The app itself recommends only showing the officer your screen, and not handing your phone over. As for Android, you can also pin the app before handing it over

The app itself recommends only showing the officer your screen, and not handing your phone over. As for Android, you can also pin the app before handing it over, if you so wish to. Pinning is a feature whereby the foreground app is the only app that can be interacted with until the next time you unlock the phone. All notifications are also hidden.