When I went to get my CCW, my daughter came to the police station with me. It just naturally evolved into her getting printed also (she was seven years old at the time). I don't know what the cop thought, he was cool with it though, and I kept the sheet.
I think it's like taking photographs every so often as they grow up. Nobody wants anything bad to happen but if it does you have some sort of identifying stuff. Like dental records.
I just had a horrible shiver run down my spine. eeeeuwww, bad, bad, bad.