One thing we think people do not understand about being exposed to COVID-19 and testing is that a negative test does not mean you leave quarantine early.
For example. You get called by contact tracers or just know someone you spent some time with tested positive for COVID-19. According to the CDC, you are to stay in quarantine for 14 days from your last contact with the person who has COVID-19.
When you are told of the exposure, you feel fine, and go get tested. It comes back negative.
That negative test does not mean you leave quarantine.