Anxiety over Drones

I read Lev Grossman's well-documented and pertinent article with great concern [Drone Home, Feb. 11]. Drone technology is spreading fast worldwide, and one never knows when or how it will land in the wrong hands. The consequences could be dreadful — as with all other weapons, it can be misused and abused in a deadly way. Imagine what extremists could do if they managed to possess or control a fleet of armed drones — some time, somewhere, somehow. Is there any pre-empting measure to contain proliferation?
Tan Boon Tee, CHUKAI,...