NHRA has observers at the national events looking for all kinds of stuff. Excessive braking, pulling off safety equipment before you got off the track, funny blinking lights, etc. They're on a schedule and don't want to have to clean up a mess or have people get hurt. Local tracks and divisionals, luck of the draw. I've seen flat tires and wrecked cars from it. Kind of stupid, but people still do it. Guys like the 4 caliper rear brake kits for that so they don't slide the front tires.