The arrest and extradition of Bout serves as a warning to other arms traffickers and underscores the global reach of the world’s military superpower. This may deter some traffickers and drive up prices, though the opposite may also be true: removing Bout could be good for business. The US government, and its European allies, took their eye off Bout after 9/11. Some law-enforcement officials thought this was a mistake. Now they have their man.