Defense attorney's statements, which are in the link:
Then, in early October, Jason and Jennifer Arnold retained Rick DeToto, a local Texas criminal defense attorney, to represent their son. DeToto made a red-herring statement to the public when he declared that his client “is a young man in high school with college aspirations. He’s a very new and inexperienced driver. This was a serious accident but did not involve any criminal intent. He immediately called 911, helped with the injured and cooperated with police.”
Rick DeToto continued to prattle on by saying, “The police did an investigation at the scene. This included speaking with eyewitnesses to the accident. After their investigation, they decided not to charge my client and did not even issue him a traffic ticket. Clearly, they determined a crime had not occurred.”
There's no evidence that he called 911 or rendered any aid to the injured.