The problem with having laws is that most people are not familiar with them and don't understand the system. People who do are able to bully those who don't understand. This officer is doing just that bullying people. He is trying to use his knowledge of the system against folks that don't. I don't believe he had intention of having it go to court. He just wanted to shut up the people he, and his station, feel are pests.
They are probably pests that most of use would not like having as neighbors. I bet they where calling the station all the time complaining about there neighbors speeding. There is a bit more background I bet then just this story. That said the tactic the police used to shut them up was not appropriate or just.
It probably backfired on them, since if it goes to a judge it will be dismissed. Judges lucky still have the ability to exercise judgment in most areas of the law. Consider this next time you hear someone pushing of strict minimum sentence rules.
Sadly the people who get hurt most often by this bullying are those that are quite citizens. Slumlords and such often use the laws against people. I took a minor in law just so I would not be totally ignorant of the law. I don't expect most to do so but it would be nice to see more high schools have a required class. I personally think it is more valuable then a sex ed class. (least the one I was forced to take)