The principal of Robb Elementary School, who was placed on administrative leave more than two months after a mass shooting there, has pushed back on some of a Texas House committee’s conclusions about campus security. In a letter to the House committee investigating the May 24 shooting, Mandy Gutierrez argued that the door to the classroom the gunman is believed to have entered had a functioning lock, that she was trained not to use the school’s public address system during shooting situations and that there was not a culture of complacency about security at Robb Elementary.