How do you know? Maybe he stuck a guy in a cop's uniform!
4 seconds sound clip from the The Enforcer (1951) movie soundboard.
You can hear this line at 00:05:06.184 in the Blu-ray version of the movie.
Quote context
[...]
- With what I've got on you, Rico, I could burn you a dozen times.
- He's locked up in a cell, 9 stories below.
- How do you know? Maybe he stuck a guy in a cop's uniform!
- Yes? Oh, anytime tonight will do.
- Oh, say, what's that siren? Uh-huh. It's the Mayor. He's late for an appointment.
- You're lying. It's Mendoza. He's busting loose.
- I tell you he's locked up in his cell!
[...]