[dustball156]

> The question is whether you can get that without a huge false positive rate. My guess is that you can

No, you can't. The virus spreads exponentially and the app is suppose to keep up. In other words, you get an exponential number of alarms.

> On the cost issue, the obvious solution is to make testing free and easy

Cost is not the limiting factor. Equipment, reagents and time is. We could have easily beaten the pandemic by now if simply going from door to door and taking a smear test was an option.

[ilogik]

the whole point of the app is to isolate people that have been in contact with positive cases before they become contagious.

if everyone has the app, you won't have an exponential growth.

https://www.youtube.com/watch?v=gxAaO2rsdIs