see a suspect go home. put them to bed so to speak. you're confident he's going to stay in there for the night. >> as the drug dealers are put to bed, lieutenant detective robert merna's son, eric, patrols the streets of roxbury with his partner, mike burke. >> my father's been a police officer for 25 years. now he runs the drug unit citywide. >> eric may have a high-ranking cop for a father, but the rookie isn't looking for any shortcuts. >> i work in roxbury 4:00 to midnight. the busiest shift we have in the city. if i wanted to take the easy way out, that wouldn't be where i work. a lot of the guys i work for worked with my father. break my chops. it's all in good fun. >> 103. somebody broke in through the front door there. >> okay.