Flipping off police officers is definitely legal, if not advisable
Finally, justice has come to this great land. Never before has the national anthem sounded so sweet in our ears. It is now legal, according to the U.S. Court of appeals, to flip off a police officer. Your middle finger can stand as strong and proud as the Statue of Liberty out your car window at a police officer and they cannot pull you over or arrest you. It is legal, citizens, according to the 14-page finding from the court that says the "ancient gesture of insult is not the basis for a reasonable suspicion of a traffic violation or impending criminal activity." [Source]