491、( )4.Customs Customs procedures for ariving passengers at many international airports are separated into Red and Green Channels.Passengers with goods to declare， that is， passengers cary items above the permitted customs limits or cary prohibited items should go through the Red Chanel.Passengers with nothing to declare， that is， passengers cany goods within the customs limits only and not carry prohibited items can go through the Green Channel.Passengers going through the Green Channel are only subject to spot checks.However， if a passenger going through the Green Chanel is found to have goods above the customs limits or carrying prohibited items， they may be prosecuted for making a false declaration to customs.Airports within the EU also have a Blue Channel.As the EU is a customs union， travelers between EU countries do not have to pay customs duties.Passengers ariving from other EU counties should go through the Blue Channel， where they may still be subject to checks for prohibited or restricted goods.In addition， limitations exist on various tobacco and alcohol products being imported from other EU member states and use of the Blue Channel if those limitations are being exceeded would be inappropriatE. Which one is not belongs to prohibited items or within the customs limits .