The drones have been successful because it is almost silent, and can operate in dark of the night.
"Gee! It looks as though that total electric house had a gas leak."
18 posted on 03/07/2013 6:38:58 AM PST by N. Theknow
(Kennedys=Can't drive, can't ski, can't fly, can't skipper a boat, but they know what's best for you.)