What will it look like when drones (like those envisioned by Amazon’s Prime Air) come to U.S. airspace?

In this property-rights-obsessed nation, it turns out you actually don’t have a clear right to shoot down a drone hovering low over your backyard unless it’s putting you in imminent physical danger.

“You have to acknowledge in this day and age that stuff flies over your house,” Ryan Calo, a professor at the University of Washington who specializes in robotics and the law, told me. That puts him at odds with conservative commentator Charles Krauthammer, who voiced a more typical reaction on Fox News last year: “The first guy who uses a Second Amendment weapon to bring a drone down that’s been hovering over his house is going to be a folk hero in this country.”