to target 18- to 21-year-olds as this is the age group when the behavior is most commonly exhibited. He is known to the West Baltimore church deacon who puts him in touch with retired police officer Howard "Bunny" Colvin. Parenti is interested in meeting Colvin because he is well known around campus for his last action in the police department – a program of drug tolerant zones that significantly reduced crime in his district. Colvin takes a salaried position to assist Parenti with his study. Colvin wants Parenti to target younger age groups by showing him that violent behavior is entrenched in 18- to 21-year-olds. A visit to Colvin's old district and introduction to an 18-year-old criminal, who tries to assault Parenti for taking notes, convinces Parenti. Colvin and Parenti decide to focus on eighth grade middle school children and approach the Edward Tilghman middle school with their program. The principal, Claudell Withers, agrees to let them separate children with behavioral difficulties into their own class where they can be targeted and studied. Parenti also gets approval from the education department on Baltimore's North Avenue on the condition that his program does not make any headlines. With the assistance of eighth grade head teacher Grace Sampson and assistant principal Marcia Donnelly he selects a class of ten students. Colvin refers to their target group as "corner kids". They hire a class teacher and assistant to deal with the students. Parenti is fascinated by the behavior exhibited by his students. When the program is eventually terminated, Colvin's frustration is in stark contrast to Parenti's excitement about the attention the research will receive from academics. Roland "Prez" Pryzbylewski 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 Played by: Dravon James Appears in Season 3: "Dead Soldiers" and "Mission Accomplished". Season 4: "Soft Eyes"; "Home Rooms"; "Refugees"; "Alliances"; "Margin of Error"; "Unto Others"; Corner Boys"; "Know Your Place"; "Misgivings and "Final Grades". Sampson is a senior middle school English teacher and is the head teacher for the eighth grade at the Edward Tilghman Middle School. She plays a matriarchal role in the school as many of the students view her as a disciplinary motherly type (all the students act correctly when she approaches them).