The Obama administration has approved a program that authorizes the CIA and the military to hunt and kill individuals who have suspected links to terrorism anywhere in the world, even in countries that are far away from any war zone or battlefield. Key details about the program -- including who can be targeted and how much evidence is required to put a name on the "kill list" -- remain secret. The policy violates international law and, at least when it comes to U.S. citizens, also violates the Constitution.