[vidarh]

The problem with that is that even "essentially no risk of false positives" starts adding up when you do millions of tests every year.

If those tests are done on demographics where the chance of a true positive is also very low and the difference in risk profile between catching it during such screening vs. waiting until the patient discovers it is not very significant, it can take a very low rate of complications before it becomes a problem.

But, yes, we do limit that, and that is a major reason there are very few mass screening programs.