Australian journalist Tim Blair travels a bit, in the hopes of finding new and interesting roads to drive on, and recounts this personal experience:

I was recently stopped by authorities while driving through Arizona. An armed policeman, at a security checkpoint, demanded to know why I was in the state and asked to see my documentation. His colleague searched my car. Meanwhile, other vehicles — driven by locals — were allowed past with minimal interference. Eventually, after perhaps 15 minutes of questioning and searches, during which I remained under the gaze of several officers carrying machine guns, I was permitted to proceed. The entire process was entirely unnecessary and probably racist.

Oh, wait. That didn’t happen in Arizona. It happened in Mexico. [AUSTRALIAN RIGHTS THREATENED, Tim Blair — Thursday, April 29, 10 (03:23 am)]

There's more on Arizona.