By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist
You didn’t drive anywhere. You pulled into a parking lot, or you never left the spot where you were parked. The car may have been running. You may have been asleep. But you didn’t drive.
Can you still be convicted of DWI in Texas?
The answer, depending on the specific facts, is yes. Understanding why requires understanding one of the most important and consistently misunderstood legal concepts in Texas DWI law: what the word “operating” actually means under Texas Penal Code §49.04.
"Deandra Grant Law – Criminal & DWI Defense handled my case with diligence and professionalism. Deandra Grant's reputation is stellar and now I know why. She has a team of individuals who provide quality service."
- N. Coulter
"Deandra Grant Law – Criminal & DWI Defense fights hard for their clients and is always willing to go above and beyond. They are the best firm for DWI cases in DFW and beyond. Definitely hire them to represent you in any pending cases."
- P. Williams
"Deandra Grant made a tough situation so much better. She listened to my concerns and helped me so much with my case. I would recommend her to anyone needing legal services."
- M. Haley
The Legislature Chose “Operating” — Not “Driving” — Deliberately
Texas Penal Code §49.04 does not say “driving while intoxicated.” It says operating a motor vehicle in a public place while intoxicated. That word choice is not an accident. The Legislature could have used “driving.” It didn’t. And the Texas Court of Criminal Appeals has repeatedly held that the distinction matters.
As the Court put it in the foundational 1995 case Denton v. State: “while driving does involve operation, operation does not necessarily involve driving.”
But here’s where it gets complicated: the Legislature did not define what “operating” means in the Penal Code. No statutory definition. That gap has been filled over decades by Texas appellate courts applying a fact-specific, case-by-case standard that leaves considerable room for both prosecution and defense arguments.
The Denton Standard: Totality of the Circumstances
Denton v. State, 911 S.W.2d 388 (Tex. Crim. App. 1995), is the controlling authority on what “operating” means in Texas DWI law. In Denton, the defendant was found in a vehicle that was running but couldn’t move because the engine needed time to warm up. The Court of Criminal Appeals established the standard that has governed every operating-element case since:
A person “operates” a vehicle when the totality of the circumstances demonstrates that the defendant took action to affect the functioning of his vehicle in a manner that would enable the vehicle’s use.
This is the standard Texas courts apply. Unpacked, it has several critical components worth examining separately.
“Totality of the circumstances” means no single fact is determinative. Courts look at everything: where the keys are, whether the engine is running, what gear the vehicle is in, where the defendant is seated, what the vehicle’s condition is, and what the surrounding circumstances suggest about how it got there.
“Took action” means something had to actually happen. The defendant must have done something. Passive presence in a vehicle is not, by itself, operation. But the action required is modest — courts have found operation based on starting an engine, shifting gears, pressing the brake, even releasing a parking brake.
“To affect the functioning of his vehicle” means the action has to be connected to how the vehicle works and not just any action taken while inside it.
“In a manner that would enable the vehicle’s use” means the action has to be oriented toward making the vehicle usable for transportation. Courts have specifically held that using a vehicle as a place to sleep, stay warm, or shelter from weather is an unintended use and evidence that the defendant intended only those purposes, rather than transportation, can support a defense argument that no operation occurred.
What the Case Law Actually Shows
The most instructive way to understand where the line is drawn is to look at what Texas courts have (and haven’t) found sufficient to establish operation.
Found sufficient:
In Barton v. State, 882 S.W.2d 456 (Tex. App.—Dallas 1994), the defendant was found asleep behind the wheel of an idling vehicle with the transmission in neutral. The court upheld a DWI conviction. The combination of engine running, seating position, and neutral gear (suggesting the vehicle had been driven and shifted) supported the operation finding.
In Dornbusch v. State, 262 S.W.3d 432 (Tex. App.—Fort Worth 2008), a defendant was found asleep in the driver’s seat of an idling vehicle parked in a parking lot. Conviction upheld. Engine running plus driver’s seat position plus additional circumstantial facts about how the car arrived there were sufficient.
In Murray v. State (Tex. Crim. App. 2015), the Court of Criminal Appeals reversed a court of appeals that had granted an acquittal. Murray was passed out behind the wheel of a running truck. The CCA held a jury could rationally find operation from the totality of those circumstances. The truck was running. Murray was alone. He was in the driver’s seat. No one else could have put him there. A reasonable jury could infer he had driven it.
