I think people should be able to report anything that they see as being wrong. If the 911 service operated the way that this law operates, when you called in you wouldn't be asked which service you wanted. You'd be asked what law was being broken and which section, if you could forward with the proof, and if you'd like to breathalyze the person.
That's the way it works, but you should be able to come forward and say that this is wrong, that you don't know which law it affects, but this is clearly wrong. I'm just a witness. I came along and saw this. I don't have all the information. It's your job to go investigate and figure out what actually happened. Find all the rest of the evidence and find out if I'm just mistaken.