So, I did two tests today, at lunchtime.
I used the free one from CDC, made in China, of course. Tested negative.
I used the not free one from Abbott, made in the USA, of course. Tested positive.
Moral:
Had I used the one from China and only China, I'd probably be out right now getting someone sick.
Makes you wonder if this is negative on purpose, to keep the spread going in the USA.