Understanding Probable Cause in Arkansas Traffic Stops

Many Arkansas criminal cases begin with a traffic stop. Whether the officer had the legal right to stop you — and what they did after the stop — often determines whether the evidence can be used in court. If the stop was unlawful, or if it was unlawfully prolonged, the rest of the case may fall apart.

Here’s what you need to know about how reasonable suspicion and probable cause work in Arkansas traffic stops — and where most stops go wrong.

Reasonable Suspicion vs. Probable Cause

Both standards involve specific, articulable facts — not hunches, not “gut feelings.” But they apply at different stages of the encounter:

Standard	When It Applies	What It Requires
Reasonable Suspicion	Stopping the vehicle; brief investigatory detention	Specific, articulable facts suggesting a violation or crime
Probable Cause	Searching the vehicle (without consent), arresting the driver, or seizing evidence	Facts sufficient for a reasonable person to believe a crime has been or is being committed

Officers regularly try to stretch the lower “reasonable suspicion” standard into a probable cause justification — particularly when they want to search a car or arrest a driver. Recognizing where one standard ends and the other begins is a major source of suppression motions.

1. Officers Must Have a Valid Reason for the Stop

Police need reasonable suspicion to stop a vehicle. This means specific facts must suggest either a traffic violation or criminal activity. A hunch or vague suspicion is not enough.

A stop may be unlawful if:

• The officer misinterpreted the traffic law
• The claimed reason is not supported by the evidence (no body-cam footage of the alleged violation, for instance)
• The justification was fabricated or exaggerated
• The stop was a pretext without a genuine traffic basis
• The officer claimed a violation that doesn’t actually exist under Arkansas law

If the stop wasn’t lawful, anything discovered afterward — drugs, guns, statements, test results — can potentially be suppressed under the “fruit of the poisonous tree” doctrine.

What Doesn’t Justify a Stop

Arkansas courts have rejected stops based purely on:

• Weaving within a single lane
• Driving late at night in a “high-crime area”
• Out-of-state plates
• Briefly turning into a business or driveway
• Looking nervous when seeing a patrol car
• An officer’s “training and experience” without specific facts

2. A Traffic Stop Does Not Automatically Allow a Search

Even if the stop itself is legal, an officer cannot search your vehicle without probable cause or voluntary consent. Probable cause must come from clear facts that indicate a crime is occurring.

Probable cause may exist if:

• Contraband is in plain view
• The officer detects a strong odor of an illegal substance
• The driver shows unmistakable signs of impairment
• A trained drug dog alerts on the vehicle
• The driver makes incriminating statements

What does not create probable cause:

• Nervousness
• Refusing to consent to a search
• Refusing to answer questions
• Out-of-state plates or rental vehicles
• Multiple air fresheners
• “Inconsistent” travel stories that aren’t actually inconsistent

3. The Marijuana Odor Issue

Under Arkansas Supreme Court precedent — including Brunson v. State and McDaniel v. State — the odor of marijuana from a vehicle can establish probable cause for a warrantless search. This rule remains in effect today, even with the legalization of hemp and CBD.

That doesn’t mean every claimed odor is unchallengeable. The strongest attacks on odor-based probable cause are factual rather than doctrinal:

• Body-cam evidence contradicting the officer’s claim of a strong odor
• Conflicting officer testimony — when one officer claims to smell marijuana and another doesn’t (this was the issue in McDaniel)
• Disputes about whether the odor was specific, persistent, or strong enough
• Whether legal hemp or CBD could account for the claimed smell
• Whether the officer was actually positioned to smell what they claimed

Some other states have ruled that marijuana odor alone no longer creates probable cause given changes in cannabis law — but Arkansas has not adopted that rule. The challenge in Arkansas has to be built on the specific facts of the stop, not on doctrinal arguments about hemp legalization.

4. A Stop Cannot Be Unreasonably Extended

Under Rodriguez v. United States, a traffic stop must last only as long as necessary to handle the traffic matter. Officers cannot prolong the stop to investigate unrelated issues unless new reasonable suspicion develops during the stop.

Once the officer completes the “mission” of the stop — verifying license, registration, insurance, and issuing a warning or citation — the driver must be released unless new reasonable suspicion has arisen.

Examples of unlawful extensions include:

• Waiting for a drug dog without independent justification
• Asking unrelated questions after the warning is written
• Slow-walking paperwork to “buy time”
• Calling for backup not needed for the traffic matter
• Running additional database checks unrelated to the stop

If a stop is extended illegally, any evidence found afterward may be suppressed — even if the officer eventually develops what would otherwise be probable cause. The illegal extension itself taints what follows.

5. Common Probable Cause Problems in Arkansas Courts

Arkansas judges regularly suppress evidence when officers fail to meet the proper legal standards. Common issues that surface in suppression motions include:

These problems often lead courts to exclude the evidence entirely — and when the evidence is the foundation of the State’s case (drugs in the car, a gun in the trunk, a BAC reading), exclusion frequently means dismissal.

What to Do If You Were Stopped

• Preserve your memory of the stop. Write down what was said, what was searched, where things were found, and how long the stop lasted. Memory fades quickly.
• Don’t argue with the officer at the scene. The fight against an unlawful stop happens in court, not on the side of the road.
• Don’t consent to searches — but if you’ve already consented, your attorney can still potentially challenge whether the consent was truly voluntary.
• Get the body-cam footage requested early. Some agencies have short retention windows. Your attorney can issue preservation requests.
• Talk to a defense attorney before deciding what to do. A motion to suppress filed early in the case has more impact than one filed late.

The Bottom Line

The legal standards for stopping you, searching your vehicle, and arresting you are different — and officers regularly stretch them. A strong probable cause challenge can change the outcome of an entire criminal case, particularly in drug, gun, and DWI prosecutions where the evidence the State relies on came directly from the stop.

If your case began with a traffic stop, the legality of that stop should be the first thing reviewed — not the last.

This post is provided for general informational purposes only and does not constitute legal advice. Reading this content does not create an attorney-client relationship with Wesley Rhodes, Attorney at Law. Laws and procedures change; the information above reflects Arkansas law as of the date of publication. If you need legal advice about your specific situation, consult a qualified criminal defense attorney promptly.