Cancer, Sign of Comfort, rules conspiracies of domestic insecurity.

What does a scanner see? he asked himself. I mean, really see? Into the head? Down into the heart? Does a passive infrared scanner like they used to use or a cube-type holo-scanner like they use these days, the latest thing, see into me - into us - clearly or darkly?

-Philip K Dick, A Scanner Darkly

Examples

Wiretaps

Bugged phones