I have only watched first 6 minutes since it's 25 minutes long. So it still happens. They know the law but they don't care. We have to keep fighting and fighting against discrimination, not only at prison but everywhere else as well.
I remember the story Ridor9th told about his incarceration. Oh man, it sucked. He had no way to contact his family/lawyer because the provided TTY was not working. The officers didn't give shit at all. The last time I heard was that he filed a lawsuit. I believe that he won.
I also believe that one or two of the prison guards have a feeling toward deaf prisoners. The rest of them are evil.