Why Bluetooth apps are bad at discovering new cases of COVID-19

Illustration by Grayson Blackmon and Alex Castro / The Verge Yesterday, we talked about the things that need to happen before we can begin to slowly re-open our cities: hospital bed supply catches up fully with demand; testing catches up fully with demand; we develop programs for quarantining new cases and informing their contacts that they may have been exposed to the disease; and the number of cases declines for 14 consecutive days.
Today let’s zoom in (not Zoom in) on the third point: