What is the difference between immigration checkpoints at airports and on highways?

The Associated Press

U.S. Border Patrol Senior Agent B.T. Hick and his dog Mirza, left, inspect a car at a check point outside Organ Pipe Cactus National Park in Why, Ariz., Wednesday, May 24, 2006. The detention of a prominent immigration activist at a Texas airport served as a reminder of the latitude the Border Patrol has in conducting checkpoints for drugs and immigrants in the country illegally at locations not on the border. (AP Photo/Matt York, File)

Associated Press + More

A: No. There are two immigration agencies that operate at airports. One is Customs and Border Protection, which places agents at all international airports. The other is the U.S. Border Patrol, which falls under the umbrella of CBP. Border Patrol agents work mostly in airports that are within 100 miles of the border. Customs agents use an electronic system to determine whether someone is legally allowed to travel into the United States, and they are the agents travelers typically see when they return from overseas trips.

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