Apple recently added a new passcode requirement rule for iPhones with Touch ID enabled,
according to MacWorld. The new rule requires a user to enter a passcode when an iPhone or iPad has met two conditions: the device has not been unlocked via a passcode for six days and has not been unlocked with Touch ID for the past eight hours.
The previous five passcode requirements are: the device has been turned on or restarted, the device has not been unlocked for 48 hours, the device has received a remote lock command from Find My iPhone, five unsuccessful Touch ID attempts and adding new fingers to Touch ID.
It's unclear why Apple added the restriction and why it chose an eight-hour window, but the rule comes after a judge
granted a search warrant forcing a woman to unlock her iPhone with Touch ID. The decision comes as some believe the biometric nature of Touch ID isn't protected by the Fifth Amendment's protection against self-incrimination. Passcodes, however, are considered protected individual privacies.
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Apple Secretly Adds New Passcode Requirement for Touch ID