for 18-year-old convicted murderer antonio bobo this is the first family visit he's had since being jailed. >> what do you talk to your cousin about when she comes and visits? >> i ask her what's going on in the streets. you know, how's her life doing, how's the family doing. basic conversation. >> the general population gets 15 minutes four days a week. they're on timers. we push the button, we start up, and it clicks when it goes off. but as soon as the phones shut off the voices tend to get a little loud. guys start to wander from row to row, and we've got to keep an eye on that. we don't want them passing things from other inmates. they can go upstairs with any type of contraband, drugs, any shanks or anything of that nature. >> more than half of the inmates in l.a. county jail don't get visitors. next on "lockup" -- one of the most dangerous assignments in l.a. county jail.