It's called a lie, or mission creep. I remember seat belt laws, when it started, would only (in most states) be a secondary offense. Meaning you couldn't be pulled over only because you were not wearing a seat belt. Now, years later, the creeping. It's a primary offense, you will be pulled over and ticketed. Even "nighttime seat belt enforcement. No reason to stop a motorist other than to "check" if their wearing their seat belt (IOW, a fishing trip).