ABC World News Tonight With David Muir

Sheriff Jamey Noel has devised an unprecedented program to root out crime and corruption in the Clark County Jail.

Sheriff Jamey Noel's program is underway. Zac, a Marine, Tami, a police officer, Robert, a teacher, and Barbra, a stay-at-home mom, are the first participants in. Will they make it through the first 24 hours inside?

Isaiah, a 19-year-old from a rough neighborhood, and Maryum, a social worker and the eldest daughter of Muhammad Ali

Jeff, the final participant, enters the jail. Isaiah and Robert fear their covers may be blown.

As the seven participants get deeper into the program, Zac's strength as an inmate is tested when he is unexpectedly called to court. Barbra strategically abandons a friendship with Tami in order to survive, and Jeff makes himself a target after a series of catastrophic mistakes.

As the participants approach the midway point, tension and anger grow among the women in F-Pod, while one of the men finds himself in imminent danger from the inmates in C-Pod.

Life in Clark County Jail gets harder for the participants as the days go by. Jeff is physically attacked by inmate Ricky putting the program at risk, while Zac and Isaiah are unexpectedly moved from C-Pod

As the participants cross the halfway point, increased tensions and drug activity in D-pod lead the Sheriff to order a CERT raid, while fear of a contagious rash sweeps through F-pod.

Thanksgiving presents new opportunities and challenges for the six remaining participants, and one of them is pushed to a breaking point.

As the participants near the end of their time in jail, tension in F-Pod pushes one woman over the edge and compromises the program, while both men in D-Pod struggle to avoid criminal activity that may have serious consequences.

As pressure builds in each of the jail's pods, the five remaining participants in the program try to finish up their final few days inside.

Three participants remain in Clark County Jail. One of the women in F-Pod is released, leaving Tami on the verge of a meltdown.

All seven participants meet for the first time to discuss their experience inside.