FOP stickers and, as Bob mentioned, the Thin Blue Line Stickers, hold no weight with me. I will execute a TS on anyone regardless of an FOB/TBL sticker, and for the record, I would stop vehicles with S&C plates/decals too. My decision on whether or not to issue a traffic citation has to do with the severity of the offense, the totality of the encounter with the driver, and not whatever they have on the back of their car. Nothing frustrates me more than people who think they are ENTITLED to a break.
"Hey, I'm sorry. I'm on the job in Some City, I should have been more careful." is one way to tell me you're a cop (and you better had an ID to back it up, because fake cops go straight to jail), but that doesn't mean you're getting a break. You go 48 in a school zone, and you're getting a ticket, period, cop or no cop. Basically, as a police officer, you have discretion in issuing the traffic citation. If I wouldn't consider giving a civilian a verbal/written warning for the same offense, a brother cop isn't going to get the consideration either. There is no such thing as a free pass in my book. I've been on stops where they are sticking a badge in my face before I even get to open my mouth. <shakes head>.