The late John D. MacDonald, one of my favorite authors, wrote the following in The Green Ripper in 1979. "We run a strange kind of country in the modern world. Customs and Immigration are in a sense token services. Any plausible-looking person can find many ways to come and go unimpeded. Anything that can be flown or floated can be brought in or taken out. We are but a wide place in the road in the middle of the world, and they wander through, back and forth, marveling at the lack of restraints. "It is a paradox. The openness which...