Rise of the drones: from policing the streets to painting your house

"Such is the hype. But for every tech company with its head in the clouds, there are problems to bring them back down to earth. “There are big technical challenges,” says Ryan Calo, a law professor at the University of Washington. “There’s a bunch of PhD theses that need to be completed before you can build a drone to autonomously police an area, find intruders, and use facial recognition to know who is meant to be there. Plus, having these things stay aloft beyond a few minutes is non-trivial.”"