Each year, billions of dollars in illegal narcotics circle the globe, feeding the demand of millions of users.

At every step, authorities try to intercept the drugs and apprehend their purveyors. In response, traffickers have developed a variety of inventive ways to obscure their illicit goods.

On the US-Mexico border, a preferred method among traffickers seems to be concealing drugs in shipments of food.

At the end of October, Customs and Border Protection agents found 3 pounds of meth hidden in a package of tortillas.