Verification of origin may suspend preferential tariff treatment pending response or justify denial of preferential claim. Proper officers may request verification of proof of origin when authenticity or origin criteria are doubtful, where preferential claims appear invalid, or randomly for due diligence. Requests must go through the designated nodal office, specify applicable timelines from the trade agreement or default to sixty days, and may include calls for additional information or verification visits under the Rules of Origin. During clearance, preferential treatment may be suspended; provisional assessment and release is permitted against security. Verification should be concluded within forty five days of receiving information unless agreement timelines or authorized extensions apply. Preferential claims may be denied for non response, non compliant information, or evidence of non origin.