[0xBeefFed]

If you have a Bluetooth receiver logging the different IDs you've come in proximity with and when, its easy to deduce who the positive user is by who you were in proximity of at that time.

[burke]

This is why the Framework only reports matches with a very coarse granularity.

[closeparen]

At what time? It could be any user you’ve been in contact with for two weeks.