There may be international sanctions against Iran, but not in Afghanistan's border provinces with the Islamic Republic where trade and money-laundering are thriving. Every day, millions in Iranian currency are brought in by taxis ferrying passengers. The Iranian money is exchanged for dollars, which are then shipped back to Iran. American officials recently ordered the Afghan banks to crack down on this phenomenon and it appears to be having some effect. But Afghan money changers claim the money-laundering will never stop unless border guards stop accepting bribes and letting the Iranians in.