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"I prefer working by artificial light."
- Isaac Asimov

DNA Swab Palate  
  Adheres to the palate, and provides false material for DNA swabs.  

'And we need to record your visit,' she adds, producing a sample kit. 'As part of Devo action, we can take swabs.'

'Unless you want to donate a tooth,' the ranger says.

Shep's jaw twinges. But consequences aside, you can still prepare for being caught. He sets his teeth and tongues fifteen beats on the roof of his mouth. A silky film peels away from his palate and dissolves. His mouth fills with the brackish taste of artificial saliva. All he has to do now is hold the liquid in the gullies of his mouth without retching.

The clerk unpacks the tester kit. 'Say ahh,' she says. In goes the swab, woolen and tickling. She keeps his tongue wedged back, just like he's practiced. He looks at the vial, slime on glass, and knows there's no way they'll identify him.

From The Breach, by M.T. Hill.
Published by Titan Books in 2020
Additional resources -

Compare to the dispensing tooth in Dune (1965) by Frank Herbert.

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