Utah DUI Defense · Case Law
Recent Utah DUI Case Law
Utah DUI cases turn on constantly evolving law — how stops are made, how evidence is gathered, and how chemical tests are challenged. Below are appellate decisions that can shape the defense of a Utah DUI, organized into recent decisions from Utah’s appellate courts and the foundational authorities that continue to govern DUI litigation. Attorney Glen W. Neeley draws on these and many other authorities when building a defense.
Recent Utah Appellate Decisions (2021–2026)
State v. Speights
2021 UT 56, 497 P.3d 340
Officers responding to a disturbance touched the defendant’s vehicle — including feeling the engine compartment for heat — and used the warm engine as evidence the car had recently been driven. The Court analyzed whether physically touching the vehicle was a Fourth Amendment search, ultimately affirming on the ground that the automobile exception applied and the final touch was supported by probable cause, providing an independent source for the evidence.
Why it matters: Recognizes that an officer’s physical contact with a vehicle can be a search — sharpening challenges to how “evidence of recent operation” is obtained in actual-physical-control and no-witness-to-driving cases.
State v. Smith
513 P.3d 629 (Utah 2022)
Police found the defendant asleep in his car in a 24-hour restaurant parking lot and, when he would not leave, seized him and began a DUI investigation. The State defended the seizure under the community caretaking doctrine. The Court reversed and ordered the evidence suppressed, holding the State failed to rebut the presumption that the warrantless seizure was unreasonable — where officers are primarily investigating a possible DUI rather than genuinely rendering aid, the exception does not apply.
Why it matters: A powerful suppression tool in “sleeping it off” and parking-lot cases, where the State relies on community caretaking to justify a warrantless seizure.
State v. Malloy
2021 UT 3
In affirming a felony DUI conviction, the Court declined to suppress evidence, holding the exclusionary rule did not require suppression where officers acted in objectively reasonable reliance on then-existing Utah precedent. The Court also stepped back from broad language in its earlier State v. James decision, recognizing that who opens a vehicle’s door can bear on whether a roadside encounter is consensual or a seizure.
Why it matters: Clarifies the door-opening and consensual-encounter analysis at the vehicle, while illustrating the limits of suppression when police rely in good faith on existing law.
This recent-decisions list is a verified starting set, not an exhaustive survey of every Utah appellate DUI opinion. Additional decisions are added as they are reviewed.
Foundational DUI Case Law
Longstanding authorities — from Utah courts and the U.S. Supreme Court — that continue to govern stops, searches, chemical testing, and the admissibility of evidence in Utah DUI cases.
State v. Homan
Field sobriety tests must be administered correctly. When they are not, improperly conducted FSTs cannot reliably establish probable cause.
Salt Lake City v. Garcia
The Horizontal Gaze Nystagmus (HGN) test cannot be introduced as scientific evidence to prove a specific level of intoxication, and cannot establish an actual blood alcohol concentration.
State v. Preece
A chemical test taken within two hours of driving does not create a presumption that the driver’s alcohol level was at or above the legal limit at the time of driving. The result — and the validity of the test — can always be challenged.
Murray City v. Hall
Before a breath-test result can be used against a defendant, the State must show the Intoxilyzer was working properly — through affidavits or testimony. Without that foundation, the result is inadmissible.
Salt Lake City v. Womack
Officers must observe the subject for 15 minutes before the breath test (Utah’s “Baker” observation period). If the person burps, regurgitates, or had gum, the observation period must restart or the test’s validity is compromised.
Florida v. J.L.
A stop or seizure cannot rest on an uncorroborated anonymous tip standing alone.
Knowles v. Iowa
In a routine traffic stop, officers may not search beyond what is necessary for officer safety.
U.S. v. Lambert
A person was “seized” when agents held his driver license for roughly 20 minutes.
U.S. v. Buchanan
Defendants were “seized” when troopers separated them from their vehicle.
U.S. v. Mitchell
A defendant retains the privilege against self-incrimination through sentencing.
Facing a Utah DUI? Every Case Has Potential Defenses.
The law described above is exactly the kind of analysis Glen W. Neeley brings to every case. Call for a free, confidential consultation — available 24/7, statewide.
801-645-5008The case summaries on this page are provided for general educational purposes only and do not constitute legal advice. They are paraphrased and may omit important details, exceptions, or subsequent developments in the law. Prior results do not guarantee a similar outcome. Reading this page does not create an attorney-client relationship. For advice about a specific situation, consult a licensed attorney.