Handy overview of various anti-counterfeiting technologies and where they're primarily used at, such as Holograms, Optically variable inks, Microlenticular technology, Special inks, Nanomarkers, and yes, RFID tags, but keep in mind that they used to be "covert" decades ago, but in the passports of some nowadays.You might find a previous post "Pass the Scissors" worth reading as well.
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