U.S. political leaders are increasingly calling for war on Mexican cartels to combat the crises at our southern border, but an unprecedented intelligence project reveals the front lines of this battle are where we least expect. A CBS Reports investigation found that Americans have been aiding narcos by smuggling military-grade weapons out of the U.S. into Mexico, at a scale and scope previously unreported — providing the firepower cartels need to operate with impunity. Watch more CBS Reports documentaries that dive into the key issues driving the national and global conversation at cbsnews.com/cbs-reports

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