gang members outnumber police by a ratio of 8 to 1 in cook county. faced with insurmountable odds, authorities curb what gang violence they can. the way to go stretching across 1,000 square miles. the gangs are inherently very smart in the sense that they will go to the areas of least resistance. a lot of these suburban apartments are horribly undermanned and so we ve become sort of the layer over everything else. we don t have any geographical limitations. we go everywhere. and the critical key to their success, jailhouse intel. investigator drake carpenter talks to 30 to 50 inmates a week. he is sussing out this wannabe informant, hoping he can provide an in to the south side drug trade.