Kaneohe, interesting story. One of my main pet peeves here in Paradise is those who make a lot of unneccesary noise (not talking about tooting at the car who fails to leave the green light.)
We have a guy in the next building whose motorcycle rattles our windows as he fires it up and leaves. We can hear him until he leaves our particular valley. Just about every night around 2AM or 3AM, a flock of mopeds goes past and revs their engines - apparently just to hear the echo between the buildings and the mountains. Though there are ordinances against excessive noise, to my knowledge, HPD officers never make stops for this unless they have another reason for wanting to stop someone.
My gut tells me the HPD officer was having a bad day and decided to pass it along to your DW. Glad she beat the "rap." But YMMV.