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Seems better than what I came up with, but one of my issues with Bluetooth is: how would you determine distance? Power?

Also: that central server has got to be pretty powerful.

Yeah I don't want to be commanded to self-isolate because I was 25 feet away from a stranger in a park...

Oh, I definitely do. That's a huge improvement over the current status quo where I contracted COVID-19 from passing a stranger in a park, have no idea I've done so because I thought that I was doing a good job of self isolation and never even saw that person, and two weeks later I'm wildly ill and have already infected everyone in my household.

More information gives me more tools to protect myself and those I love.

I wonder if they could reduce the power to the Bluetooth chipset to artificially reduce the range?

Might be possible with iOS devices as it's pretty easy to test each of them. Harder to do with the 1000s of Android devices that exist.

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