Whether Border Patrol officers may search a private vehicle at an inland traffic checkpoint without consent or probable cause that the vehicle contains concealed aliens.
Holding
No. At a checkpoint removed from the border and its functional equivalents, officers may not search a private vehicle without consent or probable cause.
Reasoning
Almeida-Sanchez had held that the Government's strong interest in immigration enforcement and the practical difficulty of policing the border did not eliminate the warrant and probable-cause requirements for roving-patrol vehicle searches. Although that case did not decide the rule for fixed checkpoints, the Fourth Amendment's central concern remains protection against arbitrary and oppressive governmental intrusions.
A fixed checkpoint differs materially from a roving patrol when assessing a stop. Its location is selected by supervisory officials, its operation is visible and regular, and motorists can see official signs, uniforms, and other vehicles being processed. These features make a brief checkpoint stop less startling and less intrusive than a stop by a roving patrol on an isolated road.
Those differences do not substantially lessen the separate privacy invasion caused by a vehicle search. A motorist whose trunk or other concealed areas are searched is not meaningfully reassured merely because the search occurs at an established checkpoint. Indeed, a motorist singled out from the many cars passing through may find the search particularly intrusive.
The checkpoint also did not meaningfully confine the discretion to decide which cars would be searched. At San Clemente, only about 3% of passing cars were stopped for questioning or search, and fewer than 3% of vehicles systemwide were searched. Without a requirement that an officer justify the selection of a particular car, the Government's position would effectively permit random searches.
Probable cause is the minimum constitutional safeguard ordinarily required for a lawful automobile search. Officers may consider such facts as the occupants' conduct, responses to questioning, the vehicle's characteristics, and signs that it is heavily loaded, while drawing on their experience with alien smuggling. But the officers identified no special facts supporting probable cause to search Ortiz's car, so the search was invalid.