Marijuana Odor Alone Sustains Reasonable Suspicion to Prolong a Traffic Stop and Probable Cause to Search a Vehicle Under the Automobile Exception

1. Introduction

United States v. Jalen McIntyre (11th Cir. May 20, 2026) addresses whether officers may (1) prolong a lawful traffic stop and (2) conduct a warrantless vehicle search when they testify they smelled marijuana emanating from the driver/vehicle. The defendant, Jalen Devantae McIntyre, appealed the denial of his motion to suppress evidence supporting convictions for possession with intent to distribute a controlled substance and possession of a firearm in furtherance of a drug-trafficking crime.

The appeal focused on two Fourth Amendment questions: (a) whether the stop was unlawfully prolonged without reasonable suspicion, and (b) whether the automobile exception allowed a warrantless search without probable cause. McIntyre’s principal attack was factual: he argued the officers’ testimony about smelling marijuana was “incredible as a matter of law,” and therefore could not justify either the extended detention or the subsequent search.

2. Summary of the Opinion

The Eleventh Circuit affirmed. It held:

  • The district court did not clearly err in crediting the officers’ testimony that they smelled marijuana; the testimony was not “incredible as a matter of law.”
  • Because “the smell of marijuana alone may provide a basis for reasonable suspicion for further investigation,” the officers had reasonable suspicion to prolong the stop.
  • Under the automobile exception, once the district court credited that the officer smelled marijuana inside the vehicle, that odor alone supplied probable cause to search.
  • The panel declined the defendant’s invitation to revisit Eleventh Circuit marijuana-odor probable-cause precedent because the prior-panel-precedent rule foreclosed it absent en banc or Supreme Court abrogation.

3. Analysis

A. Precedents Cited

The opinion is anchored in established Fourth Amendment traffic-stop and automobile-search doctrine, applying several key precedents:

1) Traffic stops as Fourth Amendment seizures; scope and duration

  • United States v. Arvizu, 534 U.S. 266 (2002) — Cited for the foundational point that investigatory traffic stops are “seizures” within the meaning of the Fourth Amendment. This frames the entire inquiry as one of reasonableness.
  • United States v. Campbell, 26 F.4th 860 (11th Cir. 2022) (en banc) — Reinforces that even a lawful stop does not permit indefinite detention; officers must remain tied to the stop’s lawful mission unless new suspicion arises.
  • Rodriguez v. United States, 575 U.S. 348 (2015) — Supplies the governing “mission” principle: the acceptable duration of a stop is limited to addressing the traffic violation and related safety tasks. Any measurable extension requires independent justification (typically reasonable suspicion).
  • United States v. Vargas, 848 F.3d 971 (11th Cir. 2017) — Reiterates Rodriguez’s rule in Eleventh Circuit terms: exceeding the time needed for the traffic purpose violates the Fourth Amendment absent adequate cause.
  • United States v. Perkins, 348 F.3d 965 (11th Cir. 2003) — Provides the circuit’s formulation that a stop may be prolonged when an officer can articulate reasonable suspicion of additional illegal activity beyond the traffic offense.

2) Appellate review and credibility determinations

  • United States v. Smith, 821 F.3d 1293 (11th Cir. 2016) — Establishes the standard of review for suppression rulings: mixed questions of law and fact; legal conclusions reviewed de novo; factual findings for clear error, in the light most favorable to the prevailing party.
  • United States v. Ramirez-Chilel, 289 F.3d 744 (11th Cir. 2002) — Central to rejecting McIntyre’s “incredible as a matter of law” argument. Ramirez-Chilel limits appellate second-guessing of credibility: deference is owed unless testimony is “contrary to the laws of nature” or so implausible that no reasonable factfinder could accept it. The panel uses this to uphold the district court’s acceptance of the odor testimony (including the “whoosh” explanation when the door closed).

3) Odor of marijuana as reasonable suspicion and probable cause

  • United States v. White, 593 F.3d 1199 (11th Cir. 2010) — Directly supports the stop-prolongation holding: “the smell of marijuana alone may provide a basis for reasonable suspicion for further investigation.” This is the doctrinal bridge from odor to continued detention.
  • United States v. Harden, 104 F.4th 830 (11th Cir. 2024) — Supplies the vehicle-search holding: the “smell of marijuana alone” provides probable cause to search. The panel treats Harden as binding circuit authority that resolves the probable-cause question once odor is credited as a fact.
  • United States v. Morley, 99 F.4th 1328 (11th Cir. 2024) — Provides the modern “totality of the circumstances” articulation of probable cause: a fair probability that contraband or evidence will be found in the vehicle. The opinion then plugs marijuana odor into that standard via Harden.

4) The automobile exception framework

  • Brigham City v. Stuart, 547 U.S. 398 (2006) — Cited for the baseline rule that warrantless searches are presumptively unreasonable. It sets the stage for the court to explain why an exception (here, the automobile exception) applies.
  • United States v. Watts, 329 F.3d 1282 (11th Cir. 2003) — Provides the Eleventh Circuit’s two-element automobile exception: (1) the vehicle is readily mobile; and (2) probable cause exists. Watts also rejects the notion that officers must show exigent circumstances beyond the vehicle’s inherent mobility. This matters because defendants often argue that without additional urgency, a warrant is required.

