Going to have to agree with you here (bet you didn't see that coming :) ) -- I don't see a foreign country sending drones over the Continental US, simply due to the huge distances involved. They would be very easy targets inbound. And the people Les226 is talking about are not affiliated with an actual country; they're ... err.. "independent". So they would have even less ability to cause harm to us. And yes, while every technology we make is eventually mastered by other countries, it's pretty easy to figure out when and where that technology is being developed. We can, rather effectively, prevent certain tech from getting to people we don't want to have it.