LiveScience.com reports that a company called Somark Innovations is making RFID (Radio Frequency Identification) ink for cattle. The tattoos can be colored or invisible.
What's cool is this technology in the future could be used on troops to keep track of them on the battle field. For instance, it could be used to rescue soldiers and prevent friendly fire.
What a rich high-profile person could do is when they have a child that is born is to put this on the child. That way if the child is kidnaped the police would be able to locate the child easier. This technology could be put on prisoners just in case they escape but if a person can wash the ink off (the article does not say) that would not be of much help.
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