When the 'War on Drugs' got literal, and how it could end

Drug cartel weaponry has gotten deadlier. In 2015, a Mexican army helicopter was shot down in the state of Jalisco. The local cartel used a rocket-propelled grenade to do it. And for years, drug gangs have worked on their navies, moving from cigarette boats to homemade submarines. They have air forces, as well, and fight pitched battles against the army in Mexico and other places. But things are changing.

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