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Customs officials are federal workers who are employed by the United States Customs and Border Protection (an arm of the Department of Homeland Security) to prevent terrorists and terrorist weapons from entering the United States, enforce laws governing imports and exports, and to combat smuggling and revenue fraud. The Customs and Border Protection (CBP) generates revenue for the government by assessing and collecting duties and excise taxes on imported merchandise. Amid a whirl of international travel and commercial activity, customs officials process travelers, baggage, cargo, and mail, as well as administer certain navigation laws. Stationed in the United States and overseas at airports, seaports, and all crossings, as well as at points along the Canadian and Mexican borders, customs officials examine, count, weigh, gauge, measure, and sample commercial and noncommercial cargoes entering and leaving the United States. It is their job to determine whether or not goods are admissible and, if so, how much tax, or duty, should be assessed on them. To prevent smuggling, fraud, and cargo theft, customs officials also check the individual baggage declarations of international travelers and oversee the unloading of all types of commercial shipments. The CBP employs 21,394 border patrol agents, 1,215 air and marine agents, 21,790 officers, and 2,366 agriculture specialists.