Yes, it is possible to accurately detect antibodies with certain antibody tests (primarily, blood draws) administered by certain parties. But now you have a com

Yes, it is possible to accurately detect antibodies with certain antibody tests (primarily, blood draws) administered by certain parties. But now you have a complex patchwork of antibody test exception standards formulated and enforced to satisfy the preferences of a small number of individuals, most of whom simply object to vaccination on ideological grounds. These folks should just get vaccinated.