http://www.pbs.org/wgbh/masterpiece/
Well worth watching and can be seen on line at the web address provided.
Tagging in England one an experiment and the other identity inserted under skin.
Coding where you can go, cameras on you and death to anyone who did not fit. To be used as medical, credit card etc. similar
to the tags placed in our pets but more detailed and accessed by government.
The other tag was able to identity your genetic and world place, Medically you could be DNA identified by race, religion and nationality for chemical [i]annihilation[/i]. Tested to see if it could be accomplished.
The testing to see if other countries would be able to destroy populations by DNA serum detection.
When completed in the movie it allowed Britain to control their borders and lock down entry.
Science Fiction leads Science. Remember the water Bed in Stranger in a strange land.
The endless probability of any combinations of themes is staggering.
It would seem that corporate world would have the greatest use for tag. The tag could even have a fail safe scrubber in it to end a life not needed or considered a threat.