Border Agents rude and difficult at Nogales

I have been to thirteen different countries, the only trouble have ever had was an uppity female Miami customs agent, who was fine until she realized I was not opening one of my boxes. It was the only one she wanted to "look" in. It was also the only one with "classified" markings on it. I showed her my military courier card and ask to talk to her supervisor, I was apologized to and sent on my way. From then on every time I have come back into the US I have had some form of inspection (I must be 'in the system'), I am polite and expect it. Never have had any trouble, it has been painless, I think mostly it is attitude, Don't try to hide anything, don't be rude, and just let them do the job they are being paid to do.

I am looking forward to a couple of winters in Mexico, I have never wanted to until I started reading this forum, now I am looking forward to it.