This is actually fairly common. They could be searching for anything from contacts with terrorists to evidence that the person lied on their visa application.
Prior SCOTUS rulings have held that until you clear customs and immigration you are technically NOT in the U.S., and thus Fourth Amendment protections don’t apply.
“Prior SCOTUS rulings have held that until you clear customs and immigration you are technically NOT in the U.S”
If that’s true then we can throw all the so called asylum seekers the F out immediately. Technically they were never on US soil so they never entered and are not subject to the cock-a-mamy Dum-o-crat laws on asylum. Toss their fannies back across the border. With prejudice.