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Originally posted by NuclearPaul
I don't know if they would need to actually store much information on it at all. Just a number, which brings up your file on an enormous database would do the trick.
U.S. Patent No. 5,878,155 and granted in March, 1999 -- "describes how people can be identified for eCommerce transactions by invisible barcodes tattooed on their skin." The patent identifies invisible tattoo ink that is currently available commercially, according to the Compaq report.