Bluetooth beaconing can estimate the distance between two devices (and does better if, eg, given 10 seconds to estimate vs. 1 second). I assume a covid-19 cont

Bluetooth beaconing can estimate the distance between two devices (and does better if, eg, given 10 seconds to estimate vs. 1 second). I assume a covid-19 contact tracing system would use this, among other things, to filter out contacts that don’t meet the established criteria for high enough risk of transmission.