For those who test positive, you combine it with a

For those who test positive, you combine it with a PCR test to verify lack of current infection. If it currently infected, then you have antibodies and were already infected and now have immunity for 3-4 months, assumed based on current data.

You could then tie the test to a tracking mechanism to allow the results to be shared when visiting places or attending events. Hmm! Where have we heard this idea before.