Imagine police drones patrolling at treetop level down city streets, their cameras scanning crowds for weapons or suspicious activity. “Newsbots” might follow in their wake, streaming live video of the goings-on. Drones belonging to protest groups hover over both, watching the watchers. In nearby zip codes, drones belonging to real estate agents scope out hot properties. Robots deliver pizzas by following the signal from customers’ cell phones. Meanwhile, anti-drone “freedom fighters,” alarmed by the spread of cheap, easy overhead surveillance, take potshots at the robots with rifles and shotguns.