Somewhere in the infrared range of the electromagnetic spectrum there are terrahertz waves that can penetrate human bodies and react differently to different chemicals. We have large lab devices to make these. We may soon have small ones. Possibilities!
Repeat: there is serious talk of a handheld, non-contact device that can analyse the inside of a human.
*A tricorder is a gizmo from Star Trek. It is a handheld device that can analyse things without opening or even touching them.
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