According to this piece from Newsday, the PBA has gone on record about a union policy that discourages cops from ticketing other cops. They call it a "professional courtesy."
How nice... What other professional courtesies should government employees extend one another? Should tax assessors give one another leeway in assessing one another's property values?
It's about time we let those that enforce the laws know that they're not members of some sort of privileged ruling class in our society. While we all know that local politics and administration tends to be a game of "you scratch my back, I'll scratch yours" more often than not, we can't give any legitimacy to something that flies in the face of equal protection under the law or preferential treatment.