19 CFR 182.76: Repeated false or unsupported preference claims.

Where the verification reveals a pattern of conduct by the importer, exporter, or producer of false or unsupported representations relevant to a claim that a good imported into the United States qualifies for preferential tariff treatment under the USMCA, CBP may withhold preferential tariff treatment under the USMCA for entries of identical goods covered by subsequent statements, declarations, or certifications by that importer, exporter, or producer until CBP determines that representations of that person are in conformity with this part and with General Note 11, HTSUS.