The US government just got a real-world lesson about the security risks posed by easily accessible drones. Officials report that they recovered a quadcopter on the White House's grounds in the early morning on January 26th, with no clear indication as to who flew it or why. A spokesperson notes that the drone was never a threat to President Barack Obama (who was visiting India) or his family, but that's not the point. The greater concern is that the Secret Service was apparently unaware of the drone until it was already on their turf. A more sinister pilot could have been using it to conduct espionage, deliver explosives or just to annoy the daylights out of White House staff.