Could biometric access be lost?¶

Yes. Biometric access may stop being available after certain events, leaving only the passcode or password.

Evidential caution: that a phone unlocked by fingerprint or face can always be reopened the same way.

What this means¶

Restart, power loss, security timeout, repeated failed attempts, remote lock or some system events may require the full passcode.

A phone that is currently accessible may therefore present a temporary live state.

Biometric sensors may also stop working because of damage, moisture, gloves, masks or changes in the user’s condition.

Where the phone is evidentially significant, seek specialist advice quickly.

What to check or do next¶

• Record whether the device is unlocked, what is visible, the battery level and any security prompt.
• Do not restart the phone, press buttons unnecessarily or allow avoidable power loss.
• Do not repeatedly attempt biometric access. Failed attempts may reduce the remaining opportunity or trigger stronger security controls.
• Record whether the device was being kept awake and whether any action caused the screen to lock.
• If biometric access is lost during handling, record when and how the state changed.
• Do not ask several people to try fingerprints or faces. That risks lockout and weakens the continuity of the handling record. Preserve any visible warning that biometric access has been disabled or that the passcode is now required.

Evidential limits¶

The availability of biometric access does not create authority to search the phone. Preservation, lawful access and examination remain separate decisions.