It's very possible that the series of U.S. law enforcement actions made the risks and costs too high to North Korea to keep counterfeiting. The first possibility is that they got out of the game. The second is that they got even better at it, and we just haven't caught them yet. [Conducting covert operations with counterfeit U.S. cash] would have the dual benefit of funding North Korea's operations and engaging in economic warfare against the United States. The Secret Service has been unequivocal that the North Korean supernotes are the best in the world.