Claudia Nava was recently shown video of her son, who is a mentally challenged-bipolar student, being choked by a bus driver in reaction to his misbehavior on a bus. The incident happened in January, but Nava was never informed of it or shown the video until a news station brought it to her attention. And while Nava was never privy to the choking, neither was the Dallas Police Department when it came to the details of the case. "They're human beings," she said. Nava said step one of her battle will be to see the driver stand before a grand jury.