Trapped is a 1949 semidocumentary film noir directed by Richard Fleischer, written by George Zuckerman and Earl Felton. The drama features Lloyd Bridges, Barbara Payton, John Hoyt, and others.
Like many semi-documentaries, the film begins with a voice over footage of the treasury department, telling the story what the department does. Then it quickly begins the story once a woman tries to deposit a twenty-dollar bill at the bank that turns out to be phony.
(Summary from Wikipedia)
Copyright Info: This movie is in the public domain and is legally available for free on YouTube.