[markwkw]

There is little hope for stopping cheaters.

example: Moon Ribas, an artist, has a small vibrating sensor embedded permanently in her feet that communicates wirelessly and vibrates whenever there is an earthquake somewhere in the world. https://en.wikipedia.org/wiki/Moon_Ribas#Seismic_Sense

The idea can be extended to an implanted device that receives subtle signals from the user to have a representation of the game state and communicates back through gentle sensations.

[Underqualified]

They are now using a 15 minute delay to avoid outside communication. Jamming signals is also entirely possible.

[rozab]

The method in this article uses no outside communication or signalling at all

[Underqualified]

But the Moon Ribas example requires outside communication, I'm just saying that it seems possible to prevent using that effectively.

As for electronics, I assume most can be detected ? Maybe implants might pose a problem ?