19 CFR 182.16: Effect of noncompliance; failure to provide documentation regarding transshipment.

(a) General. If the importer fails to comply with applicable requirements under this subpart, including submission of a complete certification of origin prepared in accordance with §§ 182.12 and 182.14, when requested, CBP may deny preferential tariff treatment to the imported good.

(b) Failure to provide documentation regarding transshipment. Where the requirements for preferential tariff treatment set forth elsewhere in this subpart are met, CBP nevertheless may deny preferential tariff treatment to an originating good if the good is transported outside the territories of the USMCA countries, and at the request of CBP, the importer of the good does not provide evidence demonstrating to the satisfaction of CBP that the transit and transshipment conditions set forth in Appendix A of this part were met.