Actually, I'm torn on the issue. We sent a letter to the local (fairfax/reston) police about this situation last year. We told them that we would appreciate a police presence that was cooperative and there to prevent morons from ruining the experience for everyone but we DID NOT appreciate the fact that they harassed several drivers and used the event to pick out random rice violations.
I am torn on wether we should contact them again, because it may just alert them and they will again be a pain in the butt. It wasn't really that big of a problem last year, but it made a couple of us mad that they didn't help at all they were only there to fill their quotas.
You're still pissed registration sticker (or something) last year at the BBQ