428 U.S. 543 (1976)
In 1973 and 1974, the Immigration and Naturalization Service operated permanent checkpoints on major highways leading north from the Mexican border, including one on Interstate 5 near San Clemente, California, located 66 road miles from the border, and another on U.S. Highway 77 near Sarita, Texas, about 90 miles north of Brownsville.1 At these checkpoints, Border Patrol agents stopped northbound vehicles, made brief inquiries into the citizenship and immigration status of occupants, and in some cases referred vehicles to a secondary inspection area for further questioning.2 Approximately 10 million cars passed the San Clemente checkpoint location each year, with the checkpoint in operation about 70% of the time, resulting in thousands of apprehensions of illegal aliens.3
Respondent Amado Martinez-Fuerte was stopped at the San Clemente checkpoint on November 18, 1973, while driving a vehicle with two passengers who admitted being illegal Mexican aliens after questioning in the secondary area; he was charged with illegally transporting aliens.4 On other occasions, respondents Jose Jiminez-Garcia, Raymond Guillen, and Fernando Medrano-Barragan were similarly stopped at San Clemente, leading to the discovery of illegal aliens and charges against them.5 Petitioner Rodolfo Sifuentes was stopped at the Sarita checkpoint, where agents found four illegal aliens in his vehicle after observing them slumped in the seats, resulting in his indictment on four counts of illegally transporting aliens.6
The respondents in the San Clemente cases moved to suppress evidence obtained from the stops, arguing that the checkpoint operations violated the Fourth Amendment; the district courts granted the motions.7 The Court of Appeals for the Ninth Circuit affirmed those rulings.8 In Sifuentes' case, the district court denied the suppression motion, he was convicted after trial, and the Court of Appeals for the Fifth Circuit affirmed the conviction.9 The Supreme Court granted certiorari in the consolidated cases.10
Whether stops for brief questioning at permanent immigration checkpoints on inland highways are consistent with the Fourth Amendment in the absence of individualized suspicion that a particular vehicle contains illegal aliens?11
The Fourth Amendment requires a balancing of the public interest in law enforcement against the individual's interest in privacy and personal security.12 Stops at permanent checkpoints involve only a brief detention during which occupants respond to a question or two and possibly produce a document, with no search of the vehicle or its occupants.13 The strong public interest in controlling illegal immigration, demonstrated by thousands of apprehensions, justifies the minimal intrusion even without individualized suspicion because the location is fixed and known, the stop is uniform, and the subjective intrusion is less than with roving patrols.14
Yes. The established facts show that the San Clemente checkpoint on Interstate 5 and the Sarita checkpoint on U.S. Highway 77 were permanent fixed locations where all northbound traffic was funneled through for brief citizenship inquiries, as occurred with Martinez-Fuerte on November 18, 1973, and with Sifuentes at Sarita.15 This minimal objective intrusion, limited to visual screening and short questioning without any search, is outweighed by the public interest shown by the 17,000 illegal aliens apprehended at San Clemente in 1973 alone.16 The uniform operation at a known location reduces the potential for arbitrary or frightening encounters compared to roving patrols, satisfying the Fourth Amendment balance.17
Stops for brief questioning at permanent immigration checkpoints are consistent with the Fourth Amendment in the absence of individualized suspicion.18
Related opinions on this issue
Joined by Justice Marshall
Justice Brennan dissented on the ground that the Fourth Amendment requires objective standards of individualized suspicion for any seizure.19 The checkpoint practice permits standardless stops that disproportionately burden citizens of Mexican ancestry.20 He argued that the same governmental interests invoked here had required probable cause for searches and reasonable suspicion for roving stops in prior cases.21
Dispensing with any suspicion requirement empties the reasonableness clause of meaningful content.22 Brennan concluded that the balance should still require at least reasonable suspicion for checkpoint stops to prevent arbitrary official conduct.23
Whether selective referral of motorists to a secondary inspection area at such checkpoints for further questioning is consistent with the Fourth Amendment?24
The Fourth Amendment permits selective referral to secondary inspection when the initial stop itself requires no individualized suspicion.25 The additional intrusion remains minimal.26 Officers need wide discretion to identify vehicles that may warrant further limited inquiry.27 Referrals advance Fourth Amendment interests by reducing the burden on the general motoring public while still serving the legitimate enforcement purpose.28
Yes. The established facts demonstrate that at the San Clemente checkpoint vehicles such as Martinez-Fuerte's were referred to secondary inspection for brief additional questioning about citizenship and immigration status.29 This resulted in the discovery of illegal aliens without any conventional search.30 The selective practice, even if based in part on apparent Mexican ancestry, involves only a short additional detention.31
The detention serves a routine inquiry that could not feasibly be performed on every vehicle in heavy traffic.32 The minimal added intrusion is justified by the same public interest that supports the initial stop and does not violate the Fourth Amendment.33
Selective referral of motorists to a secondary inspection area at permanent checkpoints is consistent with the Fourth Amendment.34
Related opinions on this issue
Joined by Justice Marshall
Justice Brennan dissented on the ground that selective referrals based on Mexican ancestry create a stigmatizing and discriminatory burden on lawful travelers of Mexican descent.35 The practice turns the checkpoint into a dragnet that singles out individuals without any objective justification.36 He maintained that the practice renders meaningless prior holdings that Mexican appearance alone cannot justify a stop.
The resulting humiliation and resentment cannot be dismissed as merely routine.37 Brennan emphasized that every American citizen of Mexican ancestry travels these highways at the risk of being singled out for detention and interrogation solely because of ancestry.38 This deep resentment arises from a sense of unfair discrimination that the majority wrongly minimizes.39
Whether routine stops at permanent checkpoints require advance judicial authorization by warrant?40
The Fourth Amendment does not require a judicial warrant for routine stops at permanent checkpoints.41 The visible manifestations of authority at a fixed location provide the same assurances of regularity that a warrant would supply in other contexts.42 The reasonableness of the practice turns on factors such as location and method of operation that are open to post-stop judicial review.43
No. The established facts show that the San Clemente checkpoint operated under a magistrate's warrant of inspection while the Sarita checkpoint operated without one, yet both employed the same routine brief questioning of all northbound traffic.44 The visible signs, cones, lights, and uniformed agents at these fixed locations supply the necessary notice and limitation on discretion, rendering a warrant unnecessary while still allowing review of the checkpoint's location and operation after any stop.45
Routine stops at permanent checkpoints do not require advance judicial authorization by warrant.46