Majority of U.S. Cocaine Supply Cut with Veterinary Deworming Drug | Popular Science.

Cocaine’s a hell of a drug, and even more so when laced with another drug that’s commonly used to deworm opossums. Federal agents have found that 69 percent of cocaine shipments seized entering the United States contain levamisole, a veterinary drug linked to serious weakening of the immune system in humans.

If you were looking for a chance to kick the cocaine habit, now seems as good a time as any — especially with a possible cocaine vaccine on the horizon. But we’d advise opossum owners to avoid cocaine as a substitute for deworming their pet.