The department's case against prison gangs is building and the rookies must learn how to find evidence that will take them down for good. Purto redeems himself with the STIU unit and assists in a major SNM drug bust. D'Angelo finally finds drugs in the open dormitory. Mangin and Cordova respond to an emergency involving an irate inmate. Fabian gets discouraged and has to call his brother for some help.

Violence is a way of life in prison and the threat of it keeps both COs and inmates on constant alert. Zach investigates a fight while Keith deals with unstable and violent inmates. Ariel is a "rover" wrestling with the uncertainty that comes with the job. And PNM's tragic past, which includes the bloodiest prison riot in American history, acts as both a haunting reminder and a catalyst for change.

Violent attacks are on the rise in the prison and things can go from zero to 100 in an instant. Rookie COs must be vigilant at all times to prevent a disaster. Mangin must subdue a volatile inmate when he swallows unidentified contraband. A fight between gang members breaks out in Chaz's unit and Javier's first assignment as a CO is yard duty. Tired of the violence and stress, Ariel quits the job. Meanwhile D'Angelo moves to PNM in the hopes of getting to see more action.

After a few months on the job, the rookies are starting to find their footing as officers while others are falling behind. Lilly works control in an SNM pod that has been locked down after a recent murder. Chaz gets ready for an extraction, meanwhile a new cadet, Javier, excels in the training academy. Fabian makes a serious mistake that puts his job in jeopardy. Ariel begins to doubt her career choice and stops showing up to work.

Working in corrections tests patience and courage each day and is beginning to take a toll on the rookies. Mangin and Cordova must subdue a gang member after he threatens them. Israel refuses to follow prison protocol when a former SNM gang member intimidates him. Lilly gets a confidence boost when she discovers drugs in an inmate's mail. Purto is called to a special assignment discharging a high risk inmate.

Inmates are called convicts for good reason. Once inside, they have nothing but time to conjure up ingenious ways to hide contraband and manipulate COs. Mangin gets conned by a career criminal and Andrew helps STIU bust a drug dealing gang member. Ariel deals with the challenges of being a female CO.

Even the best training can't prepare a rookie Corrections Officer for the physical demands and emotional rollercoaster of their first year on the job. At the Penitentiary of New Mexico (PNM) a group of rookie COs embark on their new career. Zach experiences his first use of force, 19-year-old Tyler makes a frightening discovery, an unruly inmate tests Carlos and Ariel is out to prove everyone wrong.

With a few months on the line under their belts, the rookies are beginning to understand the harsh realities of their new careers. Keith is at a crossroads while Andrew tries to find the balance needed to be an effective officer. The training wheels come off as Ariel is tested during an emergency.

Gangs are the number one threat to maintaining order at PNM. Members are organized, loyal and often violent. Francisco responds to a fight while Tyler crosses the line with a gang leader. Keith assists PNM's elite gang unit and new CO Cohen Mangin aims to prove he has what it takes to follow in his family's footsteps.

The hardest lesson for a rookie CO to learn is the difference between forcing respect and earning it. New CO Andrew's aggressive approach rubs inmates the wrong way while Keith tries to get ahead of a potentially volatile situation. Francisco confronts a lying inmate and Ariel faces her first day on the line. And for one Rookie, the job proves to be too much.