Adults are screened for anything? When does this happen? (Asked in a joke-like manor, but I am being serious, I can't recall EVER having been screened and don

Adults are screened for anything? When does this happen? (Asked in a joke-like manor, but I am being serious, I can't recall EVER having been screened and don't feel like I'm an outlying case. How many haven't been forced to be tested?)