I believe my statements were that I believed that the test may have a high sensitivity, but a low specificity. In other words, this coronavirus shares similarities to other coronaviruses. When you are amplifying the product you are to have it show up in a level that the test can safely detect, then you are also amplifying things that can interfere and cause a false positive. The more you amplify, the more you need to be able to weed out and exclude things that are close but not the actual part you are looking for.
PCR testing also requires some very close attention to procedures that prevent any kind of cross contamination and cleaning. If you have a positive sample and clean room procedures break down, you can have cross contamination in future tests. I worked for 3 years in the lab at the University of Utah where all the organ and bone marrow transplant testing is done. Some tests are done on a DNA level and there are a lot of steps along the way that can effect results. Now with this PCR coronavirus, I am sure that it is an automated process unlike the manual processes we did, but just because it is automated, it does not eliminate human errors.
Tests like these usually take years to develop and refine and this one came to market in the mater of a few months.