## Facts

- Pennsylvania State Trooper Volk stopped Leal’s vehicle after observing window tint he believed violated the Pennsylvania Vehicle Code.
- Leal challenged the basis for the stop, claiming the tint was factory-installed and fell within a statutory exception, but Volk proceeded based on his on-scene observation that the tint appeared illegal.
- During the stop, Volk questioned Leal and requested consent to search the vehicle; Leal refused.
- Volk decided to seek a drug-sniffing dog and extended the roadside detention while waiting for a K-9 unit.
- Volk identified fourteen factors that, in his view, suggested drug trafficking. A leading factor was Leal’s statement that he had consulted a lawyer before driving from Texas.
- Leal was held at the roadside for at least about 80 minutes (described in later summaries as roughly 80–90 minutes) while waiting for another trooper to arrive with the dog; the K-9 unit was delayed by traffic.
- After the dog arrived and conducted a sniff, officers searched the vehicle and seized a controlled substance.
- Leal was prosecuted in federal court and convicted of possession with intent to distribute a controlled substance.
- Leal moved to suppress the seized drugs, arguing (1) the prolonged detention was a de facto arrest without probable cause and (2) even if treated as a Terry stop, the length of the detention was unreasonable; the district court denied the motion.
- Leal appealed the suppression ruling to the United States Court of Appeals for the Third Circuit.

## Issues

1. Whether Trooper Volk’s stop for suspected illegal window tint violated the Fourth Amendment because Leal claimed the tint fell within a statutory exception.
2. Whether detaining Leal for roughly 80–90 minutes while waiting for a delayed K-9 unit converted the encounter into a de facto arrest requiring probable cause.
3. If the detention remained an investigative stop under *Terry v. Ohio*, whether the duration and circumstances of the delay were unreasonable under the Fourth Amendment.

## Decision

- The Third Circuit affirmed the district court’s denial of Leal’s motion to suppress and affirmed the conviction.
- The court held the initial traffic stop was lawful because Volk had at least reasonable suspicion, based on his observation of heavily tinted windows, that the vehicle violated Pennsylvania law; Leal’s asserted exception did not negate the objective basis for the stop at the time it occurred.
- The court held the extended detention while awaiting the K-9 unit did not amount to a de facto arrest under the totality of the circumstances.
- The court further held that, although the wait was long and near the outer limit of a permissible investigative detention, it was not unreasonable because officers had reasonable suspicion and promptly sought the canine sniff; the delay was tied to the K-9 unit’s traffic-related lateness rather than police foot-dragging.
- Because the detention was not unconstitutional, the drug evidence discovered after the dog’s alert was not suppressed.

## Legal Principles

- A traffic stop is reasonable under the Fourth Amendment if the officer has an objective basis—at least reasonable suspicion—to believe a traffic law has been violated at the time of the stop.
- The possible existence of a statutory exception to a traffic rule does not automatically defeat reasonable suspicion when the officer’s on-scene observations reasonably suggest a violation.
- A detention becomes a de facto arrest when, considering the totality of the circumstances, police actions are so intrusive in scope or duration that probable cause is required.
- Under *Terry v. Ohio*, officers may extend a traffic stop beyond its initial mission only if they can point to specific, articulable facts supporting reasonable suspicion of other criminal activity.
- When evaluating whether a prolonged investigative detention is reasonable, courts focus on whether officers pursued the investigation in a reasonably expeditious manner and whether the delay was tied to investigative steps aimed at confirming or dispelling suspicion (such as obtaining a K-9 unit).
- A canine sniff may be used during a lawful investigative detention, but the additional time added to the stop must remain reasonable in light of the officer’s suspicion and the officer’s efforts to complete the investigation without unnecessary delay.
- If the continued detention is lawful, evidence found after a dog alert and resulting search is not excluded as the product of an unlawful seizure.

## Conclusion

In *United States v. Leal*, the Third Circuit held that the stop for suspected illegal window tint was supported by reasonable suspicion and that holding Leal for roughly 80–90 minutes to obtain a drug-sniffing dog—despite the canine unit’s traffic delay—remained an investigative detention supported by reasonable suspicion rather than a de facto arrest, so the seized drug evidence was admissible and the conviction was affirmed.


United States v. Leal, 236 Fed. Appx. 937 (2007)