police procedural
US /pəˈliːs prəˈsiːdʒərəl/
UK /pəˈliːs prəˈsiːdʒərəl/

1.
a genre of fiction, film, or television that focuses on the investigation of a crime by police officers, often detailing the step-by-step process of police work
:
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She enjoys reading police procedural novels that delve into forensic details.
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The new TV series is a gritty police procedural set in New York City.