The asphalt jungle

The asphalt jungle, 1950 (IMDB 7.9)
Dirección: John Huston
Sterling Hayden, Louis Calhern, Jean Hagen, James Whitmore, Sam Jaffe, John McIntire, Marilyn Monroe

Doc Riedenschneider: That copper, he recognized me.
Cobby: How'd you know he was a copper?
Doc Riedenschneider: I can smell one a block off.
Cobby: Oh, don't worry about Ditrich. He's on my payroll. Practically a partner. Me and him, we're like that.
[Cobby holds up his index and middle finger]
Doc Riedenschneider: Experience has taught me never to trust a policeman. Just when you think one's all right, he turns legit.