Do you think the false positives are per-recording? In that case, you could just do a few more test coughs with the same person to double check, and get that fa

Do you think the false positives are per-recording? In that case, you could just do a few more test coughs with the same person to double check, and get that false negative rate down. If false positives are per-person, then your scenario won't happen. It'll be the same 6 kids for whom the test never works right. So with all this in mind, you'll have to come up with appropriate norms around the results. You could call it "okay" vs "suspect" instead of negative and positive. Maybe there's a lowered-risk version of activities for people who are "suspect" that day. Maybe they don't go to the gym that day, maybe they sit in the isolated booth in the classroom, whatever. But then, they need to take a standard test that night to return to school the next day. Or as someone else mentioned, a rapid-test at the nurse's office.