Something I would add to the OP: Find out what time your local LE agency changes shifts. If your non-emergency call can wait a bit, call the police AFTER their shift change, NOT just before it! The responding officer will likely be in a much better frame of mind if he just came on duty, instead of having been minutes away from going home before you called with something that could have waited. Next: If you spot an off-duty LEO, please don't take that as an opportunity to air your grievances or complaints. I know that the mantra is that we're cops 24/7, but the truth is, we don't wear the uniform all of the time. We're like anyone else; our off-time is reserved for us and our families, and nobody wants to have their job interrupt them on their own time. Food for thought.
Seen on a bumper sticker: "Exercise. Eat right. Take vitamins. Die anyway."