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"The SF approach: an awareness that things could have been different, that this is one of many possible worlds, that if you came to this world from some other planet, this would be a science fiction world."
- Neal Stephenson

Tuned-Laser Decontamination  
  Process to destroy foreign biomolecules within the body.  

Traveling between worlds, you need a way to make sure that you do not bring contaminants with you.

Mary stripped naked...and went through the tuned-laser decontamination process, coherent beams at precise wave-lengths passing through her flesh to zap foreign molecules within her body. Already, similar devices were being built in Mary's world to treat many forms of infection. Sadly, though, since tumors were made of the patient's own cells, this process couldn't cure cancers, such as the leukemia that had taken Ponter's wife, Klast, two years ago...

The lasers danced over - and through - Mary's body until the square light above the door changed color, signaling that she should leave.

From Hybrids (Neanderthal Parallax), by Robert J. Sawyer.
Published by Tor in 2003
Additional resources -

Thanks to CyberStrike for contributing this item.

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Additional resources:
  More Ideas and Technology from Hybrids (Neanderthal Parallax)
  More Ideas and Technology by Robert J. Sawyer
  Tech news articles related to Hybrids (Neanderthal Parallax)
  Tech news articles related to works by Robert J. Sawyer

Tuned-Laser Decontamination-related news articles:
  - Raydiance USP Laser Attacks Unwanted Cells
  - Forced Resonance Ultra-Short Pulse Laser Kills Viruses Dead
  - Separate Parasites From Hosts - With Light
  - Plasma Flashlight Illuminates, Kills Bacteria

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