No, it's not a matter of resources. You are right. The largest number of foreign nationals who do show up at our borders show up at airports. That's the bulk of the traffic we have there.
You have people trying to take advantage of the refugee system here, but again it's a difficult question to answer because when they show up at a few...we do in fact interact with those people. All travellers showing up at an airport have some sort of interaction with an officer.