Unmanned aerial vehicles, drones, have become President Barack Obama's weapon of choice. For a war-weary nation distracted by domestic issues like the faltering economy, drones ensure no U.S. casualties, but also no end to the debate about their legality. From Pakistan and Afghanistan to Yemen and Somalia, drones are used to kill enemies considered to be a significant threat to Americans. But Obama's Kill List raises deep concerns. Who is targeted? According to what criteria? All of this is decided in secret by the U.S. administration, which refuses to publicly acknowledge any of the estimated 500 strikes that have occurred since Obama came to power.