I've never been big on personalized plates but last year I bought two specialized plates with 'Support Firefighters' on them. I'm not enough of a hypocrite to get anything that says 'Support Cops' but firefighters are cool and I accomplish the same thing. I have already on two occasions seen a cop whip out behind me ready to give chase and then immediately turn off after getting close enough to see my tag. Cops don't want to fuck with firefighters. Every little bit of advantage I can give myself is worth it.