I am still not sold for NY. If you commute daily with the metro and test positive, even going back only one week, you are going to trigger hundreds of previous

I am still not sold for NY. If you commute daily with the metro and test positive, even going back only one week, you are going to trigger hundreds of previous contacts (people in the same car in the train, on the platform, people you crossed walking in a tunnel, etc). Basically the average new yorker may end up having to get tested several times a week. I think it makes more sense when the density of contacts is less extreme.