Well I live in a big city, cops act first think later. If I am flying in a park legally and some busy body thinks its illegal and calls the cops chances are A - he wont know the laws, and B- if he is douchy, like they are in my town just demand things like hand over the drone. I am not going to argue with someone like that. I don't want to deal with court dates or fines to prove I am operating within the law. A week later it could be a different officer completely oblivious to what happened. With hundreds of cops, I doubt they are spreading about some tiny incident. Cop always wins.
I think I am leaning to register my drone even though it's under the 249g limit. Is there really any down side to it? Maybe that should be another thread.