In the US I think it is by each state not federal/countrywide. * https://9to5mac.com/2020/05/21/covid-19-exposure-notification-api-states/ https://9to5mac.com/

In the US I think it is by each state not federal/countrywide. * https://9to5mac.com/2020/05/21/covid-19-exposure-notification-api-states/ https://9to5mac.com/2020/05/21/covid-19-exposure-notificatio... * https://www.wired.com/story/covid-19-contact-tracing-app-fragmentation/ https://www.wired.com/story/covid-19-contact-tracing-app-fra...