So THAT'S Why You Can't Smile In Your Passport Photo
Briefly

"The main reason for banning smiling is the introduction of facial recognition software at airports and other border control checkpoints. Algorithms don't work as we do; they need to pinpoint and measure the user's facial features."
"An applicant actually can smile in their passport photo, as long as both of their eyes are open and their mouth is closed in the photo... it's a matter of border security."
Read at BuzzFeed
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