International law enforcement can work without any involvement from the U.N. Security Council (“UNSC”). Cooperation between nations does not require a formal organizational structure or extensive international bureaucracy, and bypassing this establishment would reduce the delay or inaction caused by the veto of the UNSC’s permanent members. One way to improve international law would be to look at the relative success of the Proliferation Security Initiative (“PSI”). This Idea will proceed in three parts. Part II will discuss the dangers of the international proliferation of weapons of mass destruction (“WMD”), particularly with regard to rogue states and international terrorists. Part III will discuss why it has been difficult for the U.N.- centered system to effectively respond to these concerns; and will describe the PSI’s effort to overcome them. Part IV will address criticism of the PSI.