Probable Cause to Arrest

Field sobriety exercises matter most because of what they feed: the decision to arrest. To ask you to perform them, an officer needs only reasonable suspicion of impairment, which is a lower standard than probable cause. The Florida courts have made that explicit, including in Department of Highway Safety and Motor Vehicles v. Haskins, 752 So. 2d 625 (Fla. 2d DCA 1999), so the request itself is usually not where the case is won. What matters is how the result is used.

An arrest in Florida requires probable cause, and the officer builds it from the totality of the circumstances. The driving pattern, the odor of alcohol, your appearance and statements, and the clues from the exercises are combined into a single picture, and the probable-cause analysis for a DUI stop and arrest is set out in Department of Highway Safety and Motor Vehicles v. Possati, 866 So. 2d 737 (Fla. 3d DCA 2004). The exercise clues come in only as the officer’s lay observations, so the weight of that input is open to challenge.

An officer needs only reasonable suspicion to request the exercises, and uses the result, with everything else, to reach probable cause. Each input can be contested.

Odor and appearance are factors, not proof

Officers often lean on the odor of alcohol and bloodshot eyes. Florida recognized in State v. Kliphouse, 771 So. 2d 16 (Fla. 4th DCA 2000), that the odor of an alcoholic beverage alone is not inconsistent with the safe operation of a vehicle and does not by itself establish impairment. Bloodshot eyes have countless innocent causes. These are factors that go into the mix, not conclusions, and when the exercise clues are also weak or poorly administered, the whole basis for the arrest can be questioned.

Challenging probable cause

If the inputs do not add up, the remedy is a motion to suppress arguing the officer lacked probable cause to arrest. That is Fourth Amendment litigation, and it can reach not just the arrest but the breath or blood evidence that followed it. Performing the exercises does not foreclose this, because a poorly supported arrest is still a poorly supported arrest.

The arrest is only as strong as the bricks under it

Probable cause usually comes together as a stack of small things rather than one big moment: the driving, the odor, the eyes, the words, and the exercises. Take those bricks one at a time and they get a lot smaller. The odor of alcohol, on its own, does not mean a person was unsafe behind the wheel, which is the point of Kliphouse. The exercises the officer leaned on were never proof of anything either, and under Haskins the officer needed only a hunch, not proof, to ask you to do them in the first place. When you remember that the government’s own San Diego study had more than half of sober drivers under 0.08 showing two or more walk and turn clues, and almost four in ten showing four or more clues on the eye test, a stack of weak bricks does not add up to a strong arrest. The exercises can help build probable cause, but they are a weak foundation and not proof, and the whole chain is open to a motion to suppress.

The arrest sits at the end of a chain

Probable cause is the last link in a sequence that begins with the traffic stop and the roadside detention. If the stop lacked a lawful basis, or the detention ran longer than the law allows, that can taint everything after it. The deeper Fourth Amendment issues, including the stop, reasonable suspicion, and prolonged detention, lives in the search and seizure section, and we read your case against all of it.

I take the arrest apart the same way it was built, one link at a time, and I make the State defend each one instead of waving at all of them together. I press on whether there was ever real proof or just a chain of soft factors, the odor, the nerves, and a set of exercises the science says a sober person fails all the time. I know these tests from the inside and I know the Fourth Amendment law that governs the stop, so when the arrest rests on a foundation this thin, I put every crack in it in front of the court.

Questions About Probable Cause

What does an officer need to request field sobriety exercises?

Reasonable suspicion, a lower standard than probable cause. A Florida court has held that an officer needs only reasonable suspicion of impairment to ask a driver to perform the exercises, so the request itself is rarely the strongest challenge.

How do field sobriety exercises create probable cause?

They are one input. The officer combines the driving pattern, the odor of alcohol, your statements and appearance, and the exercise clues into a totality that either does or does not reach probable cause for an arrest.

Is the odor of alcohol enough to arrest?

No. Florida courts have recognized that the odor of alcohol alone is not inconsistent with safe driving and does not by itself establish impairment. It is a factor, not a conclusion.

Can the arrest be challenged even if I did the exercises?

Yes. If the inputs were weak or the exercises were poorly administered, we can argue the officer lacked probable cause, which is litigated through a motion to suppress tied to the Fourth Amendment.

How does this connect to the stop and detention?

The arrest sits at the end of a sequence that starts with the stop and the detention. If any earlier step was unlawful, it can affect everything that followed, which is why the search-and-seizure analysis matters.

What do you look for first?

Whether each input to probable cause holds up, the basis for the stop, the length of the detention, the reliability of the clues, and whether the officer leaned on something, like odor alone, that the law says is not enough.

Related: the stop, reasonable suspicion, prolonged detention, probable cause and the affidavit, and field sobriety in your case.

Can I be arrested just for failing the field sobriety tests?

The exercises are meant to help build probable cause, not to prove it, and an officer needs only reasonable suspicion to ask you to do them. Because a large share of sober people show clues, a “failed” exercise is a weak basis for an arrest and can be challenged along with the rest of the chain.

This page is general information, not legal advice, and it does not create an attorney-client relationship. Field sobriety exercises in Florida are governed by case law including State v. Meador, 674 So. 2d 826 (Fla. 4th DCA 1996), and by section 316.193, Florida Statutes. Procedures and rules change, and every case turns on its own facts. Past results do not guarantee a similar outcome.