## Facts

- Border Patrol agents staffed a permanent checkpoint on Highway 86 near El Centro, California, about fifty miles north of the U.S.–Mexico border.
- A motorist told agents that two northbound cars with Mexicali license plates had made U-turns shortly before reaching the checkpoint.
- Agents drove to the area and observed a blue Chevrolet Blazer and a red Nissan sedan (both with Mexicali plates) pull off the shoulder and then re-enter the highway heading south.
- Agents described the turnout as a known smuggling pickup/drop-off location that was not visible from the checkpoint due to an obstructed line of sight.
- The U-turns occurred after the vehicles passed a sign indicating the previously closed checkpoint had reopened.
- The agents believed the vehicles were traveling in tandem, a pattern they associated with smuggling activity.
- Agents stopped both vehicles; a search of the second vehicle uncovered marijuana and a pistol.
- Defendants moved to suppress, arguing the stop lacked reasonable suspicion and improperly relied on Hispanic appearance and other generalized factors; the district court denied suppression.

## Issues

1. Whether the stop was supported by reasonable suspicion under the Fourth Amendment based on the totality of the circumstances.
2. Whether officers may consider apparent Hispanic ethnicity as a factor in the reasonable-suspicion analysis absent a specific suspect description.
3. How courts should evaluate generalized factors such as border proximity and assertions that an area is associated with smuggling when assessing reasonable suspicion.

## Decision

- The en banc Ninth Circuit affirmed the denial of the motions to suppress and upheld the stop as supported by reasonable suspicion under the totality of the circumstances.
- The court held that race or ethnic appearance generally may not be considered in forming reasonable suspicion, except where officers rely on a specific suspect description that includes race.
- The court cautioned against giving dispositive weight to broad, generic considerations (including border proximity and generalized “high-crime area” claims), while recognizing that location-specific smuggling indicators may be relevant when tied to particular conduct.

## Legal Principles

- Reasonable suspicion requires specific, articulable facts and rational inferences that criminal activity may be afoot, assessed under the totality of the circumstances.
- Race or ethnicity is not a permissible factor in ordinary reasonable-suspicion determinations; it may be considered only when part of a specific, particularized suspect description.
- Proximity to the border and an area’s reputation for crime cannot substitute for individualized suspicion; such factors carry limited weight unless connected to concrete, case-specific observations.
- Evasive driving behavior near an operating checkpoint (including a U-turn at an obscured location), tandem driving consistent with smuggling methods, and location-specific intelligence about a particular turnout can collectively support reasonable suspicion.

## Conclusion

The en banc court upheld the stop because the agents had an objective, particularized basis to suspect smuggling based on the U-turns after notice the checkpoint was open, the obscured turnout’s smuggling use, and tandem-driving indicators, while rejecting reliance on Hispanic appearance and limiting the weight of generic border-area factors in Fourth Amendment analysis.


United States v. Montero-Camargo, 208 F.3d 1222 (9th Cir. 2000) (en banc), cert. denied, 531 U.S. 889 (2000)