(Dr. Joseph Mercola) Digital vaccine passports have not been issued on a federal level in the U.S., but they’re widely available, nonetheless. At least 21 states, along with the District of Columbia and Puerto Rico, have rolled out digital vaccine passports, and four more states plan to release them soon. Advertised as a convenient way to store your health records, digital “passports” are poised to become much more than a way to display your COVID-19 shot status.