In the Brazilian voting machine this is often done. You type the numbers and it loads the candidate info in the screen. Once you click [Confirm] the screen gets

In the Brazilian voting machine this is often done. You type the numbers and it loads the candidate info in the screen. Once you click [Confirm] the screen gets blank with the message of success. Therefore the only way to take a picture is before the vote is actually processed. You have a [Reset] button to re-enter the numbers.