While countries like the UK insist that such documents are simply used to keep a record of vaccinations and remind people when they need to receive a second dose of the drug, Privacy International detailed how the seemingly benign cards, which on their face appear “necessary,” could evolve into something quite different.

The group said that if vaccines ever become a requirement, or are used to grant certain privileges, there becomes a need to “verify” any related documents, essentially turning the card into a “pass.” 



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