What you're gonna do is keep him from having too many reefers.
5 seconds sound clip from the Reefer Madness (1936) movie soundboard.
You can hear this line at 00:45:41 in the Blu-ray version of the movie.
Quote context
[...]
- But they're getting on my nerves.
- What you're gonna do is keep him from having too many reefers.
- Any day now, that punk will get hot.
- He'll probably spill and tell all he knows if he gets the chance.
[...]