Restraining order! That way it is on record and he is not allowed near your property or the neighbor! Its that simple!!!! Then id he violates the order HE has to answer to the cops. Also inform the police chief of the other cops actions and file a complaint on him. I live in a small town and rumors are very effective. Yes, there can be some trouble from the cop or his friends but that is a very minor possibility! The law is for ALL of us!!
Good luck and God Bless!
Good luck and God Bless!