the hip-hop generation, mason likes giving his younger customers something extra with their meals. a serving of rap. >> i'll do a short one. i'll do a short one. ♪ my mind's not right but still got game ♪ ♪ bet my dope puts yours to shame ♪ ♪ judges today have it all wrong ♪ ♪ they're far to late to try the bomb ♪ ♪ these crews are cool but they're living in sin ♪ ♪ they're robbing the pharmacies for vicodin ♪ >> when their shift ends, mason and other inmate workers make their way back to their housing unit. >> k-70, sir. >> better known as the workers barracks, it's still jail. but life in the barracks allows for more freedom of movement. and is one of the few housing units where daylight streams through the windows. >> this is where we're coming into the projects here. as we get further down this section we come into the high-rent district. >> mason is serving nine months at theo lacey, convicted of an unusual shoplifting charge.