It's true that there are other options. However, in the real world that might not help, because sometimes the erroneous circumstances which cause the test to be

It's true that there are other options. However, in the real world that might not help, because sometimes the erroneous circumstances which cause the test to be inaccurate will continue to persist. For example, genetic parental tests are very accurate... unless the parent being tested has chimerism, in which case you'll get the very confusing result that the child isn't your own, even under repeated testing.