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" I try to sit down at the typewriter four times a day, even if it's only five minutes, and write three sentences. And if I feel like going on, or if something turns me on I'll just keep writing till I'm written out."
- Roger Zelazny

Probe Screen Hood  
  A device that blocks attempts to see into the contents of the brain mind.  

When some humans gain telepathic abilities, they try to subjugate the normals. Should people with the power to determine with certainty the contents of your mind also have the political power to control you and control society?

He had done nothing disloyal. Nothing, except open the morning mail, find the hood, deliberate about it, and finally put it on. He remembered the small instruction tag:

GREETINGS! This probe screen is sent to you with compliments of the maker and the earnest hope that it will be of some value to you. Thank you.

...Should he wear it? He had never done anything. He had nothing to hide - nothing disloyal to the Union. But the thought fascinated him. If he wore the hood his mind would be his own. Nobody could look into it. His mind would be long to him again, private, secret, to think as he wished, endless thoughts for no one else's consumption but his own...

There was some sort of an Anti-Immunity bill up in Congress to make wearing of a probe screen a felony, but it hadn't been passed yet-

From The Hood Maker ('Immunity'), by Philip K. Dick.
Published by Imagination in 1955
Additional resources -

Here's another bit:

He tapped his hood. "This alloy - opaque to probes. Discovered by accident, by one of these men. Teeps came after him instantly, but he escaped. "The teeps can't file a framed report on a man whose mind is opaque to probes... The teeps have to get the hoods off... If a man is innocent why shouldn't he want his mind probed? The bill makes wearing a probe shield a felony."

"Teeps" are telepathic humans.

This is a very early reference to the idea of a "tin foil hat." I can find quotes for the opposite idea - see the entry for the Control Helmet from a 1938 story by Edmund Hamilton. Can you find an earlier reference?

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Additional resources:
  More Ideas and Technology from The Hood Maker ('Immunity')
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to The Hood Maker ('Immunity')
  Tech news articles related to works by Philip K. Dick

Probe Screen Hood-related news articles:
  - 'Brain Breathalyzer' For Astronauts
  - Thought-Screen Helmets A Classic American Craft

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