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"No one has ever produced a statement of fact that was technically true. The most accurate statements of science we have today are accurate to only 15 decimal places."
- Bart Kosko

Radiant Shield  
  A device that would effectively prevent an implanted radiant from being detected or read.  

The radiant is a chip or device that is injected into the shoulder; it provides position and information to anyone equipped with the proper viewer.

Unless, of course, you make use of available countermeasures. Aile Farr did so, when necessary.

Everywhere that Farr went, the radiant in his right shoulder sent up a signal. On the viewer screen, Farr was as surreptitious as a lighthouse.

He went to the stereo-screen and called Kirdy...

"How can I shield it?"

"Stay where you are, I'll send a man down with a shield."

The messenger presently arrived. Farr went into the men's room and wrapped a pad of woven metal around his shoulder and chest.

"Now," said Farr grimly. "Now we'll see."

From The Houses of Iszm, by Jack Vance.
Published by Better Publications in 1954
Additional resources -

Vance's "radiant" is essentially an RFID chip, a small electronic device with a bit of memory to carry information and an antenna to transmit that information to a suitable reader.

RFID chips can be blocked or shielded with metal foil; a tightly woven mesh of metal should also work. This kind of "passive" shield is more reliable than a transmitter that jams the chip's return signal.

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Additional resources:
  More Ideas and Technology from The Houses of Iszm
  More Ideas and Technology by Jack Vance
  Tech news articles related to The Houses of Iszm
  Tech news articles related to works by Jack Vance

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