7 CFR 322.33: Restricted articles in a commercial bonded vehicle arriving at a land border port in the United States.

If you import a restricted article through a land border port in the United States by commercial vehicle (i.e., automobile or truck), then the person carrying the package containing the restricted article or the driver of the vehicle must present the export certificate required by § 322.30 (if applicable) and an invoice or packing slip accurately indicating the complete contents of the shipment to the inspector at the land border port.