the zillas prosecutors also added what is known as a gang enhancement which could increase his sentence should he be found guilty. >> they can receive an additional sen sentence of four, six, eight years. it can be significant depending on the crime they committed. >> he has pled not guilty and is awaiting trial. >> what's up, loved one? >> carthen says he's already spent most of his life in custody. starting with a stay in juvenile hall at age 10. as an adult he's been convicted three times for possession of cocaine-based drugs for sale. other convictions include possession of a firearm by a felon, resisting arrest, providing false identification to a police officer. authorities say as his rap sheet grew, so did his power in the zillas. >> everybody's saying i'm a leader. i'm not. i'm the most this, this, this, this about me. i ain't the leader of the gang. >> law enforcement on the streets know who he is. law enforcement inside the jails know who he is. there's really no getting around that we know that he's a shot caller. >> carthen is housed in a special maximum security unit on the eighth floor. it's reserved for gang leaders. >> a-west 200 pod is where we