When I last tooled around the violent areas of northern Mexico, I did so in a green Infiniti. Before that, a bright red 2002 Ford Focus SVT. Why those cars? Well, they were the ones we had on hand ... but we could also be pretty sure that nobody would be gunning for us, even with Texas and California plates.
So I read this post with some incredulity. Not the story. I completely believe that the Zetas would apologetically release USDA officials that they had accidentally detained on suspiscion of being narcos. What I do not believe is that the U.S. government would actually be dumb enough to put its officials in black suburbans. Caray.
This is not to say that it is impossible to travel incognito through cartel territory. It is not hard to project the impression that you are not involved in organized crime. In fact, it is rather easy. The secret, as you can see above, is to not try to hide ... while avoiding the obvious markets of a sicario or cartel honcho. Dress like a gringo sartorially aware Argentine or Spaniard normal person and you will likely be fine.