Never even consider pulling over a marked cruiser. As stated, you have no idea where they are going or what they are going to. You do not want the reputation as the area a$$hole by the cops that could save your life. Personally, I do not ticket LEO's, plain and simple. There are some situations that the Commonwealth of Virginia mandates that I arrest if PC exists and if a police officer happened to be the suspect, then so be it. I do not have discretion in those situations, but that is it.
Pittsburgh Pirates- 1st place NL Central 7/15/11
They've got us surrounded? Good. Now we can fire in any direction, those bastards wont get away this time
An amateur will train until they get it right. A professional will train until they can't get it wrong.