Driver license picture?

A traffic cop stopped a woman for a minor traffic violation.
After examining her driver’s license in silence for a
moment, he said, “You know something? This is one of the
finest, most realistic pictures I’ve ever seen. I’m glad to
see you aren’t one of those vain women who have their photos
retouched to remove all the lines in their face.”

“Sir,” she replied icily, “you are looking at my
thumb-print.”