Anyone who imports or exports goods is required to file with the Customs and has to get Customs permission. Upon entry, the Customs checks the documents and examines the goods, if necessary. 　The examination methods vary. For example, scientific analysis using the latest techonology may be conducted depending on the nature of the goods. 　Travellers' baggage is also subject to the Customs clearance procedures, and the procedures are simplified compared to those of commercial cargoes. 　Travellers can import certain amounts of goods without paying duties. Duty free allowance for travellers is set by value or quantity of goods.