Due to existing biometric technology, there will be no need for a "mark"... you are born with unique biological identifiers in your fingerprints, retinas, DNA, etc. Once that data is added to a database matching it to your identity, you will have the "mark" by default... unless you have never been fingerprinted, etc. and refuse to do so if asked. They now have retina scan machines to go through Customs at some international checkpoints... eventually it will be all of them and rather than a convenience, it will someday be required to enter or leave a country.
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