FILE PHOTO: A Swiss soldier shows on a mobile device the contact tracking application created by the Swiss Federal Institute of Technology Lausanne (EPFL), using Bluetooth and a design called Decentralised Privacy-Preserving Proximity Tracing (DP-3T), which will be launched on May 11 by the Swiss Government for easing of the lockdown caused by the coronavirus disease (COVID-19) outbreak, at the Chamblon barracks, Switzerland April 30, 2020. REUTERS/Denis Balibouse/File Photo