That's what it is now.  There has been a number of media references to use of cell-phone location for this purpose. https://www.sciencemag.org/news/2020/03/cellphone-tracking-could-help-stem-spread-coronavirus-privacy-price https://www.rawstory.com/2020/03/coronavirus-cell-phone-tracking-analysis-shows-where-florida-spring-breakers-traveled-to-next/ https://www.washingtonpost.com/technology/2020/03/24/social-distancing-maps-cellphone-location/ https://www.dailymail.co.uk/news/article-8164301/Government-tracking-Americans-cell-phones-spread-coronavirus.html https://www.cnet.com/news/israel-is-tracking-phone-location-data-to-fight-covid-19-reports-say/ https://theconservativetreehouse.com/2020/03/27/l-a-mayor-eric-garcetti-admits-using-cell-phone-tracking-to-monitor-coronavirus-compliance/ Geesh.