How efficient are the de-escalation techniques used by police?

In light of the recent shootings in Minnesota and Louisiana, MPR News host Kerri Miller talks with former police sergeant and adjunct professor of psychology Ginger Charles, about the efficacy of de-escalation techniques. And David J. Thomas, retired Gainesville police officer and senior Research Fellow at the Police Foundation, talks about the hands-on training and what civilians can expect from their police force.