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This sounds bad. We are already forced to use almost exact voice to give voice commands. Now we will be forced to walk the same, speak every so even if you are alone in the room and be sure we dont break our habits. For me this sounds bad. I will be waiting for Google to prove me I am mistaken.

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If you combined this with multifactor authentication (e.g. fallback to a password for a 100% trust score), it could potentially match your change in biometrics against a diagnostics knowledge base and use any new data following to further train the diagnostics knowledge base. Of course, that would have to be opt-in with patient confidentiality as strongly defended as possible (there needs to be laws and regulations defending privacy with this model), but it would be an interesting source of data collection.

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