At international airports, bags are checked at customs by Customs Officers (such as CBP Officers in the U.S., UK Border Force in Britain, or CBSA agents in Canada). It is important to distinguish between Security (who check for dangerous items like weapons before you fly) and Customs (who check for prohibited or dutiable goods after you land). After you collect your checked luggage from the carousel, you walk through the "Customs Hall." You generally have a choice between the Green Channel (nothing to declare) and the Red Channel (goods to declare). While many travelers walk through the Green Channel without stopping, customs officers use "risk-based" profiling and X-ray technology to perform random or targeted spot checks. They are looking for items that exceed duty-free limits (like alcohol or tobacco), illegal drugs, large amounts of undeclared cash (typically over $10,000), and prohibited agricultural products like fruit or meat that could carry pests. Being dishonest with a customs officer can lead to heavy fines, confiscation of goods, and even the loss of "Trusted Traveler" status like Global Entry.