TAIBAD, Iran (AP) — In the face of Afghanistan’s unprecedented boom in opium production, neighboring Iran is trying to baton down its border to slow down smuggling, building moats, walls and other large-scale projects. ... Neighboring Afghanistan has all the makings of a narco-state and is the main source of drugs coming into Iran and headed to other markets in Europe and the United States. Last year, 209,000 hectares (806 square miles) of poppies were planted across Afghanistan, up 36 percent over the year before. They produced an estimated 5,500 metric tons (6,062 tons) of opium, according to the United...