Can Police Arrest You for DWI Without Probable Cause?

Pulling you over and arresting you are two different decisions, and they need two different levels of proof.

To stop you, an officer needs reasonable suspicion. To arrest you, the officer needs probable cause, which is a meaningfully higher bar.

In a lot of DWI cases the stop is fine and the arrest is not. The officer smelled alcohol, saw red eyes, and heard what they thought was slurred speech, then went straight to handcuffs. Those observations show you may have been drinking. Drinking is legal. What the officer needs is a reasonable basis to believe you had lost the normal use of your faculties, or were at 0.08 or above.

That is a different question, and it is often not answered by what is actually on the video.

What probable cause actually requires

What probable cause requires as a standard, and how Texas courts have come out on facts like odor plus an admission plus a crash, is set out on the arrest.

Two things about that definition matter to your case.

It is judged on what the officer knew at the time of the arrest. Not what turned up afterward. A breath result taken an hour later at the station cannot be used to justify an arrest decision made on the roadside. If there was not enough at the moment the handcuffs went on, a later test does not fix it.

It is judged on the whole picture, not one fact. Courts look at the totality of the circumstances rather than grading each observation on its own. That cuts both ways. The State gets to add everything together, and you get to show that the things being added up are weaker than they sound.

Reasonable suspicion is not probable cause

These get blurred constantly, including by officers testifying about them, and keeping them apart is the whole point of this page.

The two standards are set out in full on the arrest. The short version is that reasonable suspicion lets an officer stop and investigate you, and probable cause is what it takes to arrest you.

So a weaving car can justify pulling you over. Weaving does not justify arresting you for DWI. Between those two moments the officer has to develop something more, and what they developed is exactly what a challenge to the arrest examines.

If the stop itself was bad, that is a separate and usually stronger argument. See challenging the stop.

The observations officers rely on

DWI arrest reports are remarkably similar to each other. The same handful of observations appears in nearly all of them: an odor of alcohol, bloodshot or watery eyes, slurred speech, a flushed face, fumbling with your license or insurance, admitting you had been drinking, and clues on the roadside tests. What the officer was trained to watch for, phase by phase, is at what officers look for.

Read that list again and notice what it does and does not show. Most of it shows consumption, not impairment. Texas does not prohibit drinking and driving. It prohibits driving while intoxicated, which means losing the normal use of your mental or physical faculties, or being at 0.08 or above. The gap between “they had been drinking” and “they were intoxicated” is where this defense lives.

Taking the list apart

Each item has an innocent explanation, and most have a problem the officer will concede if asked properly.

The odor of alcohol. Alcohol itself has very little smell. What an officer is smelling is whatever the drink was flavored with, which tells you nothing about how much or how recently. One drink and six drinks can smell the same. The odor establishes that you drank something. Nothing more.

Bloodshot or watery eyes. Caused by allergies, smoke, contact lenses, crying, wind, a long day, and being woken up. It is also nearly universal at two in the morning, which is when most of these stops happen.

Slurred speech. This one is worth testing against the recording, because it is the observation that most often does not survive contact with the video. Speech patterns, accents, dental work, fatigue, and simple nervousness all get written down as slurring. Listen to the audio and compare it to what the report claims.

Fumbling with documents. Being pulled over by police is stressful for sober people. Officers are trained to watch for divided-attention failures, but nervousness produces the same behavior.

The roadside tests. This is usually the heaviest item on the list, and it is the most attackable. If the tests were given wrong, scored wrong, or were never valid for someone in your condition, they cannot carry the arrest decision. See challenging field sobriety tests and medical conditions that mimic intoxication.

The roadside breath device. If the officer used a handheld breath tester at the scene, its number is not admissible as evidence of your alcohol level in Texas. See why the roadside breath test isn’t evidence.

Where the report and the video disagree

This is the practical core of the argument, and it costs nothing but attention. Reports get written after the arrest, sometimes hours after, by someone who has already decided you were drunk. The video was recorded while it happened. When they disagree, the video is the evidence.

What to compare: how you actually spoke, how you actually walked getting out of the car and standing while being questioned, whether you followed multi-step instructions, what the officer counted as a clue against what that clue actually requires, and how long the whole thing took — including whether the arrest decision came before or after the tests were finished.

Video is routinely overwritten, so the request has to go in early. See police video and discovery.

Pinning down when you were arrested

An easy thing to overlook, and it decides what evidence counts.

Probable cause is measured at the moment of arrest, so somebody has to establish when that moment was. It is not always when the handcuffs appeared. You are under arrest once a reasonable person in your position would not have felt free to leave.

That moment can come earlier than the paperwork says. Being placed in the back of a patrol car, being told you are not going anywhere, or being physically restrained can all mark it.

Why it matters: anything the officer learned after that moment cannot be used to justify the decision. If the officer had already arrested you before the roadside tests, the test results cannot support the probable cause for the arrest, because they did not have them yet.

What an unlawful arrest takes with it

If the arrest was not supported by probable cause, what came out of it is subject to being thrown out.

In a DWI case that usually means:

• The breath or blood result, since you were only at the station to give it because you were arrested
• Anything you said after the arrest
• The station video and any observations from it
• Any test you agreed to after being taken into custody

The roadside observations made before the arrest generally survive, because those happened during a lawful stop. That is the main difference between beating the arrest and beating the stop. Beating the stop can take the entire case. Beating the arrest takes the chemical test and everything after it, which in most DWI cases is still the heart of the State’s evidence.

How the arrest gets challenged

By motion to suppress, heard with the jury out of the room, usually before trial. See the motion to suppress.

The burden starts on your side. You have to put on some evidence that the police did not act properly, and in a warrantless arrest, which is nearly every DWI arrest, that first step is usually straightforward. Once it is met, the State has to justify the arrest.

What the motion runs on: the video, the offense report and any probable cause affidavit read closely for conclusions rather than facts, the officer’s testimony under oath, and the timing of each step.

If the motion is denied, the argument is not finished. It becomes an argument to the jury about whether the officer’s conclusion was reasonable, which is a question jurors are perfectly equipped to answer once they have watched the same video.

And your license hearing comes first. It puts the officer under oath months before trial, and probable cause for the arrest is directly at issue there. See the ALR hearing.