The dystopian fears these metal sentinels provoke might force us to get serious about new legal protections. Indeed, writes Gene Healy, Americans are becoming increasingly unsettled by this sort of military "mission creep." In February, a Rasmussen poll found voters opposed to the use of drones for domestic surveillance, 52 to 30. They're right to be nervous. As James Madison warned at the Constitutional Convention, "The means of defense against foreign danger have always been the instruments of tyranny at home."