It's always better with no witnesses.
5 seconds sound clip from the Casino (1995) movie soundboard.
You can hear this line at 02:42:42 in the Blu-ray version of the movie.
Quote context
[...]
- We're going to take a recess.
- When it looked like they could get 25 years to life in prison just for skimmin' a casino...
- Sick or no fuckin' sick, you knew people were going to get clipped.
- So, the day of the arraignment, they had this meeting right in the back of the courthouse.
- See, when something like this happens, you know how things are gonna work out.
- It's always better with no witnesses.
- He won't talk. Stone is a good kid.
- Stand-up guy just like his old man. That's the way I see it.
- I agree. He's solid. He's a fuckin' Marine.
[...]