I am a retired federal employee for US Customs. I propose the US government/or States issue color coded badges green for negative, yellow for negative but once positive and red for positive for the Covid-19 virus. The badges could be updated using technology every two weeks for additional testing until a vaccine is found. Only Americans with green or yellow badges would be allowed to work, travel by mass transit, bus, boat (cruises), or plane, and attend University and people with red badges would be quarantined. I also propose using thermometers/scanners at offices, mass transit, and shopping areas to identify people with fevers who should be tested and badges revised accordingly. I believe this is a cost-effective way to allow Americans to go back to work. Also, it would not infringe on privacy as would tracking cell phones. In addition, this would reduce costs for contact tracing, as people with badges would be immediately eliminated. This methodology could also be used in third world countries as it is low cost.