It's not what you know. It's what you can prove.
— Detective Alonzo Harris (Denzel Washington)
6 seconds sound clip from the Training Day (2001) movie soundboard.
You can hear this line at 01:39:02 in the Blu-ray version of the movie.
Quote context
[...]
- And how about the one on your ankle?
- You want the one in my back pocket, too?
- You got one problem, though, Jake. You got no witnesses.
- Who're your fucking witnesses, huh? Roger? Smiley?
- You think my troops are going to help you?
- It's not what you know. It's what you can prove.
- Here.
- Nothing.
[...]