What's a drug used to deworm livestock—a drug that can obliterate your immune system—doing in your cocaine?

One of the last studies on levamisole use in humans was in 2001, when Iranian researchers gave the drug to a group of girls who lived in crowded, unhygienic conditions with uncontrollable lice infestations.

The report goes on to claim that the CSP can even detect which valley the cocaine has come from: In 2009, for example, 0.4 percent of the cocaine in the U.S. came from Peru's Cuzco/Apurímac valleys and 1.3 percent came from Peru's Huallaga/Ucayali valleys, a couple hundred miles away. During the fourth quarter of 2009, 97 percent of the cocaine in the U.S. came from Colombia and 1.5 percent from Peru.

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Cocaine, the perfect drug for a brittle and anxious Britain