Legal wonks: I know biometric identification isn't afforded the same protection by law on the basis that biometrics are public (e.g. fingerprints are left ever

Legal wonks: I know biometric identification isn't afforded the same protection by law on the basis that biometrics are public (e.g. fingerprints are left everywhere), but what about physical keys? FIDO2 is entirely analogous to a physical key, and it's not exactly public the way biomtrics are. I'd still prefer a password for that added 5th amendment layer of protection, but I'm looking for what legal minds think about this right now.