After the Kansas City boy was killed in June by a gunshot meant for somebody else, the Trump administration launched a nationwide crackdown on violent crime named in his honor.
The Associated Press obtained access to briefings and law enforcement operations for an inside look at Operation Legend as Barr visited law enforcement officials in Detroit, Kansas City and Cleveland.
In Detroit, agents circled a motel that police officials said had been a hotbed for criminal activity for years.
As of Friday, there had been 125 homicides in Kansas City this year, according to police statistics.
He says the increases in violent crime have been triggered by high unemployment and a lack of services to deal with untreated mental health problems.