well, it was clearly already circulating in hawaii quite a while anyway (the japanese tourist is documented and presumably there are other vectors).
When I lived on Guam, I used to go SCUBA diving in a remote restricted area called NAVFAC. It was crazy how many sharks there were. All of our dives were at night, and we swam out a hundred yards or so on our backs before descending. One time, we had a new guy with us, and half way out, he rolled over, turned on his light and started yelling “shark!”. We told him, “turn off your light and don’t look down”.
Testing for COVID-19 is the same. No testing, no sharks. I don’t know if there are any infections in Hawaii. Neither does Hawaii Department of Health.