The do look for random segments of the virus. I assume anyone producing spike protein would test positive. Half life of mRNA is 8-10 days depending on who you listen to.
Giant BS circle jerk.
The real problem here is that despite misleading claims made by the manufacturers to protect their bottom lines... the vaccines are losing their effectiveness against a quickly evolving set of viruses. Pfizer is the most effective and it is now less than 40% effective against the “Delta variant” and dropping fast.
The primary reason people who have had the virus are getting sick again with Covid is because one of the most commonly used PCR test is currently having its emergency use authorization pulled largely because it has up to a 90% false positive rate. Millions of people who were told they had Covid had the flu or some other illness, none of them have actual immunity to Covid.
Not making the news from the MSM is that one of the most commonly used antibody tests also had its emergency use authorization pulled because it was not detecting antibodies in a large percentage of people who actually had developed antibodies.
Not that other tests for Covid or Covid antibodies are a whole lot better. They are not. The hysteria over this has been driven largely by the misuse of test result statistics. These tests were meant to be used by doctors as diagnostic tools not to be used to come up with fake statistics for scare mongers.
The recent “variants” are more contagious but much less dangerous... less dangerous than a typical flu. They are in reality a godsend because they will grant immunity that is much more effective than the “vaccines” provide with very little risk to people who are not already at great risk of dying from any type of pathogen that they pick up. Actual herd immunity will be achieved quickly and this entire politically motivated fiasco will lose its usefulness to leftists trying to destroy our economy and everything that we stand for.