I think I see a problem with that.
https://nypost.com/2021/03/09/fda-approves-new-covid-19-test-that-could-help-long-haulers/
The blood test extracts DNA from T-cells and then uses machine-learning software developed in a partnership with Microsoft to determine if the person has been previously infected with the virus.
Either test will qualify you for an Immunity Passport as it includes the naturally immunized as well as the 'jab' infected / 'vaccinated'.