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As related on http://www.adam-12.com/webb.htm ...

• quote -

In 1949, Jack landed the role of Lt. Lee Jones in the film

"He walked by Night." After meeting LAPD Sgt. Marty Wynn,

a technical advisor for the show, Jack got the idea to develop

Dragnet after being invited to review LAPD case files.

• end quote -

Several elements associated with _Dragnet_ appear already in _He Walked_: not only the stolid narration but also the devotion of time to routine and even futile work, the interviewing of oddballs, the explication of technology, and the incidental chit-chat about the family.

One interesting point is that we never get to find out the killer's motive: even at the expense of the audience's aesthetic satisfaction, the killer's point of view is denied to us. The only lessons we can learn from the movie are the lessons that the police learn.