19 C.F.R. § 10.616
(a) Verification. A claim for preferential tariff treatment made under § 10.583(b) or § 10.591 of this subpart, including any statements or other information submitted to CBP in support of the claim, will be subject to such verification as the Center director deems necessary. In the event that the Center director is provided with insufficient information to verify or substantiate the claim, or the exporter or producer fails to consent to a verification visit, the Center director may deny the claim for preferential treatment. A verification of a claim for preferential tariff treatment under CAFTA-DR for goods imported into the United States may be conducted by means of one or more of the following:
[CBP Dec. 08-22, 73 FR 33678, June 13, 2008, as amended by CBP Dec. 10-26, 75 FR 50700, Aug. 17, 2010]