"Ladies and gentlemen…the story you're about to hear is true…"

Dragnet, a term which actually refers to the systematic and coordinated way searching for a wanted person, was also used to pertain to a police drama series that aired from September 1949 to February 1957 in NBC Radio. For 30 minutes per episode, the show featured real police stories in a simple, investigatory style.

The show was said to be inspired by a film called "He Walked by Night," which was released in 1948. In that film, Jack Webb, who portrayed Dragnet's main character Sergeant Joe Friday, was given a small role. Through the help of the Los Angeles Police Department, Webb was able to present true cases, which became the trademark of Dragnet. It narrates every facet of police work—from paperworks and patrols, to crime scene investigations, laboratory works, and interrogation of suspects and witnesses.

As the most popular and influential police series in the history of American media, Dragnet was able to provide its audience the impression of what a real police life could be like. It was well-liked by most radio listeners, as well as police officers. Due to its success, the series also had its television adaptation.

"From beginning to end, from crime to punishment, Dragnet is the story of your police force in action."