Brett: Why am I being detained officer? (directed toward Officer #4)
Officer #4: You better stop runnin your mouth or the other officer will find a reason to lock you up tonight. (Audio can now be heard again) 3:22
Brett: You're saying you're going to make up a reason to arrest me? Officer #4: No I didn't. I said we would find a reason.
Brett: Okay. I just want to let you know all of this is being recorded.
Officer #4: That's good, we're recording it too. Do what he tells you to do--
Brett: I don't have a right to talk right here in a normal voice?
Officer #4: Yes you do.
Brett: You're saying I'm going to be arrested.
Officer #4: I'm just saying...
Brett: You just said you‘re going to find a reason to lock me up.
Officer #4: I said do what he telld you to do.
Brett: You said if I keep runnin my mouth, I will be locked up.
Officer #4: I said he'll find a reason.
Why are you going to find a reason to lock me up when I'm only asking why I'm being detained in a normal voice?
Officer #4: Do what he tells you to do.
Brett: Am I being detained?
Officer #4: Yes you are!
Brett: May I leave?
Officer #4: No, you may not.
Brett: Why am I being detained?
Officer #4: Because you don't have a driver's license.
Brett: I do have a driver's license. I gave it to the other officer.
Officer #4: When the other officer comes back--When he comes back--When he comes back you can talk to him about it.
Brett: Why are you saying I don't have my license?
Officer #4: Nineteen years old and you know everything.
Brett: Yes sir.
"You better stop runnin your mouth or the other officer will find a reason to lock you up tonight."
There is no threat there, only speculation (and possibly a warning to snot nosed punk to quit being an ass so you can proceed through the checkpoint.)