The following material from Brownstone details the main objections to the PCR test for Covid. The core issue seems to be methodological in nature, namely that the mere presence of DNA in a patient is no more proof of a disease being caused by the virus having that DNA than the presence of DNA at a crime scene is proof of the identity of some alleged crime being committed. Even the inventor of PCR, Kary Mullis, who won the Nobel Prize in Chemistry in 1993, vehemently opposed using PCR to diagnose diseases: “PCR is a process that’s used to make a whole lot of something out of something. It allows you to take a very miniscule amount of anything and make it measurable and then talk about it like it’s important.” “PCR tests are quick and extremely sensitive, but their very sensitivity makes false positives likely” reported the New York Times, “and when hundreds or thousands of people are tested, as occurred at Dartmouth, false positives can make it seem like there is an epidemic.”
https://brownstone.org/articles/pcr-tests-and-the-rise-of-disease-panic/