It’s a study. A completely harmless, simple study that does not preclude anything else and shows positive results. What is your complaint? That it isn’t 100% de

It’s a study. A completely harmless, simple study that does not preclude anything else and shows positive results. What is your complaint? That it isn’t 100% definitive in all cases? That something else is better? That’s not the way progress is made. Something that detects 10% of cases and is completely free (using a device people are wearing anyway) is valuable. You can be sure that some of these cases would have been missed by all the other tests, simply because not every one of these cases got any test at all.