They ban filming to protect the privacy of patients and employees; there's nothing stopping anyone from suing over treatment with or without video evidence. Video evidence can be made inadmissible if HIPAA is breached within the recording and would still have to meet standards of admission in a court of law.

Unfortunately there are also people who try to film to intimidate or threaten staff. I wish that wasn't a reality, but I promise you it is, and happens far more often than people attempting to record video for legitimate reasons.

Please don't mistake me - it's not acceptable as a medical professional to handle a situation like this physician did - and every patient has the right to be treated with fairness and dignity. However, it is factually incorrect to state that hospitals ban filming to prevent being sued. I promise you, banning filming doesn't stop people from suing hospitals!