Many of us are familiar with the concept that people who have been accused of crimes are presumed innocent until proven guilty in a court of law. Maybe we only know this as a phrase police use in television shows, but it is in fact a very important legal principle. It means that once a person has been accused of a crime, they have the right to due process and to defend themselves against the charges. This principle applies to all kinds of crimes.
Some speeding violations don't fall under criminal law, but the basic principle applies to speeding violations as well.