The fourth season of the show introduced an examination of the Baltimore city school system and many new characters including pupils, staff and education board employees.
Howard "Bunny" ColvinEdit
Colvin was a thirty-year veteran of the Baltimore Police Department and a district commander before his radical policies caused his forced retirement. He moved into working with potential repeat violent offenders in the school system.
Marcia Donnelly is the Assistant Principal of Edward J. Tilghman Middle School.
Miss Duquette is a doctoral student who works as a teacher in the violent behaviour research programme.
Parenti is an academic leading a research team conducting a study about preventing violent behaviour.
Roland "Prez" PryzbylewskiEdit
Prez is an ex-detective who showed great aptitude for surveillance and wiretap cases but struggled to maintain his composure in the field. He has embarked on a new career as a middle school math teacher.
Grace Sampson is a senior teacher at Edward J. Tilghman Middle School.
Miss Sheperdson is a bureacrat at the Department of Education.
Claudell Withers is the Principal of Edward J. Tilghman Middle School.
Namond Brice is a tough-talking eighth-grade student who struggles to follow in the footsteps of his father, Wee-Bey.
Zenobia Dawson is a troubled eighth grade student.
Donut is a younger student with a penchant for auto crime.
Crystal Judkins is a hard working and conscientious eighth grade student.
Albert Stokes is a foul mouthed and disruptive diminutive eighth grade student.
Darnell Tyson is a sometimes disruptive eighth-grade student from a criminal family.
Randy Wagstaff is an enterprising eighth-grade student who is dependent on social services.
Duquan "Dukie" WeemsEdit
Duquan "Dukie" Weems is an intelligent eighth-grade student who lives in abject poverty.
Karim Williams is an eighth-grade student who hopes to become an NBA basketball player and sports an afro.