narf
Sgt. Maj. Buzzkill
"If you had it" is anti_body_ tests.I am thinking about the antigen rapid tests.
Those are usefull to tell if you had it, not if you are at risk of giving it to others.
Antigen rapid tests can tell if you have it right now and are infectious, though not quite as sensitive as the full-scale in-lab PCR tests that take hours. They're cheap (3-5€ to purchase for self-administering, or currently free once per day in .de administered by a testing site, pharmacy, etc.)