The United States Government appeals a suppression order by the United States District Court for the District of Arizona. The court excluded evidence of marijuana found in the trunk of a car driven by Appellee Garda-Acuna from his trial for possession with intent to distribute marijuana under 21 U.S.C. § 841(a)(1) (1994). We have jurisdiction under 18 U.S.C. § 3731 (1994 & Supp. I 1995), and we reverse and remand.
I
On the day of Garcia-Acuna’s arrest, Border Patrol Agents Ortiz, Brown, and DeRose were patrolling several streets in downtown Nogales, Arizona, including East Street. East Street, which dead-ends approximately 75 to 100 feet from the international border with Mexico, was *1145 known to the agents for high levels of traffic in both illegal aliens and narcotics. The border fence near the end of East Street has “numerous holes and sections missing.” The agents’ assignment was to guard the border against illegal activity.
At the suppression hearing, the government presented the testimony of Agents DeRose and Ortiz. Both were graduates of the Border Patrol Academy and had received training in the laws pertaining to their assignments. Both had also been cross-designated by the U.S. Customs Service to enforce federal narcotics laws.
Agent Ortiz testified to observing four groups walking at different times between the international border and a certain house on East Street. The first group appeared to originate near the border and walked down East Street, but Agent Ortiz was unsure whether the group had crossed the border. Ten to fifteen minutes later, another group left the house and “jumped” the border fence into Mexico. The third group was observed jumping the border fence from Mexico into the United States and walking down East Street before disappearing near the house, and ten to fifteen minutes later, the fourth group left the house and jumped into Mexico. Agent Ortiz did not know whether any one group contained the same people as any other. Because these border crossings were illegal, Agents Ortiz and Brown searched East Street between the house and the border and discovered a burlap sack with twine and plastic bags at the end of East Street. According to Agent Ortiz’s testimony, not only is entering the United States without inspection an illegal act, but groups of people conspicuously crossing the border illegally are sometimes used, in his experience, as a diversionary tactic to permit contraband to be smuggled away from the border. Agent DeRose testified also that illegal aliens crossing the border at that point “get loaded up into vehicles and are driven north.”
A brown Ford Explorer was parked in the driveway of the house near where the groups had disappeared, and a red Camaro and a black Chevrolet Celebrity were parked across the street. Agent Ortiz testified to knowing at the time of the arrest about a prior seizure by his agency of the Explorer in connection with narcotics trafficking. He did not recognize the other’ cars and testified based on his familiarity with the neighborhood -that they did not “belong to” the area. At one time, a person opened the rear door of the Explorer, but Agent Ortiz did not see that person put anything inside. None of the agents observed anybody approaching the Cama-ro or the Celebrity.
About an hour after the agents surv-eilled the last group crossing into Mexico, the Camaro drove down East Street. Agent Brown stopped the Camaro but discovered nothing of interest. An hour later, the Explorer and the Celebrity departed at the same time, with the Explorer preceding the Celebrity down the hill for a block and a half. The Explorer then turned left while the Celebrity continued straight, 2 and Agent Brown followed the Explorer while Agent DeRose followed the Celebrity. The agents’ purpose was to look for illegal aliens.
Agent DeRose testified to following the Celebrity at the direction of Agent Ortiz, who was assigned to a van and, under Border Patrol policies, could not participate in the traffic stop. Agent DeRose checked the Celebrity’s license plate through a dispatcher in Tucson, who reported that the plate belonged to a Red Cherokee. Agent DeRose stopped the Celebrity, asked for identification, and asked permission to search the car. After discovering the marijuana and arresting Garcia-Acuna, Agent DeRose checked the li *1146 cense plate again and found that it did belong to the Celebrity. He testified this error may have been on his part or the dispatcher’s.
II
We review de novo the district court’s determination of whether reasonable suspicion existed to support an investigatory stop.
United States v. Michael R.,
III
The Fourth Amendment guards against unreasonable seizures of a person, including brief investigatory stops.
United States v. Cortez,
In our recent decision in
United States v. Ordaz,
We note one particular distinguishing feature between
Ordaz
and the instant case. In
Ordaz,
the facts giving rise to suspicion occurred just before the four vehicles left the area and were stopped.
Although
Ordaz
itself suggests the outcome of this appeal, in this case an additional factor was present. When Agent DeRose called in the Celebrity’s license plate number, the dispatcher informed him that the license plate on the Celebrity belonged to a different car. Because Agent DeRose did not have jurisdiction to enforce traffic laws, the district court discounted the fact of the mismatched plate when evaluating the agent’s reasonable suspicion. However, a mismatched plate
*1147
can add to suspicion of criminal conduct.
United States v. De Leon-Reyna,
IV
Garcia-Acuna urges us to uphold the suppression order on the alternate ground of a lack of consent to search the trunk. Because we do not have a developed record or factual findings by the district court on this issue, we decline to express an opinion on the question of consent.
Accordingly, we REVERSE the district court’s suppression order and REMAND for further proceedings consistent with this opinion.
Notes
. Agent Ortiz testified this conduct appeared to constitute "tandem driving,” where the Explorer was a "heat car” intended to attract the Border Patrol while the Celebrity escaped. The district court found the block and a half of joint travel too short to establish tandem driving. This finding is not clearly erroneous.
