When your photo is taken for your driver's license, why do they tell you to smile?

True story, one time when I was pulled over by the cops for speeding, they looked at my license and kept looking at me, and were talking with each other for like 2 minutes and saying "do you think that's him"?

And to answer your question, no I wasn't smiling.
 
good point
maybe because we should smile in advance because we will not be able to smile in this situation.
 
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