Forced labor import prohibition.

Section 307 of the Tariff Act of 1930, codified at 19 U.S.C. 1307, bars entry of goods made wholly or in part with forced labor, and the Uyghur Forced Labor Prevention Act turns that into a presumption: goods mined, produced or manufactured wholly or in part in the Xinjiang Uyghur Autonomous Region, or by an entity on the UFLPA Entity List, are presumed prohibited until the importer rebuts it (CBP). The burden falls on the importer of record, which in a POD chain is whoever brings the blanks in, not the brand that prints on them. Cotton is the exposed fibre because its chain is long and crosses borders at every step: field, gin, spinner, mill, cut-and-sew, and a shirt sewn in a third country is not cleared by that fact alone. Rebutting means documents traced back to the raw fibre, purchase orders, invoices, transport records and mill production records, and a supplier's assurance letter on its own does not carry it. A detained shipment waits until that file exists, which for a print-to-order shop means the blanks booked against next week's orders sit in a warehouse it cannot draw from.