Read about this in the Times earlier today.
Although I hate speed traps, I am a little concerned about the principle.
This type of thing has happened before.
The law should be about principles. Cases should be brought based upon whether a crime has been committed.
Once prosecutions are decided by how much hassle they cause, then the basic principle of right and wrong is lost.
I am not sure a crime has been committed, but the point is that it is for the court to decide, not some bean counter.