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"If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction."
- Frederik Pohl

  A small portable device that acquired holographic surveillance images.  

Also, this gave the authorities the opportunity to do a little illegal searching above and beyond what their undercover people did when no one was looking. They got to pull out bureau drawers to see what was taped to the backs. They got to pull apart pole lamps to see if hundreds of tabs sprang out. They got to look down inside toilet bowls to see what sort of little packets in toilet paper were lodged out of sight where the running water would automatically flush them. They got to look in the freezer compartment of the refrigerator to see if any of the packages of frozen peas and beans actually contained frozen dope, slyly mismanked. Meanwhile, the complicated holo-scanners were mounted, with officers seating themselves in various places to test the scanners out. The same with the audio ones. But the video part was more important and took more time. And of course the scanners should never be visible. It took skill to so mount them. A number of locations had to be tried. The technicians who did this got paid well, because if they screwed up and a holo-scanner got detected later on by an occupant of the premises, then the occupants, all of them, would know they had been penetrated and were under scrutiny, and cool their activities. And in addition they would sometimes tear off the whole scanning system and sell it.
From A Scanner Darkly, by Philip K. Dick.
Published by Not Known in 1977
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