windy city. >> it does happen here in our own backyard. in cook county, chicago is a transportation hub. it's a convention hub. and it's ripe for this type of crime. >> how did it go in court? >> illinois state's attorney anita alvarez heads up the cook county human trafficking task force, a joint effort by local police and prosecutors to combat the booming underground sex trade in chicago and the surrounding suburbs. >> do your parents know where you are? >> i think that we're really not going to get anywhere or make a dent into this crime unless we as local prosecutors do more. >> in 2011, the illinois safe child act became law in the land of lincoln. giving local police and prosecutors a new set of investigative tools to identify and rescue trafficking victims. provide them with social services and punish the pimps who exploit them. >> i'd like people to think about tht this could be their daughter. >> cook county sheriff tom dart