Anyone who has ever tramped through a dim, Escher-esque parking garage in search of a "lost" automobile might welcome an abracadabra technology that could help locate it.
But what if that magic involved an array of 24/7 surveillance cameras and was also available to police and auto repossessers? What if it could be tapped by jilted lovers, or that angry guy you accidentally cut off in traffic? Would the convenience be worth the loss of privacy?
Those are some of the questions civil libertarians and others are asking as technology capable of spying on motorists and pedestrians is converted to widespread commercial use.