This third-grader was shackled and crying out in pain for 15 minutes. He was restrained because of behavior related to attention deficit hyperactivity disorder and a history of trauma. A member of the school's staff videotaped the incident.

Students with disabilities represent 12 percent of public school students but are 75 percent of all students subjected to physical restraint at school, according to the U.S. Department of Education.

Students of color and students with disabilities are especially vulnerable to push-out trends and the discriminatory application of discipline. One child in this case is Latino, and the other is African-American.

Law enforcement in schools must be trained on how to work with children with disabilities and trauma. Learning de-escalation skills should be as common as fire drills for schools and any law enforcement officers who serve them.