or customs duties on imports of goods. The duty is levied at the time of import and is paid by the importer of record. Customs duties vary by country of origin and product. Goods from many countries are exempt from duty under various trade agreements. Certain types of goods are exempt from duty regardless of source. Customs rules differ from other import restrictions. Failure to properly comply with customs rules can result in seizure of goods and criminal penalties against involved parties. United States Customs and Border Protection ("CBP") enforces customs rules. Import of goods Goods may be imported to the United States subject to import restrictions. Importers of goods may be subject to tax ("customs duty" or "tariff") on the imported value of the goods. "Imported goods are not legally entered until after the shipment has arrived within the port of entry, delivery of the merchandise has been authorized by CBP, and estimated duties have been paid." Importation and declaration and payment of customs duties is done by the importer of record, which may be the owner of the goods, the purchaser, or a licensed customs broker. Goods may be stored in a bonded warehouse or a Foreign-Trade Zone in the United States for up to five years without payment of duties. Goods must be declared for entry into the U.S. within 15 days of arrival or prior to leaving a bonded warehouse or foreign trade zone. Many importers participate in a voluntary self-assessment program with CBP. Special rules apply to goods imported by mail. All goods imported into the United States are subject to inspection by CBP. Some goods may be temporarily imported to the United States under a system similar to the ATA Carnet system. Examples include laptop computers used by persons traveling in the U.S. and samples used by salesmen. Origin Rates of tax on transaction values vary by country of origin. Goods must be individually labeled to indicate country of origin, with exceptions for specific types of goods. Goods are considered to originate in the country with the highest rate of duties for the particular goods unless the goods meet certain minimum content requirements. Extensive modifications to normal duties and classifications apply to goods originating in Canada or Mexico under the [North American Free Trade Agreement]. Classification All goods that are not exempt are subject to duty computed according to the Harmonized Tariff Schedule published