“Contact tracing” is a public health measure used to control disease spread. Trained public health workers assist patients with an infectious disease recall their close contacts within a given timeframe, notify them of potential exposure, and provide advice to patients and contacts. Given the scale of the COVID-19 pandemic, some public health authorities areautomating part of the tracing process with smartphone applications (apps). Some apps take advantage of Bluetooth signals to track individuals proximity to one another, otherwise known as “digital exposure notification (DEN)” Bluetooth allows short-range wireless communications between electronic devices. Apps may also be used by public health authorities to enable “digital contact tracing” (DCT), which may also use location data.