This is the biggest issue I have with them. The only way this will work in modern society where the police can’t be trusted, is if the ID is accessible while the rest of the device is locked down.
And that’s really only possible if Apple and Google integrate that directly into the OS.
App Pinning DOES NOT lockdown the device, even if you have it set to require a PIN to unpin, biometrics still work to unlock the device.
It also gives you a warning that personal data may still be accessible and the pinned app can open other apps. It specifically says “Only use app pinning with people you trust”… which is the exact opposite of the use case here. And app pinning is turned off by default, you have go go searching in the settings to enable the ability.