S5·E104 Saturday Night Fever

DC Carver is at the hospital checking on a stabbing of a drug dealer. WPC Martella has some info about the deceased which prompts DS Burnside to bring in a couple of suspects. Sgt. Peters is having a busy time in Custody. PC Garfield and WPC Brind bring in a girl who has knocked her mother out. Brind has to search her, and is hit by the girl who later tries to hang herself in her cell. It turns out she had stabbed her boyfriend, who turns out to be Carver's victim.