Listen to the episode -- The Unwritten Law
Volume Number: 1
Episode Count: 97
Catalog #: DT-CCAR-1
Volume Number: 2
Episode Count: 102
Catalog #: DT-CCAR-2
Volume Number: 3
Episode Count: 100
Catalog #: DT-CCAR-3
Volume Number: All
Episode Count: 299
Catalog #: DT-CCAR-4
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Calling All Cars aired from 29 Nov 1933 until 8 Sep 1939 and originated on the West coast over the Columbia Broadcasting System. The show was sponsored by the Rio Grande Oil Company which was a part of the Sinclair Oil Corporation. The show only ran in areas where Rio Grande "Cracked" gasoline was sold.
The writer-director of the show was William N Robson. Each episode was dramatization of a true crime story, how each crime was solved and justice served. Episodes were introduced mainly by officers of the Los Angeles Police Department. Sgt Jesse Rosenquist, a police dispatcher was a part of the entire run of the series.