5) Preservation/abandonment and binding precedent

  • United States v. Levy, 379 F.3d 1241 (11th Cir. 2004) — The panel applies Levy to deem abandoned an argument raised for the first time in a reply brief (McIntyre’s exigent-circumstances point as a basis for prolonging the stop).
  • United States v. Archer, 531 F.3d 1347 (11th Cir. 2008) — Invoked to enforce the prior-panel-precedent rule: later panels cannot overrule earlier panel holdings unless the Supreme Court or the Eleventh Circuit sitting en banc abrogates them. This forecloses McIntyre’s request to revisit marijuana-odor probable-cause doctrine.

B. Legal Reasoning

1) The “prolonged stop” question turns on (i) mission limits and (ii) new suspicion

The panel accepts that the initial stop was lawful and therefore begins from Rodriguez/Campbell: officers may conduct tasks tied to the traffic mission, but they may not extend the stop beyond the time reasonably required for that mission unless they develop independent reasonable suspicion. The court identifies the asserted basis for that suspicion as the odor of marijuana.

2) McIntyre’s principal challenge was credibility, not doctrine

Rather than contesting the legal rule that marijuana odor can create suspicion, McIntyre tried to remove the factual predicate: he argued the odor testimony was “incredible as a matter of law.” Using Ramirez-Chilel, the panel set a high bar for overturning the district court’s credibility findings. It concluded the testimony—Harmon’s description of a “whoosh” of odor when the door closed, corroborated in part by body-camera statements, and Brown’s claimed detection of raw marijuana odor—was not physically impossible or facially implausible. Because the appellate court must view facts in the light most favorable to the government after a suppression denial, the credibility finding held.

3) Once odor is credited, existing Eleventh Circuit law does the rest

For the stop extension, White supplies the rule: odor alone may justify reasonable suspicion for further investigation. For the search, Watts supplies the two-element automobile exception; McIntyre conceded ready mobility, leaving probable cause. Harden supplies the dispositive proposition that odor alone provides probable cause, and Morley provides the general probable-cause framing. The panel thus treats the case as largely controlled by binding precedent conditioned on the district court’s factual finding that odor was present.

4) The court also shuts the door on doctrinal reconsideration

McIntyre urged reconsideration of the marijuana-odor probable-cause rule. Archer’s prior-panel-precedent rule prevents a merits re-evaluation unless there is intervening Supreme Court authority or en banc Eleventh Circuit change. The panel found none and therefore declined the invitation.

C. Impact

Although designated “NOT FOR PUBLICATION,” the decision is significant in three practical ways within Eleventh Circuit practice:

  • Reinforcement of odor-based suspicion/searches: The opinion reaffirms the circuit’s continued acceptance—post-Rodriguez and in the modern era—of marijuana odor as sufficient, by itself, to (a) justify extending a traffic stop and (b) establish probable cause under the automobile exception.
  • Credibility as the decisive battlefield: The panel signals that when suppression hinges on whether an officer actually smelled marijuana, appellate courts will rarely disturb district-court credibility findings absent extreme implausibility. Body-camera footage that does not directly contradict the testimony may be insufficient to overcome deference.
  • Prior-panel-precedent rule as a barrier to policy-shift arguments: Even if broader legal landscapes around cannabis evolve, litigants in the Eleventh Circuit must identify intervening Supreme Court or en banc authority to dislodge White/Harden-style rules; panel courts will treat the doctrine as settled.

4. Complex Concepts Simplified

  • “Reasonable suspicion”: A specific, articulable basis to suspect criminal activity—less than probable cause. In traffic stops, it is what officers need to lawfully extend the encounter beyond the traffic mission.
  • “Probable cause”: A fair probability, based on the totality of circumstances, that evidence or contraband will be found in the place searched. It is a higher standard than reasonable suspicion.
  • “Prolonging a stop”: Adding time to a traffic stop beyond what is reasonably necessary to handle the traffic infraction and safety-related tasks. Under Rodriguez, added time must be supported by independent reasonable suspicion.
  • “Automobile exception”: A warrant exception allowing officers to search a readily mobile vehicle without a warrant if they have probable cause. Under Watts, no extra exigency beyond inherent mobility is required in the Eleventh Circuit.
  • “Incredible as a matter of law”: An appellate standard for rejecting testimony only when it is physically impossible or so implausible no reasonable factfinder could believe it. Ordinary inconsistencies typically do not qualify.
  • “Prior-panel-precedent rule”: In the Eleventh Circuit, one panel cannot overrule another. Only the Supreme Court or the Eleventh Circuit sitting en banc can do so.
  • “Abandonment” (reply-brief rule): Arguments raised for the first time in a reply brief are not considered, as reflected in Levy.

5. Conclusion

United States v. Jalen McIntyre affirms a suppression denial by treating marijuana odor testimony as a factual issue resolved by district-court credibility findings and by applying binding Eleventh Circuit precedent that marijuana odor alone can (1) create reasonable suspicion to prolong a traffic stop and (2) establish probable cause for a warrantless vehicle search under the automobile exception. The decision underscores that, in this circuit, challenges to odor-based searches will often rise or fall on the evidentiary record (including body-camera context) and the deference owed to trial-level credibility determinations—while doctrinal attacks remain constrained by the prior-panel-precedent rule.