In other words, if a police officer sees the vehicle in question drive right past him and is not committing a violation, it can drive right on its way. However, the officer can follow the vehicle, and the officer discovers it is weaving in and out of its lane, has a taillight burned out, or the license plates are expired, the officer can effect his/her discretion and follow the vehicle observing it for possible other “issues,” then take enforcement action.
Reminds me of my first day in the police academy July 1974. I had an instructor tell our class that criminals are generally lazy and stupid. They don’t necessarily rob banks in stolen cars. They use their own, forget to renew their license plates, have burned out bulbs, and drive like maniacs after committing their own “perfect crime(s).” Ha! They sometimes get caught.