A contact tracing mobile app the Australian government plans to introduce to help reduce the spread of COVID-19 has the potential to provide critical information. But it also raises concerns. Fulton Schools Professor Katina Michael and a colleague at the University of Wollongong in Australia describe the proposed TraceTogether app that will use Bluetooth technology to sense whether users who have voluntarily opted-in have come within nine meters of one another. The surveillance could help respond to the coronavirus crisis by proactively placing confirmed and suspected cases in quarantine. The downside is that it could lead to infringement on users’ privacy and civil liberties.