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The working title of this film was Mr. Gideon. Hollywood Reporter news items provide the following information about the production: In 1941, producer Roy del Ruth bought the title rights to Weldon Reeder's This Week magazine story, "Red Light." As noted in the onscreen credits, however, the film's story was based on Donald Barry's short story "This Guy Gideon," and not on Reeder's work. Alice Faye, Shelley Winters and Carmen Miranda were considered for roles in the picture, but do not appear in the completed film. Actors Homer Crane, Lily Hoffman, Jimmy Phillips, Cathy Carter, Margaret Burkett, Roddy Currie, Alice White and Joel Marston were also considered for parts in Red Light, but their appearance in the completed picture has not been confirmed. Virginia Mayo was borrowed from Warner Bros. for the role of "Carla North." Portions of the film were shot on location in San Francisco, Sacramento, San Quentin Penitentiary, Carmel and Monterey, CA and Reno, NV. Hollywood Reporter also announced that the production would be the first feature film to utilize magnetic sound recording instead of optical sound.