Stupid idea in the US
For left pondians...
The lawman believes and the courts agree that you have no reasonable expectation of privacy concerning your appearance or fingerprints, as you leave those exposed in public all the time. So you can be compelled to unlock with your mug or prints. I assume this means they can use your photo - its not that much of a legal stretch in an already elastic system.
A PIN on the other hand is stored in your brain, so they need your permission or a court order. YMMV, and I've no clue what the rules are for right pondians.
Now, contemplate the smudge pattern your PIN entry has left on your display and think about a new PIN...
Biting the hand that feeds IT
