Invisible Ink Could Reveal Whether Kids Have Been Vaccinated

The general idea is nothing new. Quoting Heinlein's "Farmer in the Sky" (1950):

> We were busy with inoculations and blood typing and immunizations and I hardly got to school at all. When I wasn’t being stuck or being bled, I was sick with the last thing they had done to me. Finally we had to have our whole medical history tattooed on us—identity number, Rh factor, blood type, coag time, diseases you had had, natural immunities and inoculations. The girls and the women usually had it done in invisible ink that showed up only under infra-red light, or else they put it on the soles of their feet.

At that point why do we care about "invisible?" let's just go whole hog "idiocracy" and tattoo barcodes on people. Encode a central registry key for universal ID, and things of immediate use like blood type, sensitivities, birth class, genetic fitness score...

Probably D-DIMER test would be good too...