I have posted lots of links to test data and articles. Look through my history and you will find a number of sources referring to the high level of false negatives. It has been been called useful for being a red light but less so as a green light. It's all about the message folks receive. A negative test means there is a ~50% chance you don't have the 'rona. A positive test is pretty certain. Small degree of false positives. But false positives just inconvenience people. A false negative mislead folks into thinking it is safe to ignore pandemic precautions.