According to estimates, about 80 percent of the world’s heroin originates from Afghanistan. But heroin consumed in the United States is different. Most of the heroin consumed here comes from Colombia or Mexico. As part of WBEZ’s series, ‘Heroin LLC,’ Martin Raithelhuber of the United Nations Office on Drugs and Crime joins us to explain why and fills us in on global heroin trends. (Photo: Associated Press)