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The major cause with false negatives is that people don't swab correctly.
It’s certainly an issue with the dichotomous lateral flow tests which only read out yay or nay, and don’t indicate if a swab was sufficiently swabbed (eg, by testing for the presence of a related enzyme). The study I’m thinking of was done in Canada on samples taken at a regional hospital, iirc. That’s not to discount human error entirely, but the likelihood is lower. It’s not the only study indicating that available testing methods aren’t unerring (NY did a massive study but I don’t recall if it was for PCR tests).
Eseman
The major cause with false negatives is that people don't swab correctly.
But that is neither here nor there stay safe old person snigger.
EDIT:snogger is auto corrected to snigger.