Munoz pronounced a problem resulted from a “system failure†that prevented employees from regulating “common sense†in a conditions and that Dr. David Dao, whom confidence officers dragged by his hands, on his back, from a cabin before takeoff, was not during fault.
Article source: http://www.huffingtonpost.com/entry/united-ceo-police_us_58ee2c78e4b0ca64d91ae435?section=us_travel