I've been pulled over twice- once in high school and once in college. Both times I've been given a warning. In high school, the cop didn't really say much to me, and I just got pulled over for briefly stopping at the STOP sign at the end of my neighborhood. He made me late to school though!
Last year though I got pulled over driving home for spring break. I have my letters on my back windshield. It was around 11 on a Friday morning and the cop pulled me over for doing 82 in a 65. Then he asked if I was drinking. Who the hell makes a 3 1/2 hour drive home DRUNK on a Friday MORNING?! I don't know if it had to do with my letters on my car or not. And I still only got the warning.