The sky is the limit with drones. There are already working mini versions with mounted guns and self destruct systems capable of taking out vehicles when they get close enough. and taser drones.
so far the coolest drone technology i have seen, is when they put a fleet of predators in the air over a large area. and a computer program mixes everything together so that an agent/analyst can have a first person real time view on the ground 360 degrees without actually being there, and walk around like it was google street view…. but like i said… in real time.
technically thats invisibility i suppose.
Never be afraid to do the righteous thing, nothing righteous is ever easy.