I too had to disclose an incident at UH. I think their application said to supplement as needed. I went to the court house and got a printout/copy of my "final disposition." I submitted this with my application.
When I received my acceptance letter, they did not ask me for anything else.
Also, this was the only school I supplemented. When I received my acceptances (even to Baylor), they did not ask for documentation.
My incident was about 7 years ago and they still had record. But you may have to go to the actual courthouse where it was filed.
Hope this helps... Keep me posted.