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Cast for season 21, episode 44 "Use of Protocol (Part One) (318)"

Former undercover officer Zain Nadir agrees to a stint with Sun Hill CID to wrap up the investigation into Joshua Armstrong. He and Perkins begin an operation to nab local dealers to work their way up the food chain. Nadir manipulates one of his old friends into revealing the location of Armstrong's drug-making factory. Meanwhile, Stamp and Kapoor deal with a market trader selling counterfeit goods, but he responds to his arrest by making a false allegation of assault against Kapoor. Hemmingway is suspended from duty following the death of Lee Thomas, which has a knock-on effect when Tony confronts a group of crackheads, seizing their rocks – and finds himself on the receiving end of a savage beating. Meanwhile, Harman visits husband Scott in jail, but later receives devastating news about him.

Final appearance of Scott Burnett, Debbie Chazen guest stars

Season 21 index | <<< S21E43 "Attack of Conscience (317)" | S21E45 "Use of Protocol (Part Two) (319)" >>>