Passenger processing obligations ensure customs facilitation and enforcement against smuggling and prohibited exports from travelers at ports Customs process incoming international passengers post-immigration to provide facilitation while preventing smuggling, non declaration and mis declaration of dutiable, restricted or prohibited items. Customs must also prevent unlawful export of foreign currency, antiques, wildlife, narcotics and psychotropic substances and enforce related allied laws in respect of goods carried on the person, in hand baggage or accompanied baggage before those goods enter or leave the country.