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"The wealth of the universe is all over your head. We need to take command of the solar system to gain that wealth..."
- Larry Niven

Microtransmitter Dot  
  A tiny transmitter placed on ID cards, used to track ID holders.  

Kathy turned on a bright, small light, laid three forged documents in the circle of its glare. 'A purple dot on the margin of each,' she said, indicating the almost invisible circle of color. 'A micro transmitter, so you'll emit a bleep every five seconds as you move around. They're after conspiracies; they want the people you're with.'
From Flow My Tears, The Policeman Said, by Philip K. Dick.
Published by Doubleday in 1974
Additional resources -

It is possible to have them removed:

He tapped his vest pocket of forged ID cards. 'With their micro transmitters, if that much is true.'

'Give them back to me,' Kathy said, 'and I'll erad the micro transmitters for you.'

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  More Ideas and Technology from Flow My Tears, The Policeman Said
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to Flow My Tears, The Policeman Said
  Tech news articles related to works by Philip K. Dick

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