Only because there haven't been that many cases based on it. As it becomes more routine, we will discover - as we have with other lab results - that DNA tests

Only because there haven't been that many cases based on it. As it becomes more routine, we will discover - as we have with other lab results - that DNA tests have often been falsified, by lazy or incompetent or corrupt lab workers, and that those test results have sent thousands of people to prison - as is true with other sorts of lab tests, often drug tests, as Googling will plainly show you.