word choice - Respectful way to say "policeman"

Let's say I want to call a policeman, or I am in a n-person conversation involving a policeman and I want a word to refer to the policeman. And let's say I want a respectful word.

I believe おまわりさん could sound a bit insulting (low rank).
Should I say 警察さん?

Is there a more respectful way to call a policeman, who actually might be an officer?