Rather than rolling out whatever Apple and Google cook up nationally, we should try rival approaches regionally in the United States and assess. The published design bakes in lots of assumptions about disease spread and is not auditable. Also assumes location data is dispensable
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Without technology, contact tracing is at best humans running down educated guesses of where a contagious person has been. Leveraging prox-based data will only help make that more complete.
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FWIW, it does seem so. Narrowing in on Bluetooth was one of the main conclusions from the https://www.pepp-pt.org research with epidemiologists. The bounding grid formed by location turns out to be quite big and error-prone. BLE much more localized.
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Better link: https://docs.google.com/document/d/16Kh4_Q_tmyRh0-v452wiul9oQAiTRj8AdZ5vcOJum9Y/edit … . GPS and cell tower data can be off, e.g. around tall buildings and would generate a lot of matches who you're not that close to. Of course disclosing location for tracing history is a seperate argument than whether its suitable for matches.
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