I've heard of digital angel (this is old news, conspiracy theorists everywhere have been yapping about it for years), and the technology is there (they already use it in pets), but I don't buy the 666 or needing it for commerce thing, and an article I read on it stated it was specifically being marketed and used for tracking pets, and was not intended for human use. I did read about limited, voluntary use in humans (there was a club in Europe somewhere that gave discounts or special offers to people who had one), but it never really caught on.
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