If you think about it, it's a shortcut for drawing blood and analyzing it to see what antibodies are in there. As long as the marker has zero PII, just what va

If you think about it, it's a shortcut for drawing blood and analyzing it to see what antibodies are in there. As long as the marker has zero PII, just what vaccine was given, this seems harmless enough and vastly more helpful than the current paper system. The potential for abuse is limited because you need to have the person in front of you, and then the only info is a vector of vaccine administered bits.