Google and Apple are updating their COVID-19 Exposure Notification system to support US states that have yet to develop their own Exposure Notification app. While the initial release of Exposure Notifications required countries or states to release their own app supporting the system, the new Exposure Notifications Express removes that requirement. States must still opt in to the system, but once they do, most iOS and Android phones in that state will receive a push notification inviting them to opt in to the system. On iOS, opting in will activate the new Exposure Notifications Express feature built in to the just-released iOS 13.7. Android users opting in will be prompted to download an app from Google to enable the feature. As with all variants of Exposure Notifications, privacy is protected since personal-identifying and location data is neither collected nor sent to states. Instead, randomly-generated ID numbers are exchanged with nearby phones via short-range Bluetooth, to keep track of which phones are near which other phones, and for how long. When someone enrolled in the system self-reports that they have tested positive for COVID-19, others enrolled in the system that have been near that person are notified, so they can seek testing. Maryland, Nevada, Virginia, and Washington, D.C. have already announced that they will participate, while six states have already released their own apps to enable Exposure Notifications