To survive behind bars, inmates must find their place and a balance between prison protocol and the convict code.
A look behind the scenes at some of the country's most secure prisons and how inmates are passing drugs, weapons and deadly orders.
Violent murders escalate in Juarez, making it the murder capital of Mexico.
Sacramento County Jail; a couple is charged with torture; a woman's addictions land her in jail; rumors of an imminent attack against officers.
Officers at Hillsborough County Jail in Tampa, Fla. put their lives on the line to keep inmates safe and under control.
The Mexican Mafia battles a local prison gang at Bexar County Jail in San Antonio, Texas.
Inmates in the largest county jail in Denver take advantage of the run down facility to make weapons before being moved.
Criminals in Cleveland, Ohio must pass through the Cuyahoga County Jail, home of the county's infamous Special Response Team.
Nuevo Laredo is known for its violence and corruption.
Tensions threaten to erupt at any moment at the St. Louis County Jail.
Convicted sex offenders at Fremont Correctional in Colorado discuss their crimes, their experiences behind bars and the facility's intensive therapy program.
Maryland struggles to contain all of its female felons in one prison, the Maryland Correctional Institution for Women.
Alaska Bush Troopers have the challenging and dangerous job of traveling vast distances by airplane, boat and snowmobile to fight crime.
Violent juvenile felons are given one last chance at rehabilitation at Colorado's Youthful Offender System, where failure means continuing on to prison.
Officers and counselors at Wayne County Jail in Detroit struggle to rehabilitate female offenders and keep them from returning to crime.
After 14 years in prison, a convicted armed robber finds his first 90 days on the outside even tougher than the world he is leaving behind.
The Stateville Correctional Center in Illinois is one of America's most perilous prisons, with 60 percent of the inmates serving time for murder and 20 percent for rape and other violent crimes.
The overcrowded Multnomah County Detention Center may be worse than prison.
Iowa's Fort Dodge Correctional Facility staff must find unique ways to handle the impulsive, immature and often violent men, ages 18 to 25, that it houses.
New recruits at the understaffed Wyoming State Penitentiary face the challenges of training, manipulative inmates and working in a prison with a history of violence.
Outnumbered guards use military-like discipline and force to stay in control in the Tent City jail in the Arizona desert.
Three recruits struggle with their inexperience in the prison environment at Wyoming State Penitentiary.
One in four inmates in the Utah State Prison has gang ties, with members of one gang's loyalties so extreme that they put it first at any cost.
Inside Alexander Correctional Prison, there's a constant struggle for control; the staff employs a variety of control methods, but the prisoners don't always play by the rules.
California's Valley State Prison deals with violent inmates, overcrowding and heavy drug-trade.
Inmates at Salinas Valley State Prison in Soledad, Calif., participate in nearly 200 gang-related fights a year.
The Oak Park Heights Supermax combines architecture, technology and expertly trained staff to control violent prisoners.
Ohio's Lebanon Correctional Institution is overfull and behind the times.
California's Pelican Bay State Prison leads the war on prison gangs.
Rival gangs go to war in prison.
With approximately 3500 new bookings per month, the jail lacks the space, the staff and the resources to accommodate its prisoners.
Gang wars have spilled into the state's only maximum security prison.
In the Alaskan outback, alcohol abuse is devastating communities and sending crime rates through the roof.
At Ironwood in California, inmates trying to better themselves face opposition from their own gangs.
Inmates go to great lengths to try to break out of Colorado's Sterling Correctional Facility.
Meet the women who are spending their lives behind bars; in prisons where fear and violence are commonplace, some of these ladies feel right at home.
Casuarina Maximum Security is the toughest jail in Western Australia and was the site of the bloodiest prison riot in the history of Australia.