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->''"For the next thirty minutes, in cooperation with the Los Angeles Police Department, you will travel step by step on the side of the law through [[RomanAClef an actual case transcribed from official police files]]."''

Archetype of the PoliceProcedural, this first installment in the ''Franchise/{{Dragnet}}'' franchise followed the exploits of Sgt. Joe Friday and his various partners as they investigated crime in Los Angeles. The radio series ran on Creator/{{NBC}} from 1949-1957. Barton Yarborough portrayed Friday's original partner, Sgt. Ben Romero, from the start of the radio show until his death in December 1951. He was briefly succeeded by a few different partners, most prominently Barney Phillips as Detective Sgt. Ed Jacobs, before Ben Alexander took over as Officer Frank Smith from late 1952 to the end of the radio run.

Friday and his partners rotated through the various departments from week to week, allowing them to solve not only murders, but also fraud, arson, and drug-smuggling. Each episode ended with an announcer giving [[WhereAreTheyNowEpilogue the results of the perp's trial]]. The show spawned a number of {{Catch Phrase}}s and featured an iconic four note {{Sting}} used as a ThemeTune.

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!!''{{Radio/Dragnet}}'' provides examples of:

* BiblesFromTheDead: A gang uses this con in "The Big Betty," albeit with cheap watches and other bits of useless junk rather than Bibles.
* BrokenAesop: In one episode, ".22 Rifle for Christmas", the two investigate the shooting of a child near Christmas. They learn it was done accidentally by the boy's best friend when they were playing with the boy's Christmas gift, a rifle. The dead boy's father storms over to the friend's house, but when he sees how hurt the boy is over the loss of his friend, gives the boy all the dead child's Christmas toys. Lesson learned: kill your friend and you get all their toys. However, it is also made pretty clear the victim's friend is deeply remorseful, and that both families have been, perhaps, permanently damaged by the shooting.
* CatchPhrase: Originator of several examples which became frequently used or parodied, including "The story you are about to hear is true" and "My name's Friday."
* ChristmasEpisode
** ".22 Rifle for Christmas", which lives up to its ominous title (see the [[Tearjerker/{{Dragnet}} TearJerker page]] for more details).
** "The Big Little Jesus," though it qualifies as a radio episode only by virtue of being aired on the radio - all Webb did was lift and broadcast the soundtrack from the TV version.
* {{Dedication}}: Each of the first several episodes of the radio version was dedicated to a police officer killed in the line of duty.
-->"This episode is dedicated to [insert name], who on the [insert general time ('morning of', 'evening of') and date] gave his life so that yours might be more secure".
* EarlyInstallmentWeirdness: "Homicide: Quick-Trigger Gunmen" uses different theme music, and Friday himself gives the WhereAreTheyNowEpilogue. "George Slocum: Thief" probably did it the same way, only [[MissingEpisode we cannot know for sure]].
* {{Expy}}: In the 1960s TV revival, Friday's partner is Officer Bill Gannon, whose personality and banter with Friday are very similar to Officer Frank Smith, Friday's final partner in the radio and 1950s TV series.
* HighVoltageDeath: In one story, a burglar means to tunnel into a bank. But just as Friday and Smith move to arrest him, he hits a power cable.
* IdiosyncraticEpisodeNaming: Most episodes of the series were titled "The Big (something)".
* ImpersonationGambit: The plot of #72, "The Big Meet", involves Friday impersonating the local contact that a major drug lord plans to use to distribute a batch of his product through.
* InfantImmortality: Averted hard on with the February 2nd, 1950 episode "Claude Jimmerson: Child Killer" which featured a double homicide (and implied rape) of a 7 year old and an 11 year old.
* ItsPronouncedTroPay: Archaic pronounciations for "Los Angeles" (Los ANG-el-ess, with a hard "G" sound compared to a soft "G" or "J" sound that comes out "Los An-jel-ess") and "California" (Cal-i-forn-ee-a) are often heard.
* LateArrivalSpoiler: Many radio episodes in the archives are titled with the name of the person ultimately proven guilty.
* LeaningOnTheFourthWall: In the 61st radio production, "The Big Actor", Friday and Romero [[PerpSweating interrogate]] a suspect between takes of a scene in a movie. The last line of the scene is [[spoiler:a police detective saying, "We've got our man."]]
* MommasBoy: Middle-aged bachelor Friday still lives with his mother.
* MyGodWhatHaveIDone: The culprit in "The Big Crime". The only thing he's glad of was that he [[spoiler:forgot the pocketknife--he'd have killed the kids had he remembered it]].
* NothingIsScarier: One of the episodes involves the search for two missing girls (ages 11 and 7). When their bodies are found, Friday gives what they had looked like in life, the fact that the corpses were holding wildflowers--and the fact that a veteran homicide detective had never seen such a sight as those corpses before and never hoped to again.
* OpeningNarration
* ParentalNeglect: Several episodes involved this, including some where one of the children was too far gone with an illness or injury to save.
* RadioDrama
* RealLifeWritesThePlot: Barton Yarborough's sudden death occasioned the writing of a special episode in which he and his character were given a fond farewell.
* RedShirt: Any cop Friday knows who is introduced for the first time at the start of the episode and who talks about having plans for the evening or weekend at an episode's beginning is likely to be killed very soon.
* SeinfeldianConversation: Usually instigated by Ben Romero or Frank Smith.
* StandardPoliceMotto: This was the TropeMaker, bringing the LAPD's now-famous motto into the public eye.
* SuspiciouslySimilarSubstitute: Friday's various partners, who are all easy going family men who continually try to teach Joe some task like cooking or teach him a life lesson.
* TriggerHappy: The first episode available involves a holdup trio, the id of whom is best known for entering a liquor store, saying "This is a stickup!", and immediately letting the clerk on duty have it.
* TropeMaker[=/=]UrExample: The first-ever PoliceProcedural. Its success spawned a host of imitators and established the genre.
* VerySpecialEpisode: The radio episode "The Big Trio" was aired on July 3, 1952, and centered around three traffic accidents, [[spoiler: two of them fatal, one of those two involving a motorcycle patrolman]]. Instead of the usual narration describing the fates of the criminals involved, the episode ended with an admonition to drive safely over the Fourth of July weekend.
* YouSaidYouWouldLetThemGo: One radio episode involves a kidnapping for ransom, but it turns out later that the daughter was already dead by the time the father got the ransom note.
* YourPrincessIsInAnotherCastle: In "The Big Make" (Sept. 14, 1950), the officers identify and arrest a good suspect, an ex-con who lied about his alibi and whom the victims identify as their attacker. They figure that the case is just about cleared up... when an anonymous letter arrives in which someone else claims responsibility for the crime and adds enough details to make the claim believable. The detectives scrap everything and start over.
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