In a nation divided on almost every issue, there is one topic which brings almost universal agreement: travelers hate the experience they face at America's airports. Security is slow, inefficient, and at times downright humiliating, they complain.

Amtrak's "scanners" are dogs.......
"The machines would literally shut the system down," says John O’Connor, the Chief of the Amtrak Police. "You can put a canine in literally thousands of people moving through very quickly. And that dog will be able to detect if somebody has explosives."