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. It is interesting to note that Webb employed that format in other radio series, some pre-dating the film mentioned above. Dragnet was a long running radio and television police procedural drama, about the cases of a dedicated Los Angeles police detective, Sergeant Joe Friday, and his partners. The show takes its name from an actual police term, a dragnet, meaning a system of coordinated measures for apprehending criminals or suspects. Dragnet was perhaps the most famous and influential police procedural drama in American media history. The series gave millions of Americans a feel for the boredom and drudgery, as well as the danger and heroism, of real life police work. Dragnet earned praise for improving the public opinion of police officers.