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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
- Larry Niven

Life Detector Shield  
  An electronic field that is intended to shield living tissue from a Life Detector.  

In this short story, there are sensors that will detect the presence of living beings. And as is always the case in the history of warfare, there is also a counter-weapon.

Hulser was back in the chill present, a deadly suspicion gnawing at him: The enemy has a new type of shield, not as good as ours. It merely reduces image size!

...another corner of his mind began to think about the shields, the complex flicker-lattice that made human flesh transparent...

From Cease Fire, by Frank Herbert.
Published by Conde Nast in 1958
Additional resources -

In the real world, there are various ways to detect the presence of living beings (most of them don't differentiate that well between animals and people). For example, there are sensors that will detect the presence of carbon dioxide, which we all give off when breathing. And there are infrared sensors, which detect our body heat.

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Additional resources:
  More Ideas and Technology from Cease Fire
  More Ideas and Technology by Frank Herbert
  Tech news articles related to Cease Fire
  Tech news articles related to works by Frank Herbert

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