N Cook wrote:

I don't see how they can be used for the purposes of identity.
Say the sub-cutaneous implants for pedigree dogs.
All you do is pass a scanner near the dog, obtain the code, buy a
blank slug for a few cents/dollars , clone that one, and plant in your
phoney dog or dogs. Then which is the genuine one?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

They have a predefined identity code built in.

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Regards:
Baron.