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California and Canada are both reporting that 10% of testing kits don't seem to work. Maybe that's it.
However some research seems to show (in China, South Korea, Japan) that the same person can test positive one day, then negative a few days later, then positive again. No studies of how often that happens. But it would certainly cause people using tests in the field to wonder about accuracy.
A study seemed to show that samples taken from up inside the nose did not have this issue - it was throat samples, IIRC.
We definitely need two kinds of global testing (active cases and antibody cases) and then of course, the waiting game to see if people remain immune.
This will take more resources than we can possibly imagine right now.
this is why I'm still worried about my Dad
he tested negative but I don't trust the results