products subject to tax under this chapter. . (b) Unique identification marking Section 5723 is amended by adding at the end the following new subsection: (f) Unique identification marking (1) In general No tobacco product or processed tobacco may be sold, offered for sale, distributed, mailed, or otherwise delivered for final sale to any consumer in the United States unless the unique identification marking that meets the requirements of this section (and any regulations prescribed thereunder) is affixed to or forms part of the package in which it is contained. (2) System specifications (A) The Secretary shall design such system to coordinate and avoid interference with State, local, and Indian tribal tax stamps and markings, facilitate collection of the tax imposed by this chapter, impede contraband