De-escalation training for police is not new, but it has received growing attention in recent years, as concerns over the use of force by police have surged. Until recently, little was known about the actual effects of de-escalation training. Robin Engel, Senior Scientist at the Ohio State University, has conducted a systematic review of multiple studies and an in-depth analysis of the effects of de-escalation training in Louisville, Ky. and Indianapolis, Ind. She discusses her surprising findings and offers some insights.