What I do is reboot my iPhone before approaching immigration control in any country. And when it powers up, I deliberately do not put in my passcode. Even though I have enabled Touch ID, that feature is by default disabled until I first put in my passcode. The US courts are clear that law enforcement cannot demand your password. Traditionally, in the United States, you cannot be compelled to give testimonial evidence; however, you can be compelled to turn over a physical key to a safe. As such, a court can compel you to provide your fingerprints to unlock the device.4 Simple solution: reboot
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