To end social distancing, the U.S. must dramatically ramp up contact tracing

How open will Americans be to having their movements tracked?

TraceTogether app

TraceTogether, an app used in Singapore, uses Bluetooth signals to log when two phones with the app are close for a certain period of time. That allows public health officials to alert people who have come into contact with someone with COVID-19, and urge them to self-isolate and prevent further disease spread.

CATHERINE LAI/AFP/Getty Images

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