. >> last year we met up with tanya bimp. she birch. her son was shot down on chicago's south side. >> when i was passing out my flier i was told at least 150 to 200 saw it. >> and no one came forward? >> not a one, no one came forward. >> tanya told me, nothing has changed, a sense of incommunication, a no-snitch mentality. >> trying to make it through a day, thinking about i wonder is someone going to come forward saying this is what happened to my son? he wasn't perfect but he wasn't a bad child neither. knowing that his case could be solved if people would come together and say what happened. >> and as the heat starts chicago residents are bracing or the another summer season. >> i'm not looking forward to any parents joining this club that i'm in since i lost my son. it is heartbreaking seeing you can't get over it. >> august marks the sixth anniversary of the shooting of tanya birch's son. the clear rate for homicides many are skeptical that any further charges would do anything to deter crime. they pointed to a civilian fact that

. >> august marks the sixth anniversary of the shooting of tanya birch's son. the clear rate for homicides many are skeptical that any further charges would do anything to deter crime. they pointed to a civilian fact that before can you prosecute these perpetrators you have to catch them. police point to a steady stream of guns as being the core problem. 7,000 illegal firearms, and that could turn a playground fight into a murder investigation. ali. >> ash-har quraishi here in chicago with me, thanks ash-har. next the ferguson effect, are criminals becoming bolder because police are atrade to make arrest? 18th police sentiment to blame? special segment from chicago continues in just two minutes. tblpminutes. minutes. >> we've been talking about the surge in crime in many big cities in america. the question is what is causing the spike. one theory gaining traction is the so-called ferguson effect. heather, with the manhattan institute, she blames the growing crime rates on antipolice sentiment after the shooting of michael brown last year. i think you saw the ex

. >> last july we met up with tanya birch. since 2009 she has been searching for the shooter of her 15-year-old son dionte smith. >> i was told from the time i go out and pass out my flier i was told at least 150 to 200 people. >> and no one came forward with information? >> not a one no one came forward. >> tanya told us not much has changed. witnesses refused to come forward. the case remains unsolved and today her pain is still raw. >> getting up and he's not here. trying to make the through a day. thinking about i wonder, is someone going to come through and say, this is what happened to my son? knowing that he wasn't perfect but he wasn't a bad child neither. knowing that his case could have been solved if people would come together and say what happened. >> reporter: and as the weather heats up chicago residents are bracing for another deadly summer season. >> it seems the more warmer the weather is the more killing there is. and i'm not looking forward to any more parents joining the club i'm in since i lost my son. it'

. >> reporter: last july we met up with tanya birch.er son was gunned down outside of a party on chicago's south side. >> i was told from the time when i would go out and pass out my flier, i was told at least 150 to 200 people saw what happened. >> reporter: she tells us little has changed since we met a year ago. witnesses refuse to come forward. the case remains unsolved and today her pain is still raw. >> getting up and he's not here. trying to make it through a day, thinking about i wonder is someone going to come through and say this is what happened to my son. knowing he wasn't perfect, but he was ant bad child neither. knowing his case could have been solved if people came together and said what happened. >> reporter: and as the weather heats up chicago residents are bracing for another dangerous season. >> it seems like the warmer the weather is the more killing there is. and i'm not looking forward to parents being in my situation. >> reporter: city officials point to a steady flow of firearms firearms coming into the city. an