On Tuesday, Mexico’s president, Enrique Peña Nieto, visits Washington to hold talks with President Barack Obama on cooperation, economic and security issues such as the Merida Initiative.

Approved six years ago, the U.S. government appropriated $2.3 billion dollars for the plan, which called for the U.S. and Mexican governments to partner against crime that spreads across both country’s borders. It sounds like it should buy a lot of crime fighting. But only about half of the money promised by Congress has been used.

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