Too many edge cases, what if you're just there to pay a parking fine? I think good old device encryption is the way to go. Only a warrant can make you provide

Too many edge cases, what if you're just there to pay a parking fine? I think good old device encryption is the way to go. Only a warrant can make you provide the password for them to access your phone, and even then you could withhold it for whatever reason (though not without consequence).