The Kardashians Can't Escape U.S. Customs After Costa Rica Trip

The Kardashians got a knock from a narc before officially touching US soil.

Kourtney, Kris, Kylie and Tyga returned after a short trip in Costa Rica but had to deal with U.S. Customs agents getting a look inside before getting the all clear.

It's standard procedure for Customs to do their thing after international flights ... but the visit comes on the heels of a controversial travel ban.