by Professor » Thu Jan 23, 2014 10:34 am
Well, as far as the legality goes, it'll be legal, until it's made illegal. Meaning, I think that it's legal under most laws, but would probably be specifically singled out and made illegal if it becomes a large-scale problem.
But, there is an argument for them being illegal already. Even in states that have generous "home defense" laws (where you can shoot anyone on your property, even if they aren't necessarily posing an immediate threat to your life), a homeowner may not install autonomous, lethal defense devices. For instance, you can't have a shotgun rigged to shoot whoever walks through the door.
A drone may not be "autonomous", but it's close. I could easily argue that a drone would not give you enough information to determine a threat level, and would therefore be autonomous in that sense. It's acting on your direction, but you don't have enough information to determine if a certain level of force is needed.
However, I think that holds true mostly for lethal force drones. If you had a drone that merely incapacitated someone (tazer, knockout gas, bean bag shooter, etc.), then I think it'd be perfectly legal. After all, it's fine to put up an electric fence (which is autonomous), so long as it doesn't deliver enough of a shock to kill.