What caused the dramatic tipping point in deadly shootings?

Aired: 8/4/2015 | 0:08:45 | Clip
Why has there been a dramatic spike in homicides this year? Judy Woodruff speaks to Col. Sam Dotson, chief of the St. Louis Metropolitan Police Department, and Edward Flynn, chief of the Milwaukee Police Department, two cities that have seen a substantial rise in murders, about the wide availability of guns, scrutiny of the criminal justice system, an increase in heroin use and systemic poverty.