PCR test conspiracies drive me mad! There's a document that says the tests don't detect an infectious virus and some CTs use it to "prove" that the PCR test can't be used for telling people to isolate since it doesn't detect an infectious virus, but what that means basically is that although the test can detect whatever it's been set to look for, it can't tell if that person is infectious or not. However we KNOW covid-19 is infectious so it stands to reason that if the virus is present then that person is infectious. People just read the bits they want to or that support their narrative and don't bother to fully research or understand.
In partial defence of this idea - there have been some suggestions that a PCR test could still pick up the RNA of the virus after you've already stopped having symptoms and it is no longer "active" in your body.