as we've learned from past guests like former new york city police commissioner bill bratten, hot spottingm solving can be a key tool in combatting crime. a group known as the violence interrupters are doing just that. they liken the spread of crime to that of infectious diseases, and their prescribed method of treatment is to go after the most infected and stop the bleeding at its source by physically interrupting conflicts before they escalate. the group is the subject of the critically acclaimed documentary "the interrupters" which has aired on pbs and in theaters across the country. with us now is steve james, one of the filmmakers and anita matthews, one of the violence interrupters profiled in the film. thank you for being with us. >> thank you for having us. >> alina, let me start with you. how do you go after these people? >> the first thing is we have to stop that conflict before it turns into a homicide, so we have -- the public health model to me is so rural that i think of the antibiotic that i troubleshoot that infectious what may be a conflict or crisis and get in and stop it