What?!!!!!!!!!!!!!!! Come on man, think out side the box. Even I could effectively seal the borders with our military and milita. It's not that hard. It wouldn't even take 24 hours. It should have been done YEARS ago! But now it's too late. Sure, a couple here and there would get through now and again - that's the law of averages - but nothing like the thousands that come through daily. And what if just 0.5% of hundreds or thousands/day are Islamic terrorist? I bet this is a very conservative estimate at that. Multiply this times God knows how many years of days now and we have good reason to quit fighting amongst ourselves and drivelling over acedemic labels like GOP, Libertarian, and conservative.
Even in Viet Nam, rolled razor wire stacked high, perimeter towers, lights, tin cans tied in the wire, dogs on patrol, motion sensors, you name, Charlie still got in occassionally.
Even fences can be scaled or tunneled under.
So no, there is no foolproof method.
Don’t forget, there would still be flights in from every country and ho would you identify unknown terrorists before the struck?
So yes, we do need to do much more on the border, but that can only be the first layer and as Bush said, we have to be right 100% of the time, they only need to be right once.