How do customs know who to stop?

In the air passenger environment, air carriers transmit passenger information to CBP through the Advance Passenger Information System (APIS). CBP officers also rely on the Interagency Border Inspection System (IBIS) to determine which individuals to target for secondary examination upon arrival in the United States.



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CBP enrolls in-scope non-U.S. citizen travelers in the DHS Biometric Identity Management System (IDENT) as a biometric confirmation of arrival. Our traveler identity verification process is not a surveillance program.

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Having a flagged passport typically refers to a situation where a person's passport is marked or identified by authorities for special attention or scrutiny. This could be due to a variety of reasons, including legal, security, or administrative concerns.

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