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Oklahoma inmates tell their own remarkable stories.

Half of Chicago's Stateville Correctional Center's inmates are imprisoned for murder.

Inside the maximum security prison inmates call 'the end of the world.'

Inmates at San Quentin State Prison find ways to fight boredom.

Survival is the number one priority for inmates and officers alike inside Corcoran.

Inmates must choose between doing their time or following a more self-destructive path.

There is never a dull moment in prison.

Three of America's busiest and largest jails.

Inmates with nothing left to lose.

In prison, knowing the right answers could mean the difference between life and death.

Prisoners take hostages in the Penitentiary of New Mexico.

Inmates land longer sentences due to bad behavior.

The dangerous inmates of Level Six in the Penitentiary of New Mexico.

Inmates who become disruptive or violent are transferred to the lock-up units in levels five and six.

Prison officials initiate a shakedown after gang members in Level 6 overpower an officer in the recreation area, take her keys and stab a rival gang member.

Some inmates leave prison by 'paroling legit' or in a body bag and others earn time for early parole, but a few will attempt escape.

The experience of interviewing violent offenders in prison.

An inmate feels his survival depends on staying in prison; prison food.

Joining a gang while in prison.

How inmates spend their time in jail.

While visiting Limon Correctional, the Lockup crew is greeted by angry inmates and the cell extraction team is called in to help.

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Violence at the Limon Correctional Facility in Colorado.

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