Interesting situation: passenger travels to Kauai through the pre travel testing program with a negative test. She volunteers for the islands post-arrival test 3 days later and
is negative. But she develops symptoms of COVID anyway, finally getting a positive result.

https://www.staradvertiser.com/2020/10/28/breaking-news/kauai-visitor-tests-positive-for-covid-19-after-twice-testing-negative/ Negative Passenger is Really Positive