The critical limiting principle:
No published Texas case stands for the proposition that simply being inside a running vehicle is, alone, sufficient to establish operation. The courts have consistently required at least one additional “operation fact” beyond mere presence in a running vehicle (I.e. something that connects the defendant to the vehicle having been used or being capable of being used for transportation).
The Murray dissent made this point explicitly: operating a vehicle requires evidence that the defendant took action to enable the vehicle’s use, and there needs to be evidence that the action occurred while the defendant was intoxicated. Without that connection, the element fails.
The Temporal Link Requirement
Kuciemba v. State, 310 S.W.3d 460 (Tex. Crim. App. 2010), established another important limiting principle that is frequently overlooked: there must be a temporal link between the defendant’s intoxication and the operation of the vehicle.
This matters most in cases where a defendant is found in a parked vehicle and there is no direct evidence of when or how they drove there. If the State can prove the person was operating the vehicle and intoxicated at the same moment (or that the intoxication existed at the time of operation) the element is satisfied. But if the State can only show the person is intoxicated now and the vehicle is here, without connecting those facts in time, the temporal link is missing.
This is the argument that comes into play when a defendant claims they drove to a location while sober and only became intoxicated afterward (ex. parked legally, then drank). It is a difficult argument to establish, but it is a legally cognizable defense when the facts support it.
The Factors That Matter for Defense
In any case where the operation element is genuinely in dispute, the following factual questions drive the analysis:
Key location. Keys in the ignition strongly support operation. Keys in a pocket, on the floor, or outside the vehicle weaken the State’s case significantly. In some cases, defendants who hand their keys to a passenger or place them somewhere inaccessible before sleeping can defeat an operation finding.
Engine status. Engine running is an operation fact, but not a dispositive one. An engine that was running for air conditioning or heat, with no evidence the vehicle had been driven, is weaker evidence than an engine running with the vehicle in gear and the brake engaged.
Gear and brake position. A vehicle found in drive with the brake pressed (suggesting the driver stopped the vehicle from moving) is stronger evidence of recent operation than a vehicle in park.
Seating position. Driver’s seat is an operation fact. Passenger seat, back seat, or an unusual sleeping position that suggests the person climbed in from outside the driver’s door supports an inference that they entered from outside rather than having driven there.
Vehicle location. A vehicle parked in a travel lane, at an intersection, or in an unusual position suggests it was recently driven to that spot. A vehicle parked in a legal parking space with no evidence of unusual placement is more consistent with a long-term parked vehicle.
Circumstantial evidence of recent driving. Warm engine, still-engaged safety systems, the defendant’s account of where they came from, witnesses who saw the vehicle in motion. All of these speak to whether operation occurred and when.
Case Results
Why This Matters for Your Defense
The operation element is the most commonly overlooked challenge point in Texas DWI cases where the defendant was found parked or stationary. Many defendants assume that because the car was running and the defendant was in the driver’s seat, operation is established and the only fight is about intoxication.
That assumption is wrong. The operation element is a separate, contested legal question with its own case law, its own standard, and its own factual analysis. It can be challenged through a motion to suppress (if the initial contact with law enforcement was based on an allegation of driving that cannot be proven), through a motion for directed verdict at trial, or through sufficiency of the evidence arguments on appeal.
The totality of the circumstances is exactly that — a totality. One fact rarely determines the outcome. The defense job is to identify every fact that cuts against an operation finding and present it systematically, because the prosecution has to prove every element beyond a reasonable doubt including this one.
Speak With Deandra Grant Law
If you were arrested for DWI while parked or stationary in Texas, the circumstances of how law enforcement found you, what the vehicle was doing, and what evidence exists about when or how you drove (if you drove at all) are all critical facts that need to be examined by experienced DWI defense counsel immediately.
Deandra Grant Law brings more than 30 years of DWI defense experience and more than 500 trials to every case, along with the forensic science credentials that allow challenges every element of the State’s case, including the technical question of what the vehicle’s mechanical state tells us about whether operation occurred.
Call (214) 225-7117 or visit texasdwisite.com to schedule a confidential consultation.
Firm Accolades
Better Business Bureaus
D Magazine
