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I wonder about the training of the test-givers. They've hired so many new people to do it, I don't think the requirements for hire are very high (probably a month of training). I'm sure sometimes it's nurses, or there's a nurse nearby, but it takes a while to really get the idea of how the nasal anatomy works in different people and not everyone's nose is the same. Needs to be enough swabbing, not just a little.
In Virginia the test are administered by licenses medical personnel, per Board of Pharmacy and Medicine regulations. (LOL, Virginia is know for requiring a license for everything and a nice fee for the state coffers.)
Virginia used the NG medical core to assist with NHs, many companies provide testing for businesses many of these are self administered, CVS is self administered. I'm not confident in the reliability of self administered. Not sure I could stick a swab up my nose and do a good job.
I think the test with medical professionals would be more accurate. A large food manufacturer in my town had a large outbreak. They use a company with self administered to test 400 employees. Many of the employees did not reach deep into the nasal cavity with the nasal swab, resulting in only a few positives. Over the next week, many became symptomatic and tested postive at the doctors office.