Why is my passport chip not scanning?
Why is my passport chip not scanning? If you have a passport with a chip and an NFC enabled phone, you should be able to scan your passport chip. It might not be scanning because: you haven't aligned the NFC reader on your phone with your passport; or. your passport chip might not be working.
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.