In Foreign Policy magazine, there's a nice piece about the drug cartels in Mexico:
As the cartels have shrunk in number, the pressure on them -- from U.S. and Mexican authorities, and from their own competitors -- has increased apace, forcing the organizations to become better equipped and more violent. Today's Mexican cartels spend millions of dollars a year on assault rifles, explosives, armored high-end SUVs, and sophisticated intelligence operations, with the aim of avoiding interdiction and eliminating competitors.Worth a read.
This is the grand paradox of drug enforcement. Unless enforcement agencies can intercept virtually all of the drugs crossing the border -- something that approaches impossibility -- their efforts are likely to simply produce more formidable opponents. The cartels' profits will increase, and with them the dangers they pose to Mexican authorities and the Mexican population.