delivered the opinion of the Court.
Petitioner was convicted of federal drug offenses based on evidence seized in January 1971 when Border Patrol officers stopped his camper pickup at a traffic checkpoint on California Highway 86, about 36 air miles from the Mexican border. The officers first determined that petitioner was a United States citizen, then asked him to open the camper so that they could search for concealed aliens. When petitioner opened the door, one officer noticed a strong odor of marihuana. He entered the camper and discovered approximately 356 pounds of the drug. A subsequent search of the passenger compartment produced a number of benzedrine tablets.
The Court of Appeals for the Ninth Circuit affirmed petitioner’s conviction, rejecting his argument that the search was unlawful.
The Court of Appeals reheard the case en banc and held, in a sharply divided opinion, that the principles of
Almeida-Sanchez
applied to searches conducted at traffic checkpoints as well as searches conducted by roving patrols. The Court nevertheless affirmed petitioner’s conviction, holding that
Almeida-Sanchez
would not be applied to invalidate searches that occurred prior to the date of that decision.
We hold today in United States v. Ortiz, ante, p. 891, that the Fourth Amendment, as interpreted in AlmeidaSanchez, forbids searching cars at traffic checkpoints in the absence of consent or probable cause. In this case the Government does not contend that the Highway 86 checkpoint is a functional equivalent of the border, that the officers had probable cause to open the camper, or that petitioner consented to the search. The primary question for decision is whether the principles of Almeida-Sanchez should have been applied retroactively.
In
United States
v.
Peltier, ante,
p. 531, we refused to apply
Almeida-Sanchez
to a roving-patrol search conducted before June 21, 1973, even though a direct appeal was pending on that date. We think the decision in
Peltier
is controlling here, as the reasons that dictated a holding of nonretroactivity in that case are equally applicable. At the time of our decision in
Almeida-Sanchez,
all the Courts of Appeals in Circuits adjacent to the Mexican border had held that immigration officers at traffic checkpoints could search automobiles for concealed aliens.
E. g., United States
v.
McCormick,
Petitioner further argues that even if Almeida-Sanchez *920 is not to be applied retroactively he is entitled to the benefit of the Court of Appeals’ decision that AlmeidaSanchez extended to checkpoint searches. He invokes this Court’s practice of applying new constitutional doctrine in the case that establishes the point, 2 and maintains that the Court of Appeals’ refusal to apply its extension of Almeida-Sanchez in his case made its discussion of that point mere dictum. We conclude, however, that the only error of the Court of Appeals was its reaching out to decide that Almeida-Sanchez applied to checkpoint searches in a case that did not require decision of the issue.
The Government raised two questions in the Court of Appeals: whether
Almeida-Sanchez
applied retroactively, and if it did, whether it would require probable cause for checkpoint searches. This Court consistently has declined to address unsettled questions regarding the scope of decisions establishing new constitutional doctrine in cases in which it holds those decisions nonretroactive.
E. g., Michigan
v.
Payne,
Petitioner contends, nevertheless, that once the Court of Appeals addressed the unnecessary issue it was bound to apply that ruling in his case. Because it refused to do so, petitioner says the court rendered a hypothetical decision forbidden by Art. Ill of the Constitution. It is true that this Court has suggested that Art. Ill is the primary impetus for applying new constitutional doctrines in cases that establish them for the first time.
Stovall
v.
Denno,
The judgment of the Court of Appeals is
Affirmed.
Notes
While approving checkpoint searches for aliens, the Court of Appeals for the Ninth Circuit had limited the Border Patrol’s authority to search for
contraband
at points away from the border.
E. g., Cervantes
v.
United States,
There was some ground for confusion about the state of the law in the Fifth Circuit at the time
Almeida-Sanchez
was decided. Early cases had affirmed immigration officers’ authority to search for aliens at traffic checkpoints.
E. g., Ramirez
v.
United States,
Neither of the cases suggesting that “reasonable suspicion” was required for immigration searches resulted in a decision invalidating a search, and none of the court’s opinions indicated disagreement with the earlier cases establishing an unqualified right to search for aliens at checkpoints whose location and operation were reasonable. Under these circumstances, we conclude that the Government reasonably relied on the earlier cases in continuing to make immigration searches at checkpoints.
See
Stovall
v.
Denno,
