Dragnet, the brainchild of Jack Webb, may very well be the most well-remembered, and the best, radio police drama series. From September, 1949 through February 1957, Dragnet's 30 minute shows, broadcast on NBC, brought to radio true police stories in a low-key, documentary style. The origins of Dragnet can be traced to a semi-documentary film, "He Walked by Night" from 1948, in which Webb had a small role. Both employed the same Los Angeles Police Department technical adviser, used actual police cases and presented the case in "just the facts" manner that became a hallmark of Dragnet.The ominous four note introduction to the brass and tympani theme music, titled Danger Ahead, is instantly recognizable as well as the shows opening narration:

"Ladies and gentlemen, the story you are about to hear is true. Only the names have been changed to protect the innocent."