Peter Vieyra

John teaches Ben several key tips to being a police officer, including the proper ways to make a death notification and arrest a suspected drug user. Sammy stays with Nate's family while he sorts out his marital problems. Lydia and Josie handle a drug-related murder case with an unorthodox suspect.

While working a celebrity murder, Lydia discovers the pros and cons of being in the spotlight. Sammy leaves the confines of the office to go out on patrol. John and Ben chafe with frustration over a tedious security detail.

In the season premiere episode, Officer John Cooper returns to duty after recovering from back surgery and meets his new partner, Officer Jessica Tang, a tough and disciplined cop with her own set of baggage from working the streets. Lydia, whose new partner is Ruben Robinson, can't seem to escape helping a former CI (Confidential Informant) who won't stay in safety. Ben, Sammy and Dewey (series regular C. THOMAS HOWELL) chase an armed man into an elementary school, while Ben bumps heads with Danny Ferguson (guest star LOU DIAMOND PHILLIPS), an intense street cop whose cynical attitude is affecting their work.