Stories like this one about the endemic drug war corruption gripping Mexican law enforcement are a dime a dozen. But I don't get bored reading them, because there's always a new and compelling example of what a mess all of this is:

Reporting from San Luis Potosi, Mexico -  The lie-detector team brought in by Mexico's top cop was supposed to help clean up the country's long-troubled police. There was just one problem: Most of its members themselves didn't pass, and a supervisor was rigging results to make sure others did. [LA Times]

Yeah, it's awfully hard to purge corruption when the people in charge of investigating it are corrupt themselves. It's insane to spend a billion dollars trying to fix Mexican law enforcement, when the cartels can just spend more to make sure it stays broken.