Can I be arrested for DUI at a checkpoint?

Yes. Sobriety checkpoints operate differently from ordinary stops. There's no individualized suspicion — you're stopped because you drove through a location where vehicles are being stopped.

That's permissible only within limits. Florida requires that checkpoints be conducted under a written operational plan established in advance by supervisory personnel, addressing things like site selection, which vehicles are stopped, the procedures officers follow, and duration.

The purpose of that requirement is removing field discretion. If officers on scene were choosing who to stop based on their own judgment, or if the plan doesn't exist or wasn't followed, the stop is challengeable.

That plan is a document. It can be requested. Whether it exists, and whether it was actually followed, are questions with paper answers rather than testimony answers.