The constitutional test. Checkpoints are a narrow Fourth Amendment exception with strict requirements. See Checkpoints and Roadblocks in search and seizure.
An Exception That Comes With Strict Rules
A DUI checkpoint is one of the few stops that needs no suspicion of you in particular. The United States Supreme Court held in Michigan Department of State Police v. Sitz, 496 U.S. 444 (1990), that sobriety checkpoints are not, by themselves, unconstitutional. Florida allows them, but surrounds them with strict rules precisely because they let the police stop drivers who have done nothing to draw attention.
Because a checkpoint stop happens without any individualized suspicion, Florida courts treat it as a seizure that has to be justified by the procedure itself. The written plan, and the discipline with which officers follow it, stands in for the suspicion the police would otherwise need. When that procedure is missing or ignored, the justification for stopping you goes with it.
The Written Plan Must Exist First
The leading Florida case is State v. Jones, 483 So. 2d 433 (Fla. 1986), where the Florida Supreme Court held that a written set of uniform guidelines must be issued before a roadblock is used, and that those guidelines should cover the selection of vehicles, detention techniques, duty assignments, and the disposition of vehicles. The court reinforced the point in Campbell v. State, 679 So. 2d 1168 (Fla. 1996), describing the requirement as particularized advance planning followed by strict compliance.
Field Officers Cannot Pick and Choose
The plan has to fix in advance which vehicles are stopped, for instance every third car during a set window, so that the officers in the field are not deciding on the spot. An officer who deviates from the plan, or who singles out a vehicle that looks suspicious, has stepped outside the very thing that makes the checkpoint lawful.
What a Defective Checkpoint Means for Your Case
If the State cannot show a sufficient written plan, or cannot show that the officers in fact followed it, then the evidence gathered at the stop can be suppressed. Because everything in a checkpoint case flows from that initial stop, a successful challenge often ends the prosecution, even where the breath result was high.
What the Defense Looks For
The first step is to get the operational plan itself through discovery and read it against what the officers did that night. The questions that matter are concrete: was the plan in writing before the checkpoint began, did it fix how vehicles would be selected and how drivers would be detained, did it assign duties in advance, and did the officers follow it without improvising. A gap between the written plan and the conduct in the field is what turns a checkpoint stop into a suppression issue.
These cases turn on detail, and the detail is in the paperwork. Reviewing the plan, the supervisor's briefing, and the field notes side by side is how the weak points come into view.
Related: The DUI stop, and All DUI defenses.
I started out as an Assistant Public Defender in Florida's Thirteenth Judicial Circuit, in Tampa, and today I am one of six ACS-CHAL Forensic Lawyer-Scientists in Florida. Every DUI I take gets rebuilt from the first contact forward, the stop, the exercises, the arrest, and the test, because a problem at the front of the case reaches everything that comes after it. Learn more about my background.
Checkpoints are also not the only high-volume DUI operation run around Tampa Bay. Pinellas deputies are known for Wolf Pack operations, a concentration of deputies saturating one area for a night, and most nearby agencies lean on saturation patrols rather than fixed checkpoints. Those operations follow different rules, because each stop still needs its own lawful basis. I cover how they work locally on the Pinellas County DUI and Hillsborough County DUI pages.
Common Questions
Are DUI checkpoints legal in Florida?
Yes, but only under strict rules. The United States Supreme Court allowed sobriety checkpoints in Michigan Department of State Police v. Sitz, and Florida permits them so long as the agency follows detailed written guidelines set before the checkpoint.
What makes a DUI checkpoint illegal in Florida?
A checkpoint can be invalid if there were no written guidelines issued in advance, if those guidelines did not limit officer discretion over which cars to stop, or if the officers did not follow the plan. Florida courts require advance planning and strict compliance.
Can a checkpoint DUI be thrown out?
It can. If the State cannot show a proper plan or that officers followed it, the evidence from the stop may be suppressed, which often ends the case even with a high breath result.
This page is general information about Florida law, not legal advice, and it does not create an attorney-client relationship. Driving under the influence is defined in section 316.193, Florida Statutes, and actual physical control is addressed in Florida Standard Jury Instruction 28.1 and the decisions discussed here, all of which are fact-specific. Outcomes depend on the particular record, and the law changes, so confirm current requirements with an attorney. Past results do not guarantee a similar outcome.
