A soldier of the Swiss army wearing a protective face mask holds a smartphone with an app using Decentralized Privacy-Preserving Proximity Tracing (DP-3T) during a test with 100 soldiers in the military compound of Chamblon near Yverdon-les-Bains, Switzerland, Thursday, April 30, 2020. The race by governments to develop mobile tracing apps in order to contain infections after lockdowns ease is focusing attention on privacy. The debate is especially urgent in Europe, where academics and civil liberties activists are pushing for solutions that protect personal data. (Laurent Gillieron/Keystone via AP)
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