The District S02E06 - Melt Down

When a 7-year-old boy shoots two children, Mannion makes it his mission to find exactly how the boy got his hands on a gun. When Mannion questions the 7-year-old, he learns the youngster took the weapon from his 15-year-old brother, who reveals he got the gun from a "guy on the street" near his school. With the help of Temple and Debreno, Mannion sets up a sting and discovers that the weapon was a gun that the police had confiscated in a "buy-back" program. With the Public Safety Commission breathing down Mannion's neck, he must track down the culprits before any more guns hit the street or children get hurt.