I was concerned with recording in public. what am I allowed to record? What if an officer approaches me? What if I am being pulled over, may I record it? May I record police arresting someone else, my own arrest?
The law allows one to record as long as you are not infringing on another's privacy. Typically, recording anything in the public view is acceptable. Aside from whether it is legal to do so, the police may not appreciate you recording their actions. I have had clients who were threatened by police officers for engaging in this type of behavior. Your actions cannot hamper the officers investigation or arrest of you either. You could theoretically be charged with Obstruction Justice if your recording action somehow prevents the police from doing their job. Your actions cannot cause problems either. An example would be someone who stops a car on a busy stretch of highway to video tape the arrest of another citizen.
Anything done in public is not protected by privacy laws. Recording is legal so long as you do not violate other laws.