This is not just theory though. One of the many RNA sequences that have been suggested by WHO actually exists in human DNA. That literally means that you can get a positive PCR "virus"
... match because you have human DNA in your lung fluid (which you definitely will have of course). Matters are however complicated, and not all tests will be matches, because of the
nature of the test. This has to do with the fact that it is not so clean cut that it matches everything perfectly with no "amplification".
