I had some missionary friends that took a trip to a northern town in Mexico. They came back with tons of pictures on their cameras of Mexican military in the backs of Jeeps with .50 cal machine guns mounted on them...also pics of heavily armed individuals in the streets wearing body armor.
While they were there they were staying in a Church with an orphanage in it. Just outside the front doors a man was gunned down right in the street. They were there for a weekend.
I think I'll be staying on the US side of the border...even though I'm not far from it...