Blazing Dragnet(1975)

Although it is a detective drama, most of the detectives in this series usually work in uniform in the accounting or traffic departments of each precinct. They are a "special secret investigation team" that only gets active when a case occurs and they are called together. Their existence is kept secret even within the police force itself. When a case occurs, the detectives are so thorough that they take time off from their regular duties to investigate.