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The working titles of this film were Contraband and Partners in Crime. Opening credits include the following written dedication: "In their never-ending task of law enforcement, the officers of the Bureau of Narcotics and the Bureau of Customs of the United States Treasury fight many battles, such as the one you are about to see. Their successes are a tribute to their skill, intelligence and courage. To these fearless officers, we respectfully dedicate this picture." Voice-over narration, spoken by Howard Duff as his character "George Morton," is heard intermittently throughout the film. According to March 1949 Hollywood Reporter news items, Leif Erickson and Jeff Chandler were cast in the picture, but neither actor appeared in the final film. Some scenes were shot in San Francisco, CA, Tucson, AZ, and Nogales, Mexico.