I'd be 100% sure the US spy ones are state of the art, while the 2018 best buys on mini drones probably sell ones that last about 2 days.
It just shows though that the age of mini drones is almost upon us. They'll get smaller & smaller & harder to detect.
We're living in interesting times, what with CCTV cameras, cameras along toll roads. phones that can log your location even when turned off etc.
There's not as much privacy as there used to be. I know sometimes all the above are good things & helpful but I think society is going to have a problem for a while in trying to strike a balance.
