Hello again. I just got off the phone with the attorney for the DPS. I thanked him for his letter first. I did not tell him that I was offended by the "cautionary" portion of the letter because I had a feeling that he didn't know the facts of my case. So then I asked him why they decided to drop my case. As it turns out, I was right...he didn't know. The decision to pursue the case was his discretion, and apparently the new laws have removed all penalties for failure to display. He could have taken me to court because the laws aren't on the books yet, but he decided not to.
He was very nice, and seemed surprised that I would take the time to call him. So I explained to him what had happened, and he wasn't surprised by that at all. In his opinion, this was clerical or administrative problem that had started a bureaucratic mechanism that could only be stopped by someone with discretionary power or a ruling in court. There really wasn't much to talk about because the laws are changing the problem is going away.
I originally wanted to ask him to look into or comment on the actions of the officer. But since he didn't have the facts, it would just have been my word. I decided not to get him involved. I've already filed a complaint with the Plano PD. I may follow up with them and let them know that the case was dropped. I'll let the officer's superiors wonder why.
Hopefully, that's the end of the